9321 Alexkonopliv
| Discovery [1] | |
|---|---|
| Discovered by | T. Kojima |
| Discovery site | YGCO Chiyoda Stn. |
| Discovery date | 5 January 1989 |
| Designations | |
| MPC designation | 9321 Alexkonopliv |
Named after |
Alex Konopliv (astronomer)[2] |
|
1989 AK · 1977 VZ1 1977 XD · 1984 EK | |
| main-belt · (outer) [3] | |
| Orbital characteristics [1] | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 38.43 yr (14,036 days) |
| Aphelion | 3.9219 AU |
| Perihelion | 2.2954 AU |
| 3.1087 AU | |
| Eccentricity | 0.2616 |
| 5.48 yr (2,002 days) | |
| 59.316° | |
| 0° 10m 47.28s / day | |
| Inclination | 4.3171° |
| 89.243° | |
| 357.87° | |
| Physical characteristics | |
| Dimensions |
10.28±0.19 km[4] 11.48 km (calculated)[3] |
| 3.4268±0.0010 h[5] | |
|
0.057 (assumed)[3] 0.116±0.023[4] | |
| C [3] | |
| 13.0[1] · 12.93±0.18[6] · 12.90[4] · 12.979±0.002 (R)[5] · 13.43[3] | |
|
| |
9321 Alexkonopliv, provisional designation 1989 AK, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 11 kilometers in diameter. It was discovered on 5 January 1989, by Japanese astronomer Takuo Kojima at the YGCO Chiyoda Station, Japan.[7]
The dark C-type asteroid orbits the Sun at a distance of 2.3–3.9 AU once every 5 years and 6 months (2,002 days). Its orbit has an eccentricity of 0.26 and an inclination of 4° with respect to the ecliptic.[1] The first precovery was taken at Purple Mountain Observatory in 1977, extending the asteroid's observation arc by 12 years prior to its discovery.[7]
A rotational light-curve was obtained from photometric observation made at the Palomar Transient Factory, California, in December 2010. The light-curve gave a rotation period of 3.4268±0.0010 hours with a brightness amplitude of 0.19 in magnitude (U=2).[5] According to the survey carried out by NASA's space-based Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures 10.3 kilometers in diameter and its surface has an albedo of 0.116, [4] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 11.5 kilometers, based on an absolute magnitude of 13.43.[3]
It is named after JPL-scientist Alex Konopliv (b. 1960), an internationally recognized authority on the measurement of the gravitational field of Solar System bodies tracked by satellites in Earth's orbit. Various Mars missions used his gravity field determinations for the Red Planet.[2] Naming citation was published on 5 October 1998 (M.P.C. 32610).[8]
References
- 1 2 3 4 "JPL Small-Body Database Browser: 9321 Alexkonopliv (1989 AK)" (2016-04-19 last obs.). Jet Propulsion Laboratory. Retrieved 4 December 2016.
- 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (9321) Alexkonopliv. Springer Berlin Heidelberg. p. 682. ISBN 978-3-540-29925-7. Retrieved 10 May 2016.
- 1 2 3 4 5 6 "LCDB Data for (9321) Alexkonopliv". Asteroid Lightcurve Database (LCDB). Retrieved 10 May 2016.
- 1 2 3 4 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794
. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 10 May 2016. - 1 2 3 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 10 May 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 10 May 2016.
- 1 2 "9321 Alexkonopliv (1989 AK)". Minor Planet Center. Retrieved 10 May 2016.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 10 May 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
- 9321 Alexkonopliv at the JPL Small-Body Database
