It orbits the Sun at a distance of 4.8–5.7 AU once every 11 years and 11 months (4,364 days; semi-major axis of 5.23 AU). Its orbit has an eccentricity of 0.08 and an inclination of 20° with respect to the ecliptic.[3] The body's observation arc begins with a precovery at Palomar in February 1953, or 36 years prior to its official discovery observation.[1]
Physical characteristics
In the SDSS-based taxonomy, Orsilocus is a D-type asteroid,[10][11] the most common spectral type among the larger Jupiter trojans. It has also been characterized as a D-type by Pan-STARRS' survey, while the Collaborative Asteroid Lightcurve Link (CALL) assumes it to be a carbonaceous C-type asteroid.[7][9] Its V–I color index of 0.97 is typical for most larger Jovian asteroids.[7]
In 2015 and 2016, follow-up observations by Stephens at the CS3 gave two concurring periods of 10.28±0.01 and 10.36±0.03 hours with an amplitude of 0.20 and 0.16 magnitude, respectively (U=2+/2+).[7][12][13][a]
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Orsilocus measures 50.16 kilometers in diameter and its surface has an albedo of 0.070,[6] while CALL assumes a standard albedo for a carbonaceous asteroid of 0.057, and calculates a diameter of 53.16 kilometers based on an absolute magnitude of 10.1.[7]
100+ largest Jupiter trojans
Largest Jupiter Trojans by survey(A) (mean-diameter in kilometers; YoD: Year of Discovery)
Note: missing data was completed with figures from the JPL SBDB (query) and from the LCDB (query form) for the WISE/NEOWISE and SIMPS catalogs, respectively. These figures are given in italics. Also, listing is incomplete above #100.
^ abcLightcurve plot of (5284) Orsilocus from Feb 2013, May 2015 and May 2016 by Robert Stephens at the Center for Solar System Studies (U81). Quality code is n.a./2+/2+ (lightcurve rating at CS3). Summary figures at the LCDB and CS3.
^ abFrench, 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. ISSN1052-8091.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^ abcVeres, 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". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. S2CID53493339.
^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. ISSN1052-8091.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^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. ISSN1052-8091.{{cite journal}}: CS1 maint: multiple names: authors list (link)
