+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   22820 (1999 RM31) Classification: Main-belt Asteroid          SPK-ID: 2022820 [ 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 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1011422109522346 6.5678e-08   a 2.70787740647418 1.3614e-08 au q 2.433996698595779 1.7879e-07 au i 14.587316187916 6.0973e-06 deg node 6.417908964742367 1.5613e-05 deg peri 2.141527639350699 2.5102e-05 deg M 274.1305242301564 2.1483e-05 deg tp 2459588.720295362880 (2022-Jan-09.22029536) 9.8163e-05 TDB period 1627.578427347506 4.46 1.2274e-05 3.36e-08 d yr n .2211874979116666 1.6681e-09 deg/d Q 2.981758114352581 1.4991e-08 au   Orbit Determination Parameters    # obs. used (total)      1296      data-arc span      10879 days (29.79 yr)      first obs. used      1990-09-14      last obs. used      2020-06-27      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .50828      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 04:13:24   Additional Information  Earth MOID = 1.43147 au   Jupiter MOID = 2.47908 au   T_jup = 3.311  [ 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 14.35   n/a E2021B10   diameter diameter 3.161 km 0.769 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.369   0.203 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   22820 (1999 RM31)          Discovered 1999-Sep-09 by Korlevic, K. at Visnjan Reference: 20010309/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1999 RM31 = 1990 RC13 = 2000 XZ34  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-21 06:20 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin