+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   9142 Rhesus (5191 T-3) Classification: Jupiter Trojan          SPK-ID: 2009142 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1306470828523375 3.836e-08   a 5.165739959177126 8.0204e-08 au q 4.490851102736881 2.2798e-07 au i 12.80655708906833 4.2984e-06 deg node 141.1982036429106 1.8555e-05 deg peri 173.3217633028416 2.5726e-05 deg M 266.2817022929396 2.087e-05 deg tp 2460116.898200860186 (2023-Jun-21.39820086) 0.00026523 TDB period 4288.419253686349 11.74 9.9873e-05 2.734e-07 d yr n .08394701606904269 1.9551e-09 deg/d Q 5.840628815617371 9.0682e-08 au   Orbit Determination Parameters    # obs. used (total)      1706      data-arc span      23912 days (65.47 yr)      first obs. used      1954-12-22      last obs. used      2020-06-10      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .46381      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 16:55:43   Additional Information  Earth MOID = 3.47759 au   Jupiter MOID = .425893 au   T_jup = 2.934  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 10.6   n/a MPO358719   diameter diameter 42.306 km 0.460 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   rotation period rot_per 7.325 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] geometric albedo albedo 0.062   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   9142 Rhesus           Discovered 1977 Oct. 16 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels. Named for the king of the Thracians and ally of the Trojans. He and his twelve companions were stealthily assassinated in their sleep by Odysseus and Diomedes. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 19981208/MPCPages.arc Last Updated: 2009-11-17 Alternate Designations  5191 T-3 = 1988 RX  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Sep-25 07:26 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin