5642 Bobbywilliams
| Discovery [1] | |
|---|---|
| Discovered by | H. E. Holt |
| Discovery site | Palomar Obs. |
| Discovery date | 27 July 1990 |
| Designations | |
| MPC designation | 5642 Bobbywilliams |
Named after |
Bobby G. Williams (JPL staff member)[2] |
| 1990 OK1 | |
| Mars-crosser [3][4] | |
| Orbital characteristics [1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 40.87 yr (14,928 days) |
| Aphelion | 3.0867 AU |
| Perihelion | 1.5431 AU |
| 2.3149 AU | |
| Eccentricity | 0.3334 |
| 3.52 yr (1,286 days) | |
| 123.29° | |
| 0° 16m 47.28s / day | |
| Inclination | 24.981° |
| 310.18° | |
| 38.959° | |
| Earth MOID | 0.5806 AU |
| Physical characteristics | |
| Dimensions | 4.71 km (calculated)[4] |
| 4.8341±0.0003 h[5] | |
| 0.20 (assumed)[4] | |
| S [4] | |
|
14.0[1][4] 14.24±0.23[6] | |
|
| |
5642 Bobbywilliams, provisional designation 1990 OK1, is an eccentric stony asteroid and Mars-crosser from the inner regions of the asteroid belt, approximately 4.7 kilometers in diameter. It was discovered by American astronomer Henry E. Holt at the U.S. Palomar Observatory, California, on 27 July 1990.[3]
The S-type asteroid orbits the Sun at a distance of 1.5–3.1 AU once every 3 years and 6 months (1,286 days). Its orbit has an eccentricity of 0.33 and an inclination of 25° with respect to the ecliptic.[1] The first precovery was taken at the Australian Siding Spring Observatory in 1975, extending the asteroid's observation arc by 15 years prior to its discovery.[3]
A rotational light-curve for this asteroid was obtained from photometric observations by astronomer Julian Oey at both the Australian Kingsgrove and Leura observatories in July 2011. It gave a well-defined rotation period of 4.8341±0.0003 hours with a brightness variation of 0.05 in magnitude (U=3).[5] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 4.71 kilometers.[4]
The minor planet was named for Jet Propulsion Laboratory engineer Bobby G. Williams (b. 1951), specialized in celestial mechanics and the navigation of space probes. He has been a leading navigation manager when NEAR Shoemaker had its rendezvous with the asteroids 253 Mathilde and 433 Eros,[2] Naming citation was published on 28 July 1999 (M.P.C. 35483).[7]
References
- 1 2 3 4 "JPL Small-Body Database Browser: 5642 Bobbywilliams (1990 OK1)" (2016-02-21 last obs.). Jet Propulsion Laboratory. Retrieved 1 August 2016.
- 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (5642) Bobbywilliams. Springer Berlin Heidelberg. pp. 478–479. ISBN 978-3-540-00238-3. Retrieved 1 August 2016.
- 1 2 3 "5642 Bobbywilliams (1990 OK1)". Minor Planet Center. Retrieved 1 August 2016.
- 1 2 3 4 5 6 "LCDB Data for (5642) Bobbywilliams". Asteroid Lightcurve Database (LCDB). Retrieved 1 August 2016.
- 1 2 Oey, Julian (July 2012). "Lightcurve Analysis of Asteroids Observed in 2011 from Leura and Kingsgrove Observatories". The Minor Planet Bulletin. 39 (3): 145–147. Bibcode:2012MPBu...39..145O. ISSN 1052-8091. Retrieved 1 August 2016.
- ↑ 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. Retrieved 1 August 2016. - ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 1 August 2016.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- 5642 Bobbywilliams at the JPL Small-Body Database
