(5258) 1989 AU1
Discovery [1] | |
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Discovered by | Y. Oshima |
Discovery site | Gekko Obs. |
Discovery date | 1 January 1989 |
Designations | |
MPC designation | (5258) 1989 AU1 |
1989 AU1 | |
Jupiter trojan [1][2] Greek [3] · Eurybates [4] | |
Orbital characteristics [2] | |
Epoch 23 March 2018 (JD 2458200.5) | |
Uncertainty parameter 0 | |
Observation arc | 29.39 yr (10,734 d) |
Aphelion | 5.5669 AU |
Perihelion | 4.7879 AU |
5.1774 AU | |
Eccentricity | 0.0752 |
11.78 yr (4,303 d) | |
156.16° | |
0° 5m 1.32s / day | |
Inclination | 5.9179° |
248.11° | |
230.22° | |
Jupiter MOID | 0.0912 AU |
TJupiter | 2.9840 |
Physical characteristics | |
Mean diameter |
km 50.77(calculated)[5] ±4.43 km 53.28[6] |
±0.05 h 19.85[7] | |
±0.014 0.052[6] 0.057(assumed)[5] | |
C (assumed)[5] V–R = ±0.041 0.466[8] V–I = ±0.050 1.010[5] | |
10.2[1][2][5][6] | |
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(5258) 1989 AU1, provisional designation 1989 AU1, is a Jupiter trojan and member of the Eurybates family from the Greek camp, approximately 53 kilometers (33 miles) in diameter. It was discovered on 1 January 1989, by Japanese astronomer Yoshiaki Oshima at the Gekko Observatory, east of Shizuoka, Japan.[1] The assumed C-type asteroid belongs to the 90 largest Jupiter trojans and has a rotation period of 19.9 hours.[5] It has not yet been named since its numbering in July 1992.[9]
Orbit and classification
1989 AU1 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).[3][10] It orbits the Sun at a distance of 4.8–5.6 AU once every 11 years and 9 months (4,303 days; semi-major axis of 5.18 AU). Its orbit has an eccentricity of 0.08 and an inclination of 6° with respect to the ecliptic.[2] The body's observation arc begins with its official discovery observation at Gekko Observatory in January 1989.[1]
Eurybates family
1989 AU1 is the member of the small Eurybates family (005),[4] named after its parent body, 3548 Eurybates. This asteroid family comprises 218 known members of carbonaceous and/or primitive composition,[11]:23 and is one of only a few families identified among the Jovian asteroids; with four of them in the Greek camp. This potentially collisional family was first characterized by Jakub Rozehnal and Miroslav Brož in 2011, and further described in 2014.[12][13] Other members of this family include the Jupiter trojans 8060 Anius, 9818 Eurymachos, (163189) 2002 EU6, (287577) 2003 FE42 and 360072 Alcimedon.[11] In the HCM analysis by Milani and Knežević, however, 1989 AU1 belongs to the background population.[10]
Physical characteristics
1989 AU1 is an assumed, carbonaceous C-type asteroid.[5] The overall spectral type of members of the Eurybates family is that of a C- and P-type.[11]:23 It has a high V–I color index of 1.01.[5]
Rotation period
In April 2015, the so-far only lightcurve was obtained by Robert Stephens at the Center for Solar System Studies in Landers, California. The photometric observations gave a rotation period of ±0.05 hours and a brightness variation of 0.14 magnitude ( 19.85U=2+).[5][7][lower-alpha 1]
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, 1989 AU1 measures 53.28 kilometers in diameter and its surface has an albedo of 0.052,[6] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 50.77 kilometers based on an absolute magnitude of 10.2.[5]
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Numbering and naming
This minor planet was numbered by the Minor Planet Center on 14 July 1992 (M.P.C. 20492).[9] As of 2018, it has not been named.[1]
Notes
References
- 1 2 3 4 5 6 "5258 (1989 AU1)". Minor Planet Center. Retrieved 20 June 2018.
- 1 2 3 4 "JPL Small-Body Database Browser: 5258 (1989 AU1)" (2018-05-23 last obs.). Jet Propulsion Laboratory. Retrieved 20 June 2018.
- 1 2 "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. Retrieved 20 June 2018.
- 1 2 "Asteroid (5258) 1989 AU1". Small Bodies Data Ferret. Retrieved 20 June 2018.
- 1 2 3 4 5 6 7 8 9 10 "LCDB Data for (5258)". Asteroid Lightcurve Database (LCDB). Retrieved 20 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". The Astrophysical Journal. 759 (1): 10. arXiv:1209.1549. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. Retrieved 20 June 2018. (online catalog)
- 1 2 Stephens, Robert D.; Coley, Daniel, R.; French, Linda M. (January 2016). "Large L5 Jovian Trojan Asteroid Lightcurves from the Center for Solar System Studies". The Minor Planet Bulletin. 43 (1): 15–22. Bibcode:2016MPBu...43...15S. ISSN 1052-8091. Retrieved 20 June 2018.
- ↑ Hainaut, O. R.; Boehnhardt, H.; Protopapa, S. (October 2012). "Colours of minor bodies in the outer solar system. II. A statistical analysis revisited" (PDF). Astronomy and Astrophysics. 546: 20. arXiv:1209.1896. Bibcode:2012A&A...546A.115H. doi:10.1051/0004-6361/201219566. Retrieved 20 June 2018.
- 1 2 "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 20 June 2018.
- 1 2 "Asteroid (5258) 1989 AU1 – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 20 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 20 June 2018.
- ↑ Broz, M.; Rozehnal, J. (June 2011). "Eurybates – the only asteroid family among Trojans?" (PDF). Monthly Notices of the Royal Astronomical Society. 414 (1): 565–574. arXiv:1109.1109. Bibcode:2011MNRAS.414..565B. doi:10.1111/j.1365-2966.2011.18420.x. Retrieved 20 June 2018.
- ↑ Rozehnal, J.; Brož, M. (July 2014). "Long-term evolution of asteroid families among Jovian Trojans". Asteroids. Bibcode:2014acm..conf..452R. Retrieved 20 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
- (5258) 1989 AU1 at AstDyS-2, Asteroids—Dynamic Site
- (5258) 1989 AU1 at the JPL Small-Body Database