+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   20577 (1999 RM148) Classification: Main-belt Asteroid          SPK-ID: 2020577 [ 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 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .05204191414501597 2.6838e-08   a 2.776790091184875 1.2343e-08 au q 2.6322806196607 7.228e-08 au i 4.532651912110651 4.3465e-06 deg node 183.7615382074825 3.7071e-05 deg peri 246.0224270328467 6.1663e-05 deg M 128.6818695331037 4.7215e-05 deg tp 2458596.373530808924 (2019-Apr-22.87353081) 0.0002228 TDB period 1690.102340740694 4.63 1.1269e-05 3.085e-08 d yr n .2130048526187051 1.4202e-09 deg/d Q 2.921299562709049 1.2985e-08 au   Orbit Determination Parameters    # obs. used (total)      1968      data-arc span      14379 days (39.37 yr)      first obs. used      1981-10-24      last obs. used      2021-03-07      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .46436      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:24:12   Additional Information  Earth MOID = 1.64955 au   Jupiter MOID = 2.22912 au   T_jup = 3.328  [ 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 14.07   n/a E2021B10   diameter diameter 10.794 km 0.097 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.041   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   20577 (1999 RM148)          Discovered 1999-Sep-09 by LINEAR at Socorro Reference: 20010109/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1999 RM148 = 1981 UO16 = 1997 EA42 = 1998 KC40  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-18 00:45 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin