Astronomy:(20729) 1999 XS143

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(20729) 1999 XS143
Discovery[1]
Discovered byC. W. Juels
Discovery siteFountain Hills Obs.
Discovery date15 December 1999
Designations
(20729) 1999 XS143
1999 XS143
Minor planet categoryJupiter trojan[1][2]
Greek[3] · background[4]
Orbital characteristics[2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc65.26 yr (23,838 d)
|{{{apsis}}}|helion}}5.5498 AU
|{{{apsis}}}|helion}}4.8840 AU
5.2169 AU
Eccentricity0.0638
Orbital period11.92 yr (4,352 d)
Mean anomaly252.20°
Mean motion0° 4m 57.72s / day
Inclination22.008°
Longitude of ascending node306.91°
92.027°
Jupiter MOID0.1123 AU
TJupiter2.8500
Physical characteristics
Mean diameter50.96±0.96 km[5]
Rotation period5.72±0.02 h[6]
Geometric albedo0.052±0.017[5]
C (assumed)[7]
V–I = 1.000±0.060[7]
Absolute magnitude (H)10.3[5]
10.4[1][2][7]


(20729) 1999 XS143 (provisional designation 1999 XS143) is a Jupiter trojan from the Greek camp, approximately 51 kilometers (32 miles) in diameter. It was discovered on 15 December 1999, by American astronomer Charles Juels at the Fountain Hills Observatory in Arizona.[1] The dark Jovian asteroid has a short rotation period of 5.72 hours and belongs to the 90 largest Jupiter trojans.[7] It has not been named since its numbering in January 2001.[8]

Orbit and classification

1999 XS143 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 4.9–5.5 AU once every 11 years and 11 months (4,352 days; semi-major axis of 5.22 AU). Its orbit has an eccentricity of 0.06 and an inclination of 22° 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 Palomar Observatory in February 1953, almost 47 years prior to its official discovery observation at Fountain Hills.[1]

Numbering and naming

This minor planet was numbered on 9 January 2001 (M.P.C. 41908).[8] (As of 2021), it has not been named.[1]

Physical characteristics

1999 XS143 is an assumed, carbonaceous C-type asteroid. It has a high V–I color index of 1.00 (see table below).[7]

Rotation period

In September 2008, a rotational lightcurve of 1999 XS143 was obtained from photometric observations. Lightcurve analysis gave a rotation period of 5.72±0.02 hours with a brightness variation of 0.33 magnitude ({{{1}}}).[6][7]

Observations by Stefano Mottola at the Calar Alto Observatory in October 2009 showed a divergent period of 7.631 hours with an amplitude of 0.20 magnitude ({{{1}}}).[7][9]

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, 1999 XS143 between 50.96 kilometers in diameter and its surface has an albedo of 0.052,[5] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 46.30 kilometers based on an absolute magnitude of 10.4.[7] The object was neither observed by IRAS nor the Akari satellite.

100+ largest Jupiter trojans

References

  1. ↑ Jump up to: 1.0 1.1 1.2 1.3 1.4 1.5 "20729 (1999 XS143)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=20729. Retrieved 20 June 2018. 
  2. ↑ Jump up to: 2.0 2.1 2.2 2.3 "JPL Small-Body Database Browser: 20729 (1999 XS143)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2020729. Retrieved 20 June 2018. 
  3. ↑ Jump up to: 3.0 3.1 "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. https://www.minorplanetcenter.net/iau/lists/JupiterTrojans.html. Retrieved 20 June 2018. 
  4. ↑ Jump up to: 4.0 4.1 "Asteroid (20729) 1999 XS143 – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. https://newton.spacedys.com/astdys/index.php?n=20729&pc=1.1.6. 
  5. ↑ Jump up to: 5.0 5.1 5.2 5.3 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. doi:10.1088/0004-637X/759/1/49. Bibcode: 2012ApJ...759...49G.  (online catalog)
  6. ↑ Jump up to: 6.0 6.1 Melita, M. D.; Duffard, R.; Williams, I. P.; Jones, D. C.; Licandro, J.; Ortiz, J. L. (June 2010). "Lightcurves of 6 Jupiter Trojan asteroids". Planetary and Space Science 58 (7–8): 1035–1039. doi:10.1016/j.pss.2010.03.009. Bibcode: 2010P&SS...58.1035M. 
  7. ↑ Jump up to: 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 "LCDB Data for (20729)". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=20729%7C. Retrieved 20 June 2018. 
  8. ↑ Jump up to: 8.0 8.1 "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. Retrieved 20 June 2018. 
  9. ↑ 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. doi:10.1088/0004-6256/141/5/170. Bibcode: 2011AJ....141..170M. 

External links



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