+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .05196029797613058 2.6791e-08   a 2.777380015158809 1.2393e-08 au q 2.633066521978208 7.2173e-08 au i 4.532093014584287 4.3528e-06 deg node 183.7622326023576 3.7148e-05 deg peri 246.2454625222619 6.2079e-05 deg M 85.86477433812159 4.7713e-05 deg tp 2458597.259710134847 (2019-Apr-23.75971013) 0.00022486 TDB period 1690.64095806987 4.63 1.1316e-05 3.098e-08 d yr n .2129369919033525 1.4253e-09 deg/d Q 2.921693508339411 1.3037e-08 au   Orbit Determination Parameters    # obs. used (total)      1950      data-arc span      14110 days (38.63 yr)      first obs. used      1981-10-24      last obs. used      2020-06-11      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .46549      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 02:01:59   Additional Information  Earth MOID = 1.65099 au   Jupiter MOID = 2.22873 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 14.0   n/a MPO319342   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-Jan-23 11:56 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin