(21601) 1998 XO89
Discovery[1] | |
---|---|
Discovered by | LINEAR |
Discovery site | Lincoln Lab's ETS |
Discovery date | 15 December 1998 |
Designations | |
(21601) 1998 XO89 | |
1998 XO89 · 2000 AK195 | |
Minor planet category | Jupiter trojan[1][2] Greek[3] · background[4] |
Orbital characteristics[2] | |
Epoch 23 March 2018 (JD 2458200.5) | |
Uncertainty parameter 0 | |
Observation arc | 26.70 yr (9,751 d) |
Aphelion | 5.4048 AU |
Perihelion | 5.0346 AU |
5.2197 AU | |
Eccentricity | 0.0355 |
11.93 yr (4,356 d) | |
206.09° | |
0° 4m 57.36s / day | |
Inclination | 19.472° |
263.64° | |
213.23° | |
Jupiter MOID | 0.0528 AU |
TJupiter | 2.8840 |
Physical characteristics | |
Mean diameter | 54.91±0.43 km[5] 56.08±1.94 km[6] |
12.65±0.01 h[7][a] | |
0.064±0.012[5] 0.100±0.007[6] V–I = 0.970±0.039[8] | |
C (assumed)[8] | |
Absolute magnitude (H) | 9.40[6] 9.9[5] 10.0[1][2][8] |
(21601) 1998 XO89, provisional designation 1998 XO89, is a Jupiter trojan from the Greek camp, approximately 55 kilometers (34 miles) in diameter. It was discovered on 15 December 1998, by astronomers with the Lincoln Near-Earth Asteroid Research at the Lincoln Lab's ETS near Socorro, New Mexico.[1] The dark Jovian asteroid has a rotation period of 12.7 hours and belongs to the 80 largest Jupiter trojans.[8] It has not been named since its numbering in February 2001.[9]
Orbit and classification[]
1998 XO89 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 .[3] It is also a non-family asteroid in the Jovian background population.[4]
It orbits the Sun at a distance of 5.0–5.4 AU once every 11 years and 11 months (4,356 days; semi-major axis of 5.22 AU). Its orbit has an eccentricity of 0.04 and an inclination of 19° with respect to the ecliptic.[2] The body's observation arc begins with a precovery published by the Digitized Sky Survey and taken at the Siding Spring Observatory in March 1991, more than 7 years prior to its official discovery observation at Socorro.[1]
Physical characteristics[]
1998 XO89 is an assumed C-type asteroid. Its V–I color index of 0.97 is typical for that of D-type asteroids, the dominant spectral type among the Jupiter trojans.[8]
Rotation period[]
In April 2013, a rotational lightcurve of 1998 XO89 was obtained from photometric observations by Robert Stephens at the Center for Solar System Studies (CS3) in California. Lightcurve analysis gave a rotation period of 12.65±0.01 hours and a brightness variation of 0.30 magnitude (U=2+).[7] Observations by his college Brian Warner at CS3 in July 2017, gave a similar period of 12.530 hours with an amplitude of 0.25 magnitude (U=2+).[a][b]
Diameter and albedo[]
According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, 1998 XO89 measures 54.91 and 56.08 kilometers in diameter and its surface has an albedo of 0.064 and 0.100, respectively.[5][6] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 55.67 kilometers based on an absolute magnitude of 10.0.[8]
Numbering and naming[]
This minor planet was numbered on 8 February 2001 (M.P.C. 22480).[9] As of 2018, it has not been named.[1]
Notes[]
- ^ Jump up to: a b Lightcurve plots of (21601) 1998 XO89 from 2013 and 2017 by Robert Stephens and Brian Warner at the Center for Solar System Studies (U81), Landers. Quality code is n.a/2+ (lightcurve rating at CS3). Summary figures at the LCDB and CS3 website
- ^ Unpublished /Not available at ADS: observations from July 2017 by Brian Warner / Robert Stephens. Rotation period 12.530±0.005 hours with a brightness amplitude of 0.25±0.02 mag. Quality code of 2+. Summary figures for (21601) 1998 XO89 at the LCDB
References[]
- ^ Jump up to: a b c d e f "21601 (1998 XO89)". Minor Planet Center. Retrieved 19 June 2018.
- ^ Jump up to: a b c d "JPL Small-Body Database Browser: 21601 (1998 XO89)" (2017-11-25 last obs.). Jet Propulsion Laboratory. Retrieved 19 June 2018.
- ^ Jump up to: a b "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. Retrieved 19 June 2018.
- ^ Jump up to: a b "Asteroid (21601) 1998 XO89 – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 19 June 2018.
- ^ Jump up to: a b c d 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. S2CID 119101711. Retrieved 19 June 2018. (online catalog)
- ^ Jump up to: 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)
- ^ Jump up to: a b French, Linda M.; Stephens, Robert, D.; Coley, Daniel R.; Wasserman, Lawrence H.; Vilas, Faith; La Rocca, Daniel (October 2013). "A Troop of Trojans: Photometry of 24 Jovian Trojan Asteroids". The Minor Planet Bulletin. 40 (4): 198–203. Bibcode:2013MPBu...40..198F. ISSN 1052-8091. Retrieved 19 June 2018.
- ^ Jump up to: a b c d e f "LCDB Data for (21601)". Asteroid Lightcurve Database (LCDB). Retrieved 19 June 2018.
- ^ Jump up to: a b "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 19 June 2018.
External links[]
- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Discovery Circumstances: Numbered Minor Planets (20001)-(25000) – Minor Planet Center
- Small Bodies Data Ferret at the Asteroid (21601) 1998 XO89
- (21601) 1998 XO89 at AstDyS-2, Asteroids—Dynamic Site
- (21601) 1998 XO89 at the JPL Small-Body Database
- Minor planet object articles (numbered)
- Jupiter trojans (Greek camp)
- Discoveries by LINEAR
- Astronomical objects discovered in 1998