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4489 Dracius

January 01, 1970

4489 Dracius, (prov. designation: 1988 AK), is a large Jupiter trojan from the Greek camp, approximately 90 kilometers (56 miles) in diameter. It was discovered on 15 January 1988, by American astronomer Edward Bowell at the Anderson Mesa Station of the Lowell Observatory near Flagstaff, Arizona, in the United States.[1] The dark D-type asteroid belongs to the 50 largest Jupiter trojans and has a rotation period of 12.58 hours.[4] It was named after Dracius from Greek mythology, who was a commander of the Epeans who fought against Hector.[2]

4489 Dracius
Shape model of Dracius from its lightcurve
Discovery [1]
Discovered byE. Bowell
Discovery siteLowell Obs.
Discovery date15 January 1988
Designations
(4489) Dracius
Named after
Dracius
(Greek mythology)[2]
1988 AK · 1980 KA1
1989 AQ1
Jupiter trojan [1][3][4]
Greek [5][6] · background [6]
AdjectivesDracian
Orbital characteristics [3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc37.94 yr (13,857 d)
Aphelion5.5196 AU
Perihelion4.9173 AU
5.2184 AU
Eccentricity0.0577
11.92 yr (4,354 d)
174.79°
0° 4m 57.72s / day
Inclination22.224°
86.540°
6.5830°
Jupiter MOID0.1975 AU
TJupiter2.8480
Physical characteristics
Mean diameter
76.60±0.41 km[7]
92.93±7.4 km[8]
95.02±2.47 km[9]
12.580±0.001 h[10][a]
12.58±0.1 h[11]
12.582±0.001 h[12][a]
12.582±0.004 h[13]
0.050±0.003[9]
0.0514±0.009[8]
0.069±0.005[7]
D (SDSS-MOC)[14]
D (S3OS2)[15]
D (Pan-STARRS)[4][16]
V–I = 0.950±0.037[4]
9.00[1][3][4][9]
9.1[7]
9.12±0.22[16]

Orbit and classification edit

Dracius is a dark Jovian asteroid orbiting in the leading Greek camp at Jupiter's L4 Lagrangian point, 60° ahead of its orbit in a 1:1 resonance (see Trojans in astronomy). It is a non-family asteroid in the Jovian background population.[6][17] It orbits the Sun at a distance of 4.9–5.5 AU once every 11 years and 11 months (4,354 days; semi-major axis of 5.22 AU). Its orbit has an eccentricity of 0.06 and an inclination of 22° with respect to the ecliptic.[3]

The body's observation arc begins with its first observation as 1980 KA1 at Crimea–Nauchnij in May 1980, almost 8 years prior to its official discovery observation at Anderson Mesa.[1]

Numbering and naming edit

This minor planet was numbered on 8 June 1990 (M.P.C. 16414).[18] As of 2018, it had not been named.[1] On 14 May 2021, the object was named by the Working Group for Small Bodies Nomenclature (WGSBN), after Dracius from Greek mythology, who was a commander of the Epeans of Elis, who defended the Argive ships from Hector's attack during the Trojan War.[2]

Before Dracius was named, it belonged to a small group of only 8 unnamed minor planets with a designated number smaller than 5000. (All of them are Jupiter trojans or near-Earth asteroids). Since then, several have been named :

Physical characteristics edit

In the SDSS-based taxonomy, as well as in both the Tholen- and SMASS-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2), Dracius is a dark D-type asteroid.[14][17][15] It has also been characterized as a D-type by Pan-STARRS' survey.[4][16]

On 18 December 2012, 1988 AK has occulted the star TYC 2467-00054-1 over parts of the United States. The asteroid's brightness was measured at 16.1 and that of the star at 11.1 magnitude.[19]

Rotation period edit

Since 1992, several rotational lightcurves of Dracius have been obtained from photometric observations by Stefano Mottola, as well as Daniel Coley and Robert Stephens at the Center for Solar System Studies, California, in collaboration with Linda French and Brian Warner. Lightcurve analysis gave a well-defined rotation period of 12.582 hours with a consolidated brightness amplitude between 0.20 and 0.26 magnitude (U=3/3).[4][10][11][12][13][a]

Diameter and albedo edit

According to the surveys carried out by the Japanese Akari satellite, the Infrared Astronomical Satellite IRAS, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Dracius measures between 76.60 and 95.02 kilometers in diameter and its surface has an albedo between 0.050 and 0.069.[7][8][9]

The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0514 and a diameter of 92.93 kilometers based on an absolute magnitude of 9.0.[4]

100+ largest Jupiter trojans
Largest Jupiter Trojans by survey(A)
(mean-diameter in kilometers; YoD: Year of Discovery)
Designation H WISE IRAS Akari Ln RP V–I YoD Ref
624 Hektor 7.2 225 233 230.99 L4 6.92 0.930 1907 list
617 Patroclus 8.19 140.362 140.92 140.85 L5 102.80 0.830 1906 list
911 Agamemnon 7.89 131.038 166.66 185.30 L4 6.59 0.980 1919 list
588 Achilles 8.67 130.099 135.47 133.22 L4 7.31 0.940 1906 list
3451 Mentor 8.4 126.288 116.30 117.91 L5 7.70 0.770 1984 list
3317 Paris 8.3 118.790 116.26 120.45 L5 7.09 0.950 1984 list
1867 Deiphobus 8.3 118.220 122.67 131.31 L5 58.66 0.930 1971 list
1172 Äneas 8.33 118.020 142.82 148.66 L5 8.71 0.950 1930 list
1437 Diomedes 8.3 117.786 164.31 172.60 L4 24.49 0.810 1937 list
1143 Odysseus 7.93 114.624 125.64 130.81 L4 10.11 0.860 1930 list
2241 Alcathous 8.64 113.682 114.63 118.87 L5 7.69 0.940 1979 list
659 Nestor 8.99 112.320 108.87 107.06 L4 15.98 0.790 1908 list
3793 Leonteus 8.7 112.046 86.26 87.58 L4 5.62 0.780 1985 list
3063 Makhaon 8.4 111.655 116.14 114.34 L4 8.64 0.830 1983 list
1583 Antilochus 8.6 108.842 101.62 111.69 L4 31.54 0.950 1950 list
884 Priamus 8.81 101.093 96.29 119.99 L5 6.86 0.900 1917 list
1208 Troilus 8.99 100.477 103.34 111.36 L5 56.17 0.740 1931 list
1173 Anchises 8.89 99.549 126.27 120.49 L5 11.60 0.780 1930 list
2207 Antenor 8.89 97.658 85.11 91.32 L5 7.97 0.950 1977 list
2363 Cebriones 9.11 95.976 81.84 84.61 L5 20.05 0.910 1977 list
4063 Euforbo 8.7 95.619 102.46 106.38 L4 8.85 0.950 1989 list
2357 Phereclos 8.94 94.625 94.90 98.45 L5 14.39 0.960 1981 list
4709 Ennomos 8.5 91.433 80.85 80.03 L5 12.28 0.690 1988 list
2797 Teucer 8.7 89.430 111.14 113.99 L4 10.15 0.920 1981 list
2920 Automedon 8.8 88.574 111.01 113.11 L4 10.21 0.950 1981 list
15436 Dexius 9.1 87.646 85.71 78.63 L4 8.97 0.870 1998 list
3596 Meriones 9.2 87.380 75.09 73.28 L4 12.96 0.830 1985 list
2893 Peiroos 9.23 86.884 87.46 86.76 L5 8.96 0.950 1975 list
4086 Podalirius 9.1 85.495 86.89 85.98 L4 10.43 0.870 1985 list
4060 Deipylos 9.3 84.043 79.21 86.79 L4 9.30 0.760 1987 list
1404 Ajax 9.3 83.990 81.69 96.34 L4 29.38 0.960 1936 list
4348 Poulydamas 9.5 82.032 70.08 87.51 L5 9.91 0.840 1988 list
5144 Achates 9.0 80.958 91.91 89.85 L5 5.96 0.920 1991 list
4833 Meges 8.9 80.165 87.33 89.39 L4 14.25 0.940 1989 list
2223 Sarpedon 9.41 77.480 94.63 108.21 L5 22.74 0.880 1977 list
4489 Dracius 9.0 76.595 92.93 95.02 L4 12.58 0.950 1988 list
2260 Neoptolemus 9.31 76.435 71.65 81.28 L4 8.18 0.950 1975 list
5254 Ulysses 9.2 76.147 78.34 80.00 L4 28.72 0.970 1986 list
3708 Socus 9.3 75.661 79.59 76.75 L5 6.55 0.980 1974 list
2674 Pandarus 9.1 74.267 98.10 101.72 L5 8.48 1.000 1982 list
3564 Talthybius 9.4 73.730 68.92 74.11 L4 40.59 0.900 1985 list
4834 Thoas 9.1 72.331 86.82 96.21 L4 18.19 0.950 1989 list
7641 Cteatus 9.4 71.839 68.97 75.28 L4 27.77 0.980 1986 list
3540 Protesilaos 9.3 70.225 76.84 87.66 L4 8.95 0.940 1973 list
11395 Iphinous 9.8 68.977 64.71 67.78 L4 17.38 – 1998 list
4035 Thestor 9.6 68.733 68.23 66.99 L4 13.47 0.970 1986 list
5264 Telephus 9.4 68.472 73.26 81.38 L4 9.53 0.970 1991 list
1868 Thersites 9.5 68.163 70.08 78.89 L4 10.48 0.960 1960 list
9799 Thronium 9.6 68.033 64.87 72.42 L4 21.52 0.910 1996 list
4068 Menestheus 9.5 67.625 62.37 68.46 L4 14.40 0.950 1973 list
23135 Pheidas 9.9 66.230 58.29 68.50 L4 8.69 0.860 2000 list
2456 Palamedes 9.3 65.916 91.66 99.60 L4 7.24 0.920 1966 list
3709 Polypoites 9.1 65.297 99.09 85.23 L4 10.04 1.000 1985 list
1749 Telamon 9.5 64.898 81.06 69.14 L4 16.98 0.970 1949 list
3548 Eurybates 9.6 63.885 72.14 68.40 L4 8.71 0.730 1973 list
4543 Phoinix 9.7 63.836 62.79 69.54 L4 38.87 1.200 1989 list
12444 Prothoon 9.8 63.835 64.31 62.41 L5 15.82 – 1996 list
4836 Medon 9.5 63.277 67.73 78.70 L4 9.82 0.920 1989 list
16070 Charops 9.7 63.191 64.13 68.98 L5 20.24 0.960 1999 list
15440 Eioneus 9.6 62.519 66.48 71.88 L4 21.43 0.970 1998 list
4715 Medesicaste 9.7 62.097 63.91 65.93 L5 8.81 0.850 1989 list
34746 Thoon 9.8 61.684 60.51 63.63 L5 19.63 0.950 2001 list
38050 Bias 9.8 61.603 61.04 50.44 L4 18.85 0.990 1998 list
5130 Ilioneus 9.7 60.711 59.40 52.49 L5 14.77 0.960 1989 list
5027 Androgeos 9.6 59.786 57.86 n.a. L4 11.38 0.910 1988 list
6090 Aulis 9.4 59.568 74.53 81.92 L4 18.48 0.980 1989 list
5648 Axius 9.7 59.295 63.91 n.a. L5 37.56 0.900 1990 list
7119 Hiera 9.7 59.150 76.40 77.29 L4 400 0.950 1989 list
4805 Asteropaios 10.0 57.647 53.16 43.44 L5 12.37 – 1990 list
16974 Iphthime 9.8 57.341 55.43 57.15 L4 78.9 0.960 1998 list
4867 Polites 9.8 57.251 58.29 64.29 L5 11.24 1.010 1989 list
2895 Memnon 10.0 56.706 55.67 n.a. L5 7.50 0.710 1981 list
4708 Polydoros 9.9 54.964 55.67 n.a. L5 7.52 0.960 1988 list
(21601) 1998 XO89 10.0 54.909 55.67 56.08 L4 12.65 0.970 1998 list
12929 Periboea 9.9 54.077 61.04 55.34 L5 9.27 0.880 1999 list
17492 Hippasos 10.0 53.975 55.67 n.a. L5 17.75 – 1991 list
5652 Amphimachus 10.1 53.921 53.16 52.48 L4 8.37 1.050 1992 list
2759 Idomeneus 9.9 53.676 61.01 52.55 L4 32.38 0.910 1980 list
5258 Rhoeo 10.2 53.275 50.77 n.a. L4 19.85 1.010 1989 list
(12126) 1999 RM11 10.1 53.202 n.a. n.a. L5 n.a. ? 1999 list
(15502) 1999 NV27 10.0 53.100 55.67 50.86 L5 15.13 0.875 1999 list
4754 Panthoos 10.0 53.025 53.15 56.96 L5 27.68 – 1977 list
4832 Palinurus 10.0 52.058 53.16 n.a. L5 5.32 1.000 1988 list
5126 Achaemenides 10.5 51.922 44.22 48.57 L4 53.02 – 1989 list
3240 Laocoon 10.2 51.695 50.77 n.a. L5 11.31 0.880 1978 list
4902 Thessandrus 9.8 51.263 61.04 71.79 L4 738 0.960 1989 list
11552 Boucolion 10.1 51.136 53.16 53.91 L5 32.44 – 1993 list
(20729) 1999 XS143 10.4 50.961 46.30 n.a. L4 5.72 1.000 1999 list
6545 Leitus 10.1 50.951 53.16 n.a. L4 16.26 0.910 1986 list
4792 Lykaon 10.1 50.870 53.16 n.a. L5 40.09 0.960 1988 list
21900 Orus 10.0 50.810 55.67 53.87 L4 13.45 0.950 1999 list
1873 Agenor 10.1 50.799 53.76 54.38 L5 20.60 – 1971 list
5028 Halaesus 10.2 50.770 50.77 n.a. L4 24.94 0.900 1988 list
2146 Stentor 9.9 50.755 58.29 n.a. L4 16.40 – 1976 list
4722 Agelaos 10.0 50.378 53.16 59.47 L5 18.44 0.910 1977 list
5284 Orsilocus 10.1 50.159 53.16 n.a. L4 10.31 0.970 1989 list
11509 Thersilochos 10.1 49.960 53.16 56.23 L5 17.37 – 1990 list
5285 Krethon 10.1 49.606 58.53 52.61 L4 12.04 1.090 1989 list
4791 Iphidamas 10.1 49.528 57.85 59.96 L5 9.70 1.030 1988 list
9023 Mnesthus 10.1 49.151 50.77 60.80 L5 30.66 – 1988 list
5283 Pyrrhus 9.7 48.356 64.58 69.93 L4 7.32 0.950 1989 list
4946 Askalaphus 10.2 48.209 52.71 66.10 L4 22.73 0.940 1988 list
(22149) 2000 WD49 10.2 48.190 50.77 50.37 L4 7.84 1.090 2000 list
(32496) 2000 WX182 10.2 48.017 50.77 51.63 L5 23.34 0.950 2000 list
5120 Bitias 10.2 47.987 50.77 n.a. L5 15.21 0.780 1988 list
12714 Alkimos 10.1 47.819 61.04 54.62 L4 28.48 – 1991 list
7352 Hypsenor 9.9 47.731 55.67 47.07 L5 648 0.850 1994 list
1870 Glaukos 10.6 47.649 42.23 n.a. L5 5.99 — 1971 list
4138 Kalchas 10.1 46.462 53.16 61.04 L4 29.2 0.810 1973 list
(23958) 1998 VD30 10.2 46.001 50.77 47.91 L4 562 0.990 1998 list
4828 Misenus 10.4 45.954 46.30 43.22 L5 12.87 0.920 1988 list
4057 Demophon 10.1 45.683 53.16 n.a. L4 29.82 1.060 1985 list
4501 Eurypylos 10.4 45.524 46.30 n.a. L4 6.05 – 1989 list
4007 Euryalos 10.3 45.515 48.48 53.89 L4 6.39 – 1973 list
5259 Epeigeus 10.3 44.741 42.59 44.42 L4 18.42 – 1989 list
30705 Idaios 10.4 44.546 46.30 n.a. L5 15.74 – 1977 list
16560 Daitor 10.7 43.861 51.42 43.38 L5 – – 1991 list
(15977) 1998 MA11 10.4 43.530 46.30 51.53 L5 250 0.906 1998 list
7543 Prylis 10.6 42.893 42.23 n.a. L4 17.80 – 1973 list
4827 Dares 10.5 42.770 44.22 n.a. L5 19.00 – 1988 list
1647 Menelaus 10.5 42.716 44.22 n.a. L4 17.74 0.866 1957 list
(A) Used sources: WISE/NEOWISE catalog (NEOWISE_DIAM_V1 PDS, Grav, 2012); IRAS data (SIMPS v.6 catalog); and Akari catalog (Usui, 2011); RP: rotation period and V–I (color index) taken from the LCDB

Note: missing data was completed with figures from the JPL SBDB (query) and from the LCDB (query form) for the WISE/NEOWISE and SIMPS catalogs, respectively. These figures are given in italics. Also, listing is incomplete above #100.

Notes edit

  1. ^ a b c Lightcurve plots of (4489) 1988 AK (4489 Dracius) from March 2015 and April 2016 by Daniel Coley and Robert Stephens at the Center for Solar System Studies (U81)/(U80). Quality code is 3/3 (lightcurve rating at CS3). Summary figures at the LCDB and CS3.

References edit

  1. ^ a b c d e f "4489 (1988 AK)". Minor Planet Center. Retrieved 7 June 2018.
  2. ^ a b c "WGSBN Bulletin Archive". Working Group for Small Bodies Nomenclature. 14 May 2021. Retrieved 16 May 2021. (Bulletin #1)
  3. ^ a b c d "JPL Small-Body Database Browser: 4489 (1988 AK)" (2018-04-25 last obs.). Jet Propulsion Laboratory. Retrieved 7 June 2018.
  4. ^ a b c d e f g h "LCDB Data for (4489)". Asteroid Lightcurve Database (LCDB). Retrieved 7 June 2018.
  5. ^ "List of Jupiter Trojans". Minor Planet Center. 30 May 2018. Retrieved 7 June 2018.
  6. ^ a b c "Asteroid (4489) 1988 AK". AstDyS-2, Asteroids – Dynamic Site. Retrieved 7 June 2018.
  7. ^ a b c d Grav, T.; Mainzer, A. K.; Bauer, J. M.; Masiero, J. R.; Nugent, C. R. (November 2012). "WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy". The Astrophysical Journal. 759 (1): 10. arXiv:1209.1549. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. S2CID 119101711. (online catalog)
  8. ^ a b c Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 15 June 2018.
  9. ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
  10. ^ a b Stephens, Robert D.; Coley, Daniel R.; Warner, Brian D.; French, Linda, M. (October 2016). (PDF). Minor Planet Bulletin. 43 (4): 323–331. Bibcode:2016MPBu...43..323S. ISSN 1052-8091. Archived from the original (PDF) on 22 March 2020. Retrieved 19 March 2020.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  11. ^ a b French, Linda M.; Stephens, Robert D.; Lederer, Susan M.; Coley, Daniel R.; Rohl, Derrick A. (April 2011). (PDF). Minor Planet Bulletin. 38 (2): 116–120. Bibcode:2011MPBu...38..116F. ISSN 1052-8091. Archived from the original (PDF) on 20 February 2020. Retrieved 19 March 2020.
  12. ^ a b Stephens, Robert D.; Coley, Daniel, R.; French, Linda M. (January 2016). (PDF). Minor Planet Bulletin. 43 (1): 15–22. Bibcode:2016MPBu...43...15S. ISSN 1052-8091. Archived from the original (PDF) on 3 October 2020. Retrieved 19 March 2020.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  13. ^ a b Mottola, Stefano; Di Martino, Mario; Erikson, Anders; Gonano-Beurer, Maria; Carbognani, Albino; Carsenty, Uri; et al. (May 2011). "Rotational Properties of Jupiter Trojans. I. Light Curves of 80 Objects". The Astronomical Journal. 141 (5): 32. Bibcode:2011AJ....141..170M. doi:10.1088/0004-6256/141/5/170.
  14. ^ a b Carvano, J. M.; Hasselmann, P. H.; Lazzaro, D.; Mothé-Diniz, T. (February 2010). "SDSS-based taxonomic classification and orbital distribution of main belt asteroids". Astronomy and Astrophysics. 510: 12. Bibcode:2010A&A...510A..43C. doi:10.1051/0004-6361/200913322. Retrieved 30 October 2019. (PDS data set)
  15. ^ a b Lazzaro, D.; Angeli, C. A.; Carvano, J. M.; Mothé-Diniz, T.; Duffard, R.; Florczak, M. (November 2004). "S3OS2: the visible spectroscopic survey of 820 asteroids" (PDF). Icarus. 172 (1): 179–220. Bibcode:2004Icar..172..179L. doi:10.1016/j.icarus.2004.06.006. Retrieved 7 June 2017.
  16. ^ a b c Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 – Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. S2CID 53493339.
  17. ^ a b "Asteroid (4489) 1988 AK". Small Bodies Data Ferret. Retrieved 7 June 2018.
  18. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 7 June 2018.
  19. ^ Asteroid Occultation Updates 2012-07-11 at the Wayback Machine

External links edit

  • Lightcurve Database Query (LCDB), at www.minorplanet.info
  • Discovery Circumstances: Numbered Minor Planets (1)–(5000) – Minor Planet Center
  • 4489 Dracius at AstDyS-2, Asteroids—Dynamic Site
    • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
  • 4489 Dracius at the JPL Small-Body Database  
    • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

January 01, 1970
4489, dracius, prov, designation, 1988, large, jupiter, trojan, from, greek, camp, approximately, kilometers, miles, diameter, discovered, january, 1988, american, astronomer, edward, bowell, anderson, mesa, station, lowell, observatory, near, flagstaff, arizo. 4489 Dracius prov designation 1988 AK is a large Jupiter trojan from the Greek camp approximately 90 kilometers 56 miles in diameter It was discovered on 15 January 1988 by American astronomer Edward Bowell at the Anderson Mesa Station of the Lowell Observatory near Flagstaff Arizona in the United States 1 The dark D type asteroid belongs to the 50 largest Jupiter trojans and has a rotation period of 12 58 hours 4 It was named after Dracius from Greek mythology who was a commander of the Epeans who fought against Hector 2 4489 DraciusShape model of Dracius from its lightcurveDiscovery 1 Discovered byE BowellDiscovery siteLowell Obs Discovery date15 January 1988DesignationsMPC designation 4489 DraciusNamed afterDracius Greek mythology 2 Alternative designations1988 AK 1980 KA1 1989 AQ1Minor planet categoryJupiter trojan 1 3 4 Greek 5 6 background 6 AdjectivesDracianOrbital characteristics 3 Epoch 23 March 2018 JD 2458200 5 Uncertainty parameter 0Observation arc37 94 yr 13 857 d Aphelion5 5196 AUPerihelion4 9173 AUSemi major axis5 2184 AUEccentricity0 0577Orbital period sidereal 11 92 yr 4 354 d Mean anomaly174 79 Mean motion0 4m 57 72s dayInclination22 224 Longitude of ascending node86 540 Argument of perihelion6 5830 Jupiter MOID0 1975 AUTJupiter2 8480Physical characteristicsMean diameter76 60 0 41 km 7 92 93 7 4 km 8 95 02 2 47 km 9 Synodic rotation period12 580 0 001 h 10 a 12 58 0 1 h 11 12 582 0 001 h 12 a 12 582 0 004 h 13 Geometric albedo0 050 0 003 9 0 0514 0 009 8 0 069 0 005 7 Spectral typeD SDSS MOC 14 D S3OS2 15 D Pan STARRS 4 16 V I 0 950 0 037 4 Absolute magnitude H 9 00 1 3 4 9 9 1 7 9 12 0 22 16 Contents 1 Orbit and classification 2 Numbering and naming 3 Physical characteristics 3 1 Rotation period 3 2 Diameter and albedo 4 Notes 5 References 6 External linksOrbit and classification editDracius is a dark Jovian asteroid orbiting in the leading Greek camp at Jupiter s L4 Lagrangian point 60 ahead of its orbit in a 1 1 resonance see Trojans in astronomy It is a non family asteroid in the Jovian background population 6 17 It orbits the Sun at a distance of 4 9 5 5 AU once every 11 years and 11 months 4 354 days semi major axis of 5 22 AU Its orbit has an eccentricity of 0 06 and an inclination of 22 with respect to the ecliptic 3 The body s observation arc begins with its first observation as 1980 KA1 at Crimea Nauchnij in May 1980 almost 8 years prior to its official discovery observation at Anderson Mesa 1 Numbering and naming editThis minor planet was numbered on 8 June 1990 M P C 16414 18 As of 2018 it had not been named 1 On 14 May 2021 the object was named by the Working Group for Small Bodies Nomenclature WGSBN after Dracius from Greek mythology who was a commander of the Epeans of Elis who defended the Argive ships from Hector s attack during the Trojan War 2 Before Dracius was named it belonged to a small group of only 8 unnamed minor planets with a designated number smaller than 5000 All of them are Jupiter trojans or near Earth asteroids Since then several have been named 3708 Socus 3708 1974 FV1 named in May 2021 4035 Thestor 4035 1986 WD named in May 2021 4489 Dracius 4489 1988 AK named in May 2021 4596 1981 QB 4688 1980 WF 4715 Medesicaste 4715 1989 TS1 named in May 2021 4835 Asaeus 4835 1989 BQ 4953 1990 MUPhysical characteristics editIn the SDSS based taxonomy as well as in both the Tholen and SMASS like taxonomy of the Small Solar System Objects Spectroscopic Survey S3OS2 Dracius is a dark D type asteroid 14 17 15 It has also been characterized as a D type by Pan STARRS survey 4 16 On 18 December 2012 1988 AK has occulted the star TYC 2467 00054 1 over parts of the United States The asteroid s brightness was measured at 16 1 and that of the star at 11 1 magnitude 19 Rotation period edit Since 1992 several rotational lightcurves of Dracius have been obtained from photometric observations by Stefano Mottola as well as Daniel Coley and Robert Stephens at the Center for Solar System Studies California in collaboration with Linda French and Brian Warner Lightcurve analysis gave a well defined rotation period of 12 582 hours with a consolidated brightness amplitude between 0 20 and 0 26 magnitude U 3 3 4 10 11 12 13 a Diameter and albedo edit According to the surveys carried out by the Japanese Akari satellite the Infrared Astronomical Satellite IRAS and the NEOWISE mission of NASA s Wide field Infrared Survey Explorer Dracius measures between 76 60 and 95 02 kilometers in diameter and its surface has an albedo between 0 050 and 0 069 7 8 9 The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS that is an albedo of 0 0514 and a diameter of 92 93 kilometers based on an absolute magnitude of 9 0 4 100 largest Jupiter trojansLargest Jupiter Trojans by survey A mean diameter in kilometers YoD Year of Discovery Designation H WISE IRAS Akari Ln RP V I YoD Ref 624 Hektor 7 2 225 233 230 99 L4 6 92 0 930 1907 list 617 Patroclus 8 19 140 362 140 92 140 85 L5 102 80 0 830 1906 list 911 Agamemnon 7 89 131 038 166 66 185 30 L4 6 59 0 980 1919 list 588 Achilles 8 67 130 099 135 47 133 22 L4 7 31 0 940 1906 list 3451 Mentor 8 4 126 288 116 30 117 91 L5 7 70 0 770 1984 list 3317 Paris 8 3 118 790 116 26 120 45 L5 7 09 0 950 1984 list 1867 Deiphobus 8 3 118 220 122 67 131 31 L5 58 66 0 930 1971 list 1172 Aneas 8 33 118 020 142 82 148 66 L5 8 71 0 950 1930 list 1437 Diomedes 8 3 117 786 164 31 172 60 L4 24 49 0 810 1937 list 1143 Odysseus 7 93 114 624 125 64 130 81 L4 10 11 0 860 1930 list 2241 Alcathous 8 64 113 682 114 63 118 87 L5 7 69 0 940 1979 list 659 Nestor 8 99 112 320 108 87 107 06 L4 15 98 0 790 1908 list 3793 Leonteus 8 7 112 046 86 26 87 58 L4 5 62 0 780 1985 list 3063 Makhaon 8 4 111 655 116 14 114 34 L4 8 64 0 830 1983 list 1583 Antilochus 8 6 108 842 101 62 111 69 L4 31 54 0 950 1950 list 884 Priamus 8 81 101 093 96 29 119 99 L5 6 86 0 900 1917 list 1208 Troilus 8 99 100 477 103 34 111 36 L5 56 17 0 740 1931 list 1173 Anchises 8 89 99 549 126 27 120 49 L5 11 60 0 780 1930 list 2207 Antenor 8 89 97 658 85 11 91 32 L5 7 97 0 950 1977 list 2363 Cebriones 9 11 95 976 81 84 84 61 L5 20 05 0 910 1977 list 4063 Euforbo 8 7 95 619 102 46 106 38 L4 8 85 0 950 1989 list 2357 Phereclos 8 94 94 625 94 90 98 45 L5 14 39 0 960 1981 list 4709 Ennomos 8 5 91 433 80 85 80 03 L5 12 28 0 690 1988 list 2797 Teucer 8 7 89 430 111 14 113 99 L4 10 15 0 920 1981 list 2920 Automedon 8 8 88 574 111 01 113 11 L4 10 21 0 950 1981 list 15436 Dexius 9 1 87 646 85 71 78 63 L4 8 97 0 870 1998 list 3596 Meriones 9 2 87 380 75 09 73 28 L4 12 96 0 830 1985 list 2893 Peiroos 9 23 86 884 87 46 86 76 L5 8 96 0 950 1975 list 4086 Podalirius 9 1 85 495 86 89 85 98 L4 10 43 0 870 1985 list 4060 Deipylos 9 3 84 043 79 21 86 79 L4 9 30 0 760 1987 list 1404 Ajax 9 3 83 990 81 69 96 34 L4 29 38 0 960 1936 list 4348 Poulydamas 9 5 82 032 70 08 87 51 L5 9 91 0 840 1988 list 5144 Achates 9 0 80 958 91 91 89 85 L5 5 96 0 920 1991 list 4833 Meges 8 9 80 165 87 33 89 39 L4 14 25 0 940 1989 list 2223 Sarpedon 9 41 77 480 94 63 108 21 L5 22 74 0 880 1977 list 4489 Dracius 9 0 76 595 92 93 95 02 L4 12 58 0 950 1988 list 2260 Neoptolemus 9 31 76 435 71 65 81 28 L4 8 18 0 950 1975 list 5254 Ulysses 9 2 76 147 78 34 80 00 L4 28 72 0 970 1986 list 3708 Socus 9 3 75 661 79 59 76 75 L5 6 55 0 980 1974 list 2674 Pandarus 9 1 74 267 98 10 101 72 L5 8 48 1 000 1982 list 3564 Talthybius 9 4 73 730 68 92 74 11 L4 40 59 0 900 1985 list 4834 Thoas 9 1 72 331 86 82 96 21 L4 18 19 0 950 1989 list 7641 Cteatus 9 4 71 839 68 97 75 28 L4 27 77 0 980 1986 list 3540 Protesilaos 9 3 70 225 76 84 87 66 L4 8 95 0 940 1973 list 11395 Iphinous 9 8 68 977 64 71 67 78 L4 17 38 1998 list 4035 Thestor 9 6 68 733 68 23 66 99 L4 13 47 0 970 1986 list 5264 Telephus 9 4 68 472 73 26 81 38 L4 9 53 0 970 1991 list 1868 Thersites 9 5 68 163 70 08 78 89 L4 10 48 0 960 1960 list 9799 Thronium 9 6 68 033 64 87 72 42 L4 21 52 0 910 1996 list 4068 Menestheus 9 5 67 625 62 37 68 46 L4 14 40 0 950 1973 list 23135 Pheidas 9 9 66 230 58 29 68 50 L4 8 69 0 860 2000 list 2456 Palamedes 9 3 65 916 91 66 99 60 L4 7 24 0 920 1966 list 3709 Polypoites 9 1 65 297 99 09 85 23 L4 10 04 1 000 1985 list 1749 Telamon 9 5 64 898 81 06 69 14 L4 16 98 0 970 1949 list 3548 Eurybates 9 6 63 885 72 14 68 40 L4 8 71 0 730 1973 list 4543 Phoinix 9 7 63 836 62 79 69 54 L4 38 87 1 200 1989 list 12444 Prothoon 9 8 63 835 64 31 62 41 L5 15 82 1996 list 4836 Medon 9 5 63 277 67 73 78 70 L4 9 82 0 920 1989 list 16070 Charops 9 7 63 191 64 13 68 98 L5 20 24 0 960 1999 list 15440 Eioneus 9 6 62 519 66 48 71 88 L4 21 43 0 970 1998 list 4715 Medesicaste 9 7 62 097 63 91 65 93 L5 8 81 0 850 1989 list 34746 Thoon 9 8 61 684 60 51 63 63 L5 19 63 0 950 2001 list 38050 Bias 9 8 61 603 61 04 50 44 L4 18 85 0 990 1998 list 5130 Ilioneus 9 7 60 711 59 40 52 49 L5 14 77 0 960 1989 list 5027 Androgeos 9 6 59 786 57 86 n a L4 11 38 0 910 1988 list 6090 Aulis 9 4 59 568 74 53 81 92 L4 18 48 0 980 1989 list 5648 Axius 9 7 59 295 63 91 n a L5 37 56 0 900 1990 list 7119 Hiera 9 7 59 150 76 40 77 29 L4 400 0 950 1989 list 4805 Asteropaios 10 0 57 647 53 16 43 44 L5 12 37 1990 list 16974 Iphthime 9 8 57 341 55 43 57 15 L4 78 9 0 960 1998 list 4867 Polites 9 8 57 251 58 29 64 29 L5 11 24 1 010 1989 list 2895 Memnon 10 0 56 706 55 67 n a L5 7 50 0 710 1981 list 4708 Polydoros 9 9 54 964 55 67 n a L5 7 52 0 960 1988 list 21601 1998 XO89 10 0 54 909 55 67 56 08 L4 12 65 0 970 1998 list 12929 Periboea 9 9 54 077 61 04 55 34 L5 9 27 0 880 1999 list 17492 Hippasos 10 0 53 975 55 67 n a L5 17 75 1991 list 5652 Amphimachus 10 1 53 921 53 16 52 48 L4 8 37 1 050 1992 list 2759 Idomeneus 9 9 53 676 61 01 52 55 L4 32 38 0 910 1980 list 5258 Rhoeo 10 2 53 275 50 77 n a L4 19 85 1 010 1989 list 12126 1999 RM11 10 1 53 202 n a n a L5 n a 1999 list 15502 1999 NV27 10 0 53 100 55 67 50 86 L5 15 13 0 875 1999 list 4754 Panthoos 10 0 53 025 53 15 56 96 L5 27 68 1977 list 4832 Palinurus 10 0 52 058 53 16 n a L5 5 32 1 000 1988 list 5126 Achaemenides 10 5 51 922 44 22 48 57 L4 53 02 1989 list 3240 Laocoon 10 2 51 695 50 77 n a L5 11 31 0 880 1978 list 4902 Thessandrus 9 8 51 263 61 04 71 79 L4 738 0 960 1989 list 11552 Boucolion 10 1 51 136 53 16 53 91 L5 32 44 1993 list 20729 1999 XS143 10 4 50 961 46 30 n a L4 5 72 1 000 1999 list 6545 Leitus 10 1 50 951 53 16 n a L4 16 26 0 910 1986 list 4792 Lykaon 10 1 50 870 53 16 n a L5 40 09 0 960 1988 list 21900 Orus 10 0 50 810 55 67 53 87 L4 13 45 0 950 1999 list 1873 Agenor 10 1 50 799 53 76 54 38 L5 20 60 1971 list 5028 Halaesus 10 2 50 770 50 77 n a L4 24 94 0 900 1988 list 2146 Stentor 9 9 50 755 58 29 n a L4 16 40 1976 list 4722 Agelaos 10 0 50 378 53 16 59 47 L5 18 44 0 910 1977 list 5284 Orsilocus 10 1 50 159 53 16 n a L4 10 31 0 970 1989 list 11509 Thersilochos 10 1 49 960 53 16 56 23 L5 17 37 1990 list 5285 Krethon 10 1 49 606 58 53 52 61 L4 12 04 1 090 1989 list 4791 Iphidamas 10 1 49 528 57 85 59 96 L5 9 70 1 030 1988 list 9023 Mnesthus 10 1 49 151 50 77 60 80 L5 30 66 1988 list 5283 Pyrrhus 9 7 48 356 64 58 69 93 L4 7 32 0 950 1989 list 4946 Askalaphus 10 2 48 209 52 71 66 10 L4 22 73 0 940 1988 list 22149 2000 WD49 10 2 48 190 50 77 50 37 L4 7 84 1 090 2000 list 32496 2000 WX182 10 2 48 017 50 77 51 63 L5 23 34 0 950 2000 list 5120 Bitias 10 2 47 987 50 77 n a L5 15 21 0 780 1988 list 12714 Alkimos 10 1 47 819 61 04 54 62 L4 28 48 1991 list 7352 Hypsenor 9 9 47 731 55 67 47 07 L5 648 0 850 1994 list 1870 Glaukos 10 6 47 649 42 23 n a L5 5 99 1971 list 4138 Kalchas 10 1 46 462 53 16 61 04 L4 29 2 0 810 1973 list 23958 1998 VD30 10 2 46 001 50 77 47 91 L4 562 0 990 1998 list 4828 Misenus 10 4 45 954 46 30 43 22 L5 12 87 0 920 1988 list 4057 Demophon 10 1 45 683 53 16 n a L4 29 82 1 060 1985 list 4501 Eurypylos 10 4 45 524 46 30 n a L4 6 05 1989 list 4007 Euryalos 10 3 45 515 48 48 53 89 L4 6 39 1973 list 5259 Epeigeus 10 3 44 741 42 59 44 42 L4 18 42 1989 list 30705 Idaios 10 4 44 546 46 30 n a L5 15 74 1977 list 16560 Daitor 10 7 43 861 51 42 43 38 L5 1991 list 15977 1998 MA11 10 4 43 530 46 30 51 53 L5 250 0 906 1998 list 7543 Prylis 10 6 42 893 42 23 n a L4 17 80 1973 list 4827 Dares 10 5 42 770 44 22 n a L5 19 00 1988 list 1647 Menelaus 10 5 42 716 44 22 n a L4 17 74 0 866 1957 list A Used sources WISE NEOWISE catalog NEOWISE DIAM V1 PDS Grav 2012 IRAS data SIMPS v 6 catalog and Akari catalog Usui 2011 RP rotation period and V I color index taken from the LCDB Note missing data was completed with figures from the JPL SBDB query and from the LCDB query form for the WISE NEOWISE and SIMPS catalogs respectively These figures are given in italics Also listing is incomplete above 100 Notes edit a b c Lightcurve plots of 4489 1988 AK 4489 Dracius from March 2015 and April 2016 by Daniel Coley and Robert Stephens at the Center for Solar System Studies U81 U80 Quality code is 3 3 lightcurve rating at CS3 Summary figures at the LCDB and CS3 References edit a b c d e f 4489 1988 AK Minor Planet Center Retrieved 7 June 2018 a b c WGSBN Bulletin Archive Working Group for Small Bodies Nomenclature 14 May 2021 Retrieved 16 May 2021 Bulletin 1 a b c d JPL Small Body Database Browser 4489 1988 AK 2018 04 25 last obs Jet Propulsion Laboratory Retrieved 7 June 2018 a b c d e f g h LCDB Data for 4489 Asteroid Lightcurve Database LCDB Retrieved 7 June 2018 List of Jupiter Trojans Minor Planet Center 30 May 2018 Retrieved 7 June 2018 a b c Asteroid 4489 1988 AK AstDyS 2 Asteroids Dynamic Site Retrieved 7 June 2018 a b c d Grav T Mainzer A K Bauer J M Masiero J R Nugent C R November 2012 WISE NEOWISE Observations of the Jovian Trojan Population Taxonomy The Astrophysical Journal 759 1 10 arXiv 1209 1549 Bibcode 2012ApJ 759 49G doi 10 1088 0004 637X 759 1 49 S2CID 119101711 online catalog a b c Tedesco E F Noah P V Noah M Price S D October 2004 IRAS Minor Planet Survey V6 0 NASA Planetary Data System IRAS A FPA 3 RDR IMPS V6 0 IRAS A FPA 3 RDR IMPS V6 0 Bibcode 2004PDSS 12 T Retrieved 15 June 2018 a b c d Usui Fumihiko Kuroda Daisuke Muller Thomas G Hasegawa Sunao Ishiguro Masateru Ootsubo Takafumi et al October 2011 Asteroid Catalog Using Akari AKARI IRC Mid Infrared Asteroid Survey Publications of the Astronomical Society of Japan 63 5 1117 1138 Bibcode 2011PASJ 63 1117U doi 10 1093 pasj 63 5 1117 online AcuA catalog p 153 a b Stephens Robert D Coley Daniel R Warner Brian D French Linda M October 2016 Lightcurves of Jovian Trojan Asteroids from the Center for Solar System Studies L4 Greek Camp and Spies PDF Minor Planet Bulletin 43 4 323 331 Bibcode 2016MPBu 43 323S ISSN 1052 8091 Archived from the original PDF on 22 March 2020 Retrieved 19 March 2020 a href Template Cite journal html title Template Cite journal cite journal a CS1 maint multiple names authors list link a b French Linda M Stephens Robert D Lederer Susan M Coley Daniel R Rohl Derrick A April 2011 Preliminary Results from a Study of Trojan Asteroids PDF Minor Planet Bulletin 38 2 116 120 Bibcode 2011MPBu 38 116F ISSN 1052 8091 Archived from the original PDF on 20 February 2020 Retrieved 19 March 2020 a b Stephens Robert D Coley Daniel R French Linda M January 2016 Large L5 Jovian Trojan Asteroid Lightcurves from the Center for Solar System Studies PDF Minor Planet Bulletin 43 1 15 22 Bibcode 2016MPBu 43 15S ISSN 1052 8091 Archived from the original PDF on 3 October 2020 Retrieved 19 March 2020 a href Template Cite journal html title Template Cite journal cite journal a CS1 maint multiple names authors list link a b Mottola Stefano Di Martino Mario Erikson Anders Gonano Beurer Maria Carbognani Albino Carsenty Uri et al May 2011 Rotational Properties of Jupiter Trojans I Light Curves of 80 Objects The Astronomical Journal 141 5 32 Bibcode 2011AJ 141 170M doi 10 1088 0004 6256 141 5 170 a b Carvano J M Hasselmann P H Lazzaro D Mothe Diniz T February 2010 SDSS based taxonomic classification and orbital distribution of main belt asteroids Astronomy and Astrophysics 510 12 Bibcode 2010A amp A 510A 43C doi 10 1051 0004 6361 200913322 Retrieved 30 October 2019 PDS data set a b Lazzaro D Angeli C A Carvano J M Mothe Diniz T Duffard R Florczak M November 2004 S3OS2 the visible spectroscopic survey of 820 asteroids PDF Icarus 172 1 179 220 Bibcode 2004Icar 172 179L doi 10 1016 j icarus 2004 06 006 Retrieved 7 June 2017 a b c Veres Peter Jedicke Robert Fitzsimmons Alan Denneau Larry Granvik Mikael Bolin Bryce et al November 2015 Absolute magnitudes and slope parameters for 250 000 asteroids observed by Pan STARRS PS1 Preliminary results Icarus 261 34 47 arXiv 1506 00762 Bibcode 2015Icar 261 34V doi 10 1016 j icarus 2015 08 007 S2CID 53493339 a b Asteroid 4489 1988 AK Small Bodies Data Ferret Retrieved 7 June 2018 MPC MPO MPS Archive Minor Planet Center Retrieved 7 June 2018 Asteroid Occultation Updates Archived 2012 07 11 at the Wayback MachineExternal links editLightcurve Database Query LCDB at www minorplanet info Discovery Circumstances Numbered Minor Planets 1 5000 Minor Planet Center 4489 Dracius at AstDyS 2 Asteroids Dynamic Site Ephemeris Observation prediction Orbital info Proper elements Observational info 4489 Dracius at the JPL Small Body Database nbsp Close approach Discovery Ephemeris Orbit diagram Orbital elements Physical parameters Retrieved from https en wikipedia org w index php title 4489 Dracius amp oldid 1195678668, wikipedia, wiki, book, books, library,

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