+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   20449 (1999 JM108) Classification: Main-belt Asteroid          SPK-ID: 2020449 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 24 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2237819800886161 4.219e-08   a 2.36465693811203 6.9307e-09 au q 1.835489326271036 9.9821e-08 au i 1.195922183952245 3.4683e-06 deg node 296.4830608926977 0.000187 deg peri 68.5656839270368 0.00018714 deg M 219.906901083534 6.8241e-06 deg tp 2459717.350430406101 (2022-May-17.85043041) 2.589e-05 TDB period 1328.160747283797 3.64 5.8392e-06 1.599e-08 d yr n .2710515280143846 1.1917e-09 deg/d Q 2.893824549953024 8.4817e-09 au   Orbit Determination Parameters    # obs. used (total)      1621      data-arc span      15205 days (41.63 yr)      first obs. used      1978-10-04      last obs. used      2020-05-21      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .48734      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:21:18   Additional Information  Earth MOID = .832471 au   Jupiter MOID = 2.5713 au   T_jup = 3.514  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.88   n/a E2021B10   diameter diameter 2.823 km 0.351 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   geometric albedo albedo 0.292   0.068 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   20449 (1999 JM108)          Discovered 1999-May-13 by LINEAR at Socorro Reference: 20010109/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1999 JM108 = 1978 TQ3 = 2000 QF7  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-21 11:12 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin