(21601) 1998 XO89

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(21601) 1998 XO89
Discovery[1]
Discovered byLINEAR
Discovery siteLincoln Lab's ETS
Discovery date15 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 arc26.70 yr (9,751 d)
Aphelion5.4048 AU
Perihelion5.0346 AU
5.2197 AU
Eccentricity0.0355
11.93 yr (4,356 d)
206.09°
0° 4m 57.36s / day
Inclination19.472°
263.64°
213.23°
Jupiter MOID0.0528 AU
TJupiter2.8840
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 (see Trojans in astronomy).[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]

100+ largest Jupiter trojans

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[]

  1. ^ 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
  2. ^ 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[]

  1. ^ Jump up to: a b c d e f "21601 (1998 XO89)". Minor Planet Center. Retrieved 19 June 2018.
  2. ^ 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.
  3. ^ Jump up to: a b "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. Retrieved 19 June 2018.
  4. ^ Jump up to: a b "Asteroid (21601) 1998 XO89 – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 19 June 2018.
  5. ^ 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)
  6. ^ 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)
  7. ^ 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.
  8. ^ Jump up to: a b c d e f "LCDB Data for (21601)". Asteroid Lightcurve Database (LCDB). Retrieved 19 June 2018.
  9. ^ Jump up to: a b "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 19 June 2018.

External links[]

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