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(6178) 1986 DA

January 01, 1970

(6178) 1986 DA is a metallic asteroid, classified as near-Earth object of the Amor group, approximately 3 kilometers in diameter. It was discovered on 16 February 1986, by Japanese astronomer Minoru Kizawa at Shizuoka Observatory, Japan.[2]

(6178) 1986 DA
Discovery[1]
Discovered byM. Kizawa
Discovery siteShizuoka Obs.
Discovery date16 February 1986
Designations
(6178) 1986 DA
1986 DA
Amor · NEO[2]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc38.03 yr (13,890 days)
Aphelion4.4648 AU
Perihelion1.1805 AU
2.8226 AU
Eccentricity0.5818
4.74 yr (1,732 days)
233.20°
0° 12m 28.08s / day
Inclination4.3056°
64.643°
127.36°
Earth MOID0.1922 AU · 74.9 LD
Jupiter MOID0.5212 AU
Physical characteristics
Mean diameter
2.3 km (dated)[1]
3.149 km[3]
3.15 km (taken)[4]
3.199±0.207 km[5]
3.50 h[6][a]
3.51 h[7]
0.0778[3]
0.15[1]
0.161±0.034[5]
M[4][8]
B–V = 0.677[1]
U–B = 0.267[1]
15.1[1][5] · 15.40±0.1 (R)[a] · 15.9±0.112[3][4] · 16.11[7]

1986 DA was the first near Earth asteroid thought to be of metallic composition, with high radar brightness; with that it was predicted to have 100 thousand tons of platinum group metals including gold and suggested as a resource for future space colonists.[9]

Orbit and classification edit

As an eccentric Amor asteroid has an Earth minimum orbit intersection distance of 0.1922 AU (28,800,000 km) and approaches the orbit of Earth from the outside but does not cross it. It crosses however the orbit of Mars and can be classified as a Mars-crosser and also approaches the orbit of Jupiter within 0.5 AU.[1] The asteroid orbits the Sun at a distance of 1.2–4.5 AU once every 4 years and 9 months (1,732 days). Its orbit has an eccentricity of 0.58 and an inclination of 4° with respect to the ecliptic.[1] The first precovery was taken at Siding Spring Observatory in 1977, extending the asteroid's observation arc by 9 years prior to its discovery.[2]

Physical characteristics edit

The metallic M-type asteroid is notable for being significantly more radar-reflective than other asteroids. Radar measurements suggest it is composed of nickel and iron and that it was derived from the center of a much larger object that experienced melting and differentiation. The observed radar albedo was 0.58 and the optical albedo was 0.14.[8]

Rotation and shape edit

It was most probably formed from a larger body through a catastrophic collision with another object. Radar measurements of this body indicate that the surface is relatively smooth on scales of less than a meter, but it is highly irregular on scales of 10–100 meters.[citation needed] Several lightcurve analysis gave it a concurring rotation period of 3.50 to 3.51 hours with a relatively high brightness amplitude between 0.03 and 0.48 in magnitude, indicating an irregular shape (U=3/3/n.a.).[6][7][a]

Diameter and albedo edit

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid has an albedo of 0.08 and 0.16, and a diameter of 3.1 to 3.2 kilometers, respectively.[3][5] The Collaborative Asteroid Lightcurve Link selects 3.15 kilometers as best result, while the first estimate from 1994 gave a diameter of 2.3 kilometers.[1]

Mining considerations edit

The asteroid achieved its most notable recognition when scientists revealed that it contained over "10,000 tons of gold and 100,000 tons of platinum", or an approximate value at the time of its discovery of "$90 billion for the gold and a cool trillion dollars for the platinum, plus loose change for the asteroid's 10 billion tons of iron and a billion tons of nickel."[10] In 2012 the estimated value of 100,000 tons of platinum was worth approximately five trillion US dollars. The delta-v for a spacecraft rendezvous with this asteroid from low Earth orbit is 7.1 km/s.[11]

Notes edit

  1. ^ a b c Pravec (1999) web: rotation period 3.50 hours with a brightness amplitude of 0.3 mag. H = 15.4. No LCDB quality code assigned. No lightcurve published (note: "N"). Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (6178) and Pravec, P.; Wolf, M.; Sarounova, L. (1999)

See also edit

References edit

  1. ^ a b c d e f g h i j "JPL Small-Body Database Browser: 6178 (1986 DA)" (2015-07-28 last obs.). Jet Propulsion Laboratory. Retrieved 26 May 2017.
  2. ^ a b c "6178 (1986 DA)". Minor Planet Center. Retrieved 26 May 2016.
  3. ^ a b c d Pravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus. 221 (1): 365–387. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026.
  4. ^ a b c "LCDB Data for (6178)". Asteroid Lightcurve Database (LCDB). Retrieved 26 May 2016.
  5. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. S2CID 118700974.
  6. ^ a b Zeigler, K. W. (March 1990). "Photoelectric Photometry of Asteroids 81 Terpsichore, 381 Myrrha, and 1986 DA". The Minor Planet Bulletin. 17: 1. Bibcode:1990MPBu...17....1Z.
  7. ^ a b c Wisniewski, W. Z. (June 1987). "Photometry of six radar target asteroids". Icarus. 70 (3): 566–572. Bibcode:1987Icar...70..566W. doi:10.1016/0019-1035(87)90096-0. ISSN 0019-1035.
  8. ^ a b Ostro, S. J.; Rosema, K. D.; Campbell, D. B.; Chandler, J. F.; Hine, A. A.; Hudson, R. S. (June 1991). "Asteroid 1986 DA - Radar evidence for a metallic composition". Science. 252 (5011): 1399–1404.NASA–supportedresearch.(SciHomepage). Bibcode:1991Sci...252.1399O. doi:10.1126/science.252.5011.1399. hdl:2060/19920003664. ISSN 0036-8075. PMID 17772910. S2CID 2510757.
  9. ^ "Near-Earth Metal Asteroid Discovered". NASA/JPL. Retrieved 30 October 2018.
  10. ^ Ostro, Steven J.; Campbell, D. B.; Chandler, J. F.; Hine, A. A.; Hudson, R. S.; Rosema, K. D.; et al. (October 1991). "Asteroid 1986 DA: Radar evidence for a metallic composition". In NASA. 252 (5011): 1399–1704. Bibcode:1991plas.rept..174O. doi:10.1126/science.252.5011.1399. hdl:2060/19920003664. PMID 17772910. S2CID 2510757.
  11. ^ . NASA. 1 June 2006. Archived from the original on 3 June 2001. Retrieved 8 June 2006.

External links edit

  • Asteroid Lightcurve Database (LCDB), query form (info 16 December 2017 at the Wayback Machine)
  • Dictionary of Minor Planet Names, Google books
  • Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
  • (6178) 1986 DA at NeoDyS-2, Near Earth Objects—Dynamic Site
    • Ephemerides · Observation prediction · Orbital info · MOID · Proper elements · Observational info · Close approaches · Physical info · Orbit animation
  • (6178) 1986 DA at ESA–space situational awareness
    • Ephemerides · Observations · Orbit · Physical properties · Summary
  • (6178) 1986 DA at the JPL Small-Body Database  
    • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

January 01, 1970
6178, 1986, metallic, asteroid, classified, near, earth, object, amor, group, approximately, kilometers, diameter, discovered, february, 1986, japanese, astronomer, minoru, kizawa, shizuoka, observatory, japan, discovery, discovered, kizawadiscovery, siteshizu. 6178 1986 DA is a metallic asteroid classified as near Earth object of the Amor group approximately 3 kilometers in diameter It was discovered on 16 February 1986 by Japanese astronomer Minoru Kizawa at Shizuoka Observatory Japan 2 6178 1986 DADiscovery 1 Discovered byM KizawaDiscovery siteShizuoka Obs Discovery date16 February 1986DesignationsMPC designation 6178 1986 DAAlternative designations1986 DAMinor planet categoryAmor NEO 2 Orbital characteristics 1 Epoch 4 September 2017 JD 2458000 5 Uncertainty parameter 0Observation arc38 03 yr 13 890 days Aphelion4 4648 AUPerihelion1 1805 AUSemi major axis2 8226 AUEccentricity0 5818Orbital period sidereal 4 74 yr 1 732 days Mean anomaly233 20 Mean motion0 12m 28 08s dayInclination4 3056 Longitude of ascending node64 643 Argument of perihelion127 36 Earth MOID0 1922 AU 74 9 LDJupiter MOID0 5212 AUPhysical characteristicsMean diameter2 3 km dated 1 3 149 km 3 3 15 km taken 4 3 199 0 207 km 5 Synodic rotation period3 50 h 6 a 3 51 h 7 Geometric albedo0 0778 3 0 15 1 0 161 0 034 5 Spectral typeM 4 8 B V 0 677 1 U B 0 267 1 Absolute magnitude H 15 1 1 5 15 40 0 1 R a 15 9 0 112 3 4 16 11 7 1986 DA was the first near Earth asteroid thought to be of metallic composition with high radar brightness with that it was predicted to have 100 thousand tons of platinum group metals including gold and suggested as a resource for future space colonists 9 Contents 1 Orbit and classification 2 Physical characteristics 2 1 Rotation and shape 2 2 Diameter and albedo 2 3 Mining considerations 3 Notes 4 See also 5 References 6 External linksOrbit and classification editAs an eccentric Amor asteroid has an Earth minimum orbit intersection distance of 0 1922 AU 28 800 000 km and approaches the orbit of Earth from the outside but does not cross it It crosses however the orbit of Mars and can be classified as a Mars crosser and also approaches the orbit of Jupiter within 0 5 AU 1 The asteroid orbits the Sun at a distance of 1 2 4 5 AU once every 4 years and 9 months 1 732 days Its orbit has an eccentricity of 0 58 and an inclination of 4 with respect to the ecliptic 1 The first precovery was taken at Siding Spring Observatory in 1977 extending the asteroid s observation arc by 9 years prior to its discovery 2 Physical characteristics editThe metallic M type asteroid is notable for being significantly more radar reflective than other asteroids Radar measurements suggest it is composed of nickel and iron and that it was derived from the center of a much larger object that experienced melting and differentiation The observed radar albedo was 0 58 and the optical albedo was 0 14 8 Rotation and shape edit It was most probably formed from a larger body through a catastrophic collision with another object Radar measurements of this body indicate that the surface is relatively smooth on scales of less than a meter but it is highly irregular on scales of 10 100 meters citation needed Several lightcurve analysis gave it a concurring rotation period of 3 50 to 3 51 hours with a relatively high brightness amplitude between 0 03 and 0 48 in magnitude indicating an irregular shape U 3 3 n a 6 7 a Diameter and albedo edit According to the survey carried out by NASA s Wide field Infrared Survey Explorer with its subsequent NEOWISE mission the asteroid has an albedo of 0 08 and 0 16 and a diameter of 3 1 to 3 2 kilometers respectively 3 5 The Collaborative Asteroid Lightcurve Link selects 3 15 kilometers as best result while the first estimate from 1994 gave a diameter of 2 3 kilometers 1 Mining considerations edit The asteroid achieved its most notable recognition when scientists revealed that it contained over 10 000 tons of gold and 100 000 tons of platinum or an approximate value at the time of its discovery of 90 billion for the gold and a cool trillion dollars for the platinum plus loose change for the asteroid s 10 billion tons of iron and a billion tons of nickel 10 In 2012 the estimated value of 100 000 tons of platinum was worth approximately five trillion US dollars The delta v for a spacecraft rendezvous with this asteroid from low Earth orbit is 7 1 km s 11 Notes edit a b c Pravec 1999 web rotation period 3 50 hours with a brightness amplitude of 0 3 mag H 15 4 No LCDB quality code assigned No lightcurve published note N Summary figures at Collaborative Asteroid Lightcurve Link CALL for 6178 and Pravec P Wolf M Sarounova L 1999 See also editPsyche spacecraft planned mission to heaviest metal asteroid 16 PsycheReferences edit a b c d e f g h i j JPL Small Body Database Browser 6178 1986 DA 2015 07 28 last obs Jet Propulsion Laboratory Retrieved 26 May 2017 a b c 6178 1986 DA Minor Planet Center Retrieved 26 May 2016 a b c d Pravec Petr Harris Alan W Kusnirak Peter Galad Adrian Hornoch Kamil September 2012 Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations Icarus 221 1 365 387 Bibcode 2012Icar 221 365P doi 10 1016 j icarus 2012 07 026 a b c LCDB Data for 6178 Asteroid Lightcurve Database LCDB Retrieved 26 May 2016 a b c d Mainzer A Grav T Masiero J Hand E Bauer J Tholen D et al November 2011 NEOWISE Studies of Spectrophotometrically Classified Asteroids Preliminary Results The Astrophysical Journal 741 2 25 arXiv 1109 6407 Bibcode 2011ApJ 741 90M doi 10 1088 0004 637X 741 2 90 S2CID 118700974 a b Zeigler K W March 1990 Photoelectric Photometry of Asteroids 81 Terpsichore 381 Myrrha and 1986 DA The Minor Planet Bulletin 17 1 Bibcode 1990MPBu 17 1Z a b c Wisniewski W Z June 1987 Photometry of six radar target asteroids Icarus 70 3 566 572 Bibcode 1987Icar 70 566W doi 10 1016 0019 1035 87 90096 0 ISSN 0019 1035 a b Ostro S J Rosema K D Campbell D B Chandler J F Hine A A Hudson R S June 1991 Asteroid 1986 DA Radar evidence for a metallic composition Science 252 5011 1399 1404 NASA supportedresearch SciHomepage Bibcode 1991Sci 252 1399O doi 10 1126 science 252 5011 1399 hdl 2060 19920003664 ISSN 0036 8075 PMID 17772910 S2CID 2510757 Near Earth Metal Asteroid Discovered NASA JPL Retrieved 30 October 2018 Ostro Steven J Campbell D B Chandler J F Hine A A Hudson R S Rosema K D et al October 1991 Asteroid 1986 DA Radar evidence for a metallic composition In NASA 252 5011 1399 1704 Bibcode 1991plas rept 174O doi 10 1126 science 252 5011 1399 hdl 2060 19920003664 PMID 17772910 S2CID 2510757 Delta v for spacecraft rendezvous with all known near Earth asteroids NASA 1 June 2006 Archived from the original on 3 June 2001 Retrieved 8 June 2006 External links editAsteroid Lightcurve Database LCDB query form info Archived 16 December 2017 at the Wayback Machine Dictionary of Minor Planet Names Google books Asteroids and comets rotation curves CdR Observatoire de Geneve Raoul Behrend 6178 1986 DA at NeoDyS 2 Near Earth Objects Dynamic Site Ephemerides Observation prediction Orbital info MOID Proper elements Observational info Close approaches Physical info Orbit animation 6178 1986 DA at ESA space situational awareness Ephemerides Observations Orbit Physical properties Summary 6178 1986 DA 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 6178 1986 DA amp oldid 1190799106, wikipedia, wiki, book, books, library,

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