(15440) 1998 WX4
Discovery [1][2] | |
---|---|
Discovered by | CSS |
Discovery site | Catalina Stn. |
Discovery date | 19 November 1998 |
Designations | |
MPC designation | (15440) 1998 WX4 |
1998 WX4 · 1992 LD | |
Jupiter trojan [1][3][4] Greek [5][6] · background [6] | |
Orbital characteristics [3] | |
Epoch 23 March 2018 (JD 2458200.5) | |
Uncertainty parameter 0 | |
Observation arc | 66.48 yr (24,280 d) |
Aphelion | 5.4151 AU |
Perihelion | 5.1821 AU |
5.2986 AU | |
Eccentricity | 0.0220 |
12.20 yr (4,455 d) | |
240.92° | |
0° 4m 50.88s / day | |
Inclination | 28.743° |
120.55° | |
279.64° | |
Jupiter MOID | 0.0063 AU |
TJupiter | 2.7510 |
Physical characteristics | |
Mean diameter |
±0.83 km 62.52[7] ±3.8 km 66.48[8] ±3.87 km 71.88[9] |
±0.02 h 21.43[4][10][lower-alpha 1] | |
±0.011 0.072[7] ±0.009 0.079[9] ±0.011 0.0916[8] | |
C (assumed)[4] V–I = ±0.041 0.970[4] | |
9.10[9] 9.5[7] 9.6[1][3][4] ±0.31 9.68[11] | |
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(15440) 1998 WX4, provisional designation 1998 WX4, is a dark Jupiter trojan from the Greek camp, approximately 66 kilometers (41 miles) in diameter. It was discovered on 19 November 1998, by astronomers with the Catalina Sky Survey at the Catalina Station near Tucson, Arizona, in the United States.[1] The assumed C-type asteroid belongs to the 60 largest Jupiter trojans. It has a rotation period of 21.43 hours and possibly a spherical shape.[4] It has not yet been named since its numbering in June 2000.[12]
Orbit and classification
1998 WX4 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 . It is also a non-family asteroid in the Jovian background population.[6]
It orbits the Sun at a distance of 5.2–5.4 AU once every 12 years and 2 months (4,455 days; semi-major axis of 5.3 AU). Its orbit has an eccentricity of 0.02 and an inclination of 29° with respect to the ecliptic.[3]
The body's observation arc begins with a precovery published by the Digitized Sky Survey and taken at the Palomar Observatory in November 1951, or 47 years prior to its official discovery observation at Catalina.[1]
Physical characteristics
1998 WX4 is an assumed C-type asteroid, while the majority of large Jupiter trojans are D-types. It has a typical V–I color index of 0.97.[4]
Rotation period
Since January 2013, a large number of a rotational lightcurve of 1998 WX4 have been obtained from photometric observations by Robert Stephens at the Center for Solar System Studies in California.[13][14][10][lower-alpha 1] Analysis of the best-rated lightcurve from June 2017 gave a longer-than-average rotation period of ±0.02 h hours with a low brightness amplitude of 21.43±0.02 0.09magnitude (U=2+), indicative of a rather spherical shape.[4][10]
Diameter and albedo
According to the surveys carried out by the Japanese Akari satellite, the Infrared Astronomical Satellite IRAS and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, 1998 WX4 measures between 62.52 and 71.88 kilometers in diameter and its surface has an albedo between 0.072 and 0.092.[7][8][9] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0585 and a diameter of 66.04 kilometers based on an absolute magnitude of 9.6.[4]
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Naming
This minor planet was numbered on 21 June 2000 (M.P.C. 40826).[12] As of 2018, it has not been named.[1]
Notes
References
- 1 2 3 4 5 6 "15440 (1998 WX4)". Minor Planet Center. Retrieved 14 June 2018.
- ↑ "Asteroid (15440) 1998 WX4". Small Bodies Data Ferret. Retrieved 14 June 2018.
- 1 2 3 4 "JPL Small-Body Database Browser: 15440 (1998 WX4)" (2018-05-20 last obs.). Jet Propulsion Laboratory. Retrieved 14 June 2018.
- 1 2 3 4 5 6 7 8 9 "LCDB Data for (15440)". Asteroid Lightcurve Database (LCDB). Retrieved 14 June 2018.
- ↑ "List of Jupiter Trojans". Minor Planet Center. 30 May 2018. Retrieved 14 June 2018.
- 1 2 3 "Asteroid (15440) 1998 WX4 – Proper elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 5 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 14 June 2018. (online catalog)
- 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 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 14 June 2018. (online, AcuA catalog p. 153)
- 1 2 3 Stephens, Robert D.; Warner, Brian D. (October 2017). "Lightcurve Analysis of L4 Trojan Asteroids at the Center for Solar System Studies 2017 April-June". The Minor Planet Bulletin. 44 (4): 312–316. Bibcode:2017MPBu...44..312S. ISSN 1052-8091. Retrieved 14 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 14 June 2018.
- 1 2 "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 14 June 2018.
- ↑ 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 14 June 2018.
- ↑ Stephens, Robert D.; Coley, Daniel R.; Warner, Brian D.; French, Linda, M. (October 2016). "Lightcurves of Jovian Trojan Asteroids from the Center for Solar System Studies: L4 Greek Camp and Spies". The Minor Planet Bulletin. 43 (4): 323–331. Bibcode:2016MPBu...43..323S. ISSN 1052-8091. Retrieved 14 June 2018.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Discovery Circumstances: Numbered Minor Planets (15001)-(20000) – Minor Planet Center
- (15440) 1998 WX4 at AstDyS-2, Asteroids—Dynamic Site
- (15440) 1998 WX4 at the JPL Small-Body Database