1467 Mashona
1467 Mashona, provisional designation 1938 OE, is a rare-type carbonaceous asteroid from the outer regions of the asteroid belt, approximately 100 kilometers in diameter, making it one of the top 200 largest asteroids currently known to exist. It was discovered on 30 July 1938, by South African astronomer Cyril Jackson at the Johannesburg Observatory in South Africa.[11] It was later named after the native Shona people of Zimbabwe.[2]
| Discovery[1] | |
|---|---|
| Discovered by | C. Jackson |
| Discovery site | Johannesburg Obs. |
| Discovery date | 30 July 1938 |
| Designations | |
| (1467) Mashona | |
Named after | Shona people (Mashona) (natives of Mashonaland)[2] |
| 1938 OE · 1930 DL 1936 DK · 1936 FA1 1948 EG · A923 CB | |
| main-belt · (outer)[1] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 94.41 yr (34,483 days) |
| Aphelion | 3.8268 AU |
| Perihelion | 2.9485 AU |
| 3.3877 AU | |
| Eccentricity | 0.1296 |
| 6.24 yr (2,277 days) | |
| 255.30° | |
| 0° 9m 29.16s / day | |
| Inclination | 21.910° |
| 326.50° | |
| 349.55° | |
| Physical characteristics | |
| Dimensions | 89.160±0.728 km[3] 90.93±28.77 km[4] 95.08±1.30 km[5] 104.119±1.062 km[6] 107.54 km (calculated)[7] |
| 9.740±0.0029 h[8] 9.744±0.001 h[9] 9.76 h[10] | |
| 0.05±0.03[4] 0.057 (assumed)[7] 0.0609±0.0111[6] 0.074±0.002[5] 0.083±0.014[3] | |
| Tholen = GC[1] · GC[7] B–V = 0.743[1] U–B = 0.373[1] | |
| 8.515±0.001 (R)[8] 8.57[1][4][5][6][7] | |
Classification and orbit
Mashona orbits the Sun in the outer main-belt at a distance of 2.9–3.8 AU once every 6 years and 3 months (2,277 days). Its orbit has an eccentricity of 0.13 and an inclination of 22° with respect to the ecliptic.[1] It is a member of the Cybele asteroid group.[12]
In February 1923, it was first identified as 1923 CB at Heidelberg Observatory in Germany. The body's observation arc begins at Johannesburg, 5 days after its official discovery observation.[11]
Mashona was the highest numbered asteroid used in calculating the future orbit of 101955 Bennu.[13]
Physical characteristics
In the Tholen classification, Mashona is a rare GC-type, a spectral type that transitions between the common C and rare G-type asteroids.[1]
Lightcurves
Until April 2010, three rotational lightcurves of Mashona have been obtained from photometric observations. Lightcurve analysis gave a well-defined rotation period between 9.74 and 9.76 hours with a brightness amplitude varying from 0.24 to 0.31 magnitude (U=3/2/3).[8][9][10]
Diameter and albedo
According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Mashona measures between 89.160 and 104.119 kilometers in diameter and its surface has an albedo between 0.05 and 0.083.[3][4][5][6] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 107.54 kilometers based on an absolute magnitude of 8.57.[7] Among nearly half a million asteroids, Mashona belongs to the 200 largest bodies.[14]
Naming
This minor planet was named for the Shona people (Mashona), natives of Mashonaland in Zimbabwe, then Rhodesia.[2] The official naming citation was published by the Minor Planet Center in April 1953 (M.P.C. 909).[15]
References
- ^ a b c d e f g h i "JPL Small-Body Database Browser: 1467 Mashona (1938 OE)" (2017-07-05 last obs.). Jet Propulsion Laboratory. Retrieved 24 July 2017.
- ^ a b c Schmadel, Lutz D. (2007). "(1467) Mashona". Dictionary of Minor Planet Names – (1467) Mashona. Springer Berlin Heidelberg. p. 117. doi:10.1007/978-3-540-29925-7_1468. ISBN 978-3-540-00238-3.
- ^ a b c Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 24 July 2017.
- ^ a b c d Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 24 July 2017.
- ^ 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)
- ^ 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.
- ^ a b c d e "LCDB Data for (1467) Mashona". Asteroid Lightcurve Database (LCDB). Retrieved 24 July 2017.
- ^ a b c Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 24 July 2017.
- ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1467) Mashona". Geneva Observatory. Retrieved 24 July 2017.
- ^ a b Lagerkvist, Claes-Ingvar; Erikson, Anders; Lahulla, Felix; De Martino, Mario; Nathues, Andreas; Dahlgren, Mats (January 2001). "A Study of Cybele Asteroids. I. Spin Properties of Ten Asteroids". Icarus. 149 (1): 190–197. Bibcode:2001Icar..149..190L. doi:10.1006/icar.2000.6507. Retrieved 24 July 2017.
- ^ a b "1467 Mashona (1938 OE)". Minor Planet Center. Retrieved 24 July 2017.
- ^ Lagerkvist, Claes-Ingvar; et al. (January 2001), "A Study of Cybele Asteroids. I. Spin Properties of Ten Asteroids", Icarus, 149 (1): 190–197, Bibcode:2001Icar..149..190L, doi:10.1006/icar.2000.6507.
- ^ Farnocchia, Davide; Chesley, Steven R.; Takahashi, Yu (2021). "Ephemeris and hazard assessment for near-Earth asteroid (101955) Bennu based on OSIRIS-REx data". Icarus. doi:10.1016/j.icarus.2021.114594.
- ^ Wm. Robert Johnston (7 February 2015). "The largest asteroids and outer solar system objects". Johnston's Archive. Retrieved 24 July 2017.
- ^ Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.
External links
- 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
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 1467 Mashona at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
- 1467 Mashona at the JPL Small-Body Database