(9799) 1996 RJ
| Discovery [1] | |
|---|---|
| Discovered by | T. B. Spahr |
| Discovery site | Catalina Stn. |
| Discovery date | 8 September 1996 |
| Designations | |
| MPC designation | (9799) 1996 RJ |
| 1996 RJ · 1986 XP5 | |
|
Jupiter trojan [1][2][3] Greek [4][5] · 006 [5][6][7] | |
| Orbital characteristics [2] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 31.48 yr (11,497 d) |
| Aphelion | 5.4384 AU |
| Perihelion | 4.9443 AU |
| 5.1913 AU | |
| Eccentricity | 0.0476 |
| 11.83 yr (4,320 d) | |
| 271.25° | |
| 0° 4m 59.88s / day | |
| Inclination | 30.521° |
| 259.55° | |
| 113.22° | |
| Jupiter MOID | 0.0102 AU |
| TJupiter | 2.7210 |
| Physical characteristics | |
Mean diameter |
64.87±3.1 km[8] 65.06 km (derived)[3] 68.03±0.57 km[9] 72.42±4.03 km[10] |
| 21.52±0.03 h[11] | |
|
0.037±0.004[10] 0.0460±0.005[8] 0.060±0.012[9] 0.0603 (derived)[3] | |
|
C (assumed)[3] V–I = 0.910±0.055[3] | |
|
9.5[9] 9.6[1][2][3] 9.68±0.45[12] 9.90[10] | |
|
| |
(9799) 1996 RJ, provisional designation 1996 RJ, is a large Jupiter trojan from the Greek camp and the parent body of a small, unnamed asteroid family (006), approximately 68 kilometers (42 miles) in diameter. It was discovered on 8 September 1996, by American astronomer Timothy Spahr at the Catalina Station of the Steward Observatory near Tucson, Arizona, in the United States.[1] The assumed C-type asteroid belongs to the 50 largest Jupiter trojans and has a relatively long rotation period of 21.52 hours.[3]
Orbit and classification
1996 RJ is a dark Jovian asteroid orbiting in the leading Greek camp at Jupiter's L4 Lagrangian point, 60° ahead of the Gas Giant's orbit in a 1:1 resonance (see Trojans in astronomy). It orbits the Sun at a distance of 4.9–5.4 AU once every 11 years and 10 months (4,320 days; semi-major axis of 5.19 AU). Its orbit has an eccentricity of 0.05 and an inclination of 31° with respect to the ecliptic.[2] The body's observation arc begins in December 1986, with its first observation as 1986 XP5 at the Observatory of the University of St Andrews (482), Scotland, almost 10 years prior to its official discovery observation at Catalina Station.[1]
Parent of a small Trojan family
1996 RJ is also the parent body of a small, unnamed asteroid family with the family identification number 006.[5][6] The family seems to be young, compact and consist of only 7 known members.[13]:23 Only a few families have been identified among the Jovian asteroids; four of them in the Greek camp. This potentially collisional family was first characterized by Jakub Rozehnal and Miroslav Brož in 2014.[7]
The other members of this family include the unnamed Jovian asteroids (89938), (226027), (243316), (254691), (388876) and (392189).[13]
Physical characteristics
1996 RJ is an assumed, carbonaceous C-type asteroid.[3] Nesvorný does not give an overall spectral type for this unnamed family, but derives an albedo of 0.06 (see below), which is also typical for carbonaceous C-types.[13]:23
Rotation period
In October 2009, a rotational lightcurve of 1996 RJ was obtained from photometric observations by Stefano Mottola using a 1.2-meter telescope at the Calar Alto Observatory in Spain. Lightcurve analysis gave a longer-than average rotation period of 21.52 hours with a brightness amplitude of 0.16 magnitude (U=2+).[3][11]
Diameter and albedo
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, 1996 RJ measures between 64.87 and 72.42 kilometers in diameter and its surface has an albedo between 0.037 and 0.060.[8][9][10]
The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0603 and a diameter of 65.06 kilometers based on an absolute magnitude of 9.6.[3]
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Numbering and naming
This minor planet was numbered on 8 December 1998 after its orbit had been sufficiently secured (M.P.C. 33211).[14] As of 2018, it has not been named.[1]
References
- 1 2 3 4 5 6 "9799 (1996 RJ)". Minor Planet Center. Retrieved 5 June 2018.
- 1 2 3 4 "JPL Small-Body Database Browser: 9799 (1996 RJ)" (2018-05-24 last obs.). Jet Propulsion Laboratory. Retrieved 5 June 2018.
- 1 2 3 4 5 6 7 8 9 10 "LCDB Data for (9799)". Asteroid Lightcurve Database (LCDB). Retrieved 5 June 2018.
- ↑ "List of Jupiter Trojans". Minor Planet Center. 30 May 2018. Retrieved 5 June 2018.
- 1 2 3 "Asteroid (9799) 1996 RJ". AstDyS-2, Asteroids – Dynamic Site. Retrieved 5 June 2018.
- 1 2 "Asteroid (9799) 1996 RJ". Small Bodies Data Ferret. Retrieved 5 June 2018.
- 1 2 Rozehnal, J.; Brož, M. (July 2014). "Long-term evolution of asteroid families among Jovian Trojans". Asteroids. Bibcode:2014acm..conf..452R. Retrieved 5 June 2018.
- 1 2 3 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. Bibcode:2004PDSS...12.....T. Retrieved 15 June 2018.
- 1 2 3 4 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" (PDF). The Astrophysical Journal. 759 (1): 10. arXiv:1209.1549. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. Retrieved 9 June 2018. (online catalog)
- 1 2 3 4 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. Retrieved 15 June 2018. (online, AcuA catalog p. 153)
- 1 2 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. Retrieved 5 June 2018.
- ↑ 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" (PDF). Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 5 June 2018.
- 1 2 3 Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families" (PDF). Asteroids IV: 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. Retrieved 5 June 2018.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 5 June 2018.
External links
- Long-term evolution of asteroid families among Jovian Trojans, Jakub Rozehnal and Miroslav Brož (2014)
- Asteroid Lightcurve Database (LCDB), query form (info)
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- (9799) 1996 RJ at AstDyS-2, Asteroids—Dynamic Site
- (9799) 1996 RJ at the JPL Small-Body Database