+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21601 (1998 XO89) Classification: Jupiter Trojan          SPK-ID: 2021601 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 33 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .03512284709337913 2.4012e-08   a 5.229406324273334 8.7297e-08 au q 5.045734685556732 1.9713e-07 au i 19.46893626470791 1.3241e-06 deg node 263.6387403551072 1.9614e-06 deg peri 210.4315995998024 4.081e-05 deg M 291.4672619612903 4.3473e-05 deg tp 2460032.019792257683 (2023-Mar-28.51979226) 0.0005329 TDB period 4367.943464387544 11.96 0.00010937 2.994e-07 d yr n .0824186491732621 2.0638e-09 deg/d Q 5.413077962989935 9.0363e-08 au   Orbit Determination Parameters    # obs. used (total)      2234      data-arc span      10936 days (29.94 yr)      first obs. used      1991-03-16      last obs. used      2021-02-22      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .37613      source      ORB      producer      Otto Matic      solution date      2021-Mar-17 03:02:06   Additional Information  Earth MOID = 4.07291 au   Jupiter MOID = .0493236 au   T_jup = 2.884  [ 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 10.11   n/a E2021B10   diameter diameter 54.909 km 0.432 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   rotation period rot_per 12.65 h n/a LCDB (Rev. 2020-October); 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: [French, L.M.; Stephens, R.D.; Coley, D.R.; Wasserman, L.H.; et al. (2013) Minor Planet Bull. 40, 198-203.] [Stephens, R.D.; Warner, B.D. (2018) Minor Planet Bull. 45, 48-50.] geometric albedo albedo 0.064   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)   21601 (1998 XO89)          Discovered 1998-Dec-15 by LINEAR at Socorro Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1998 XO89 = 2000 AK195  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-10 19:05 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin