+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   120670 (1996 XM21) Classification: Main-belt Asteroid          SPK-ID: 2120670 [ 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 18 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1394349602317488 7.7506e-08   a 2.575182591045243 1.5726e-08 au q 2.216112108873358 1.9159e-07 au i 6.37530120282694 7.1513e-06 deg node 3.684051730036768 4.0374e-05 deg peri 178.0425111097749 4.4885e-05 deg M 183.7324815711675 2.4481e-05 deg tp 2459939.560953648085 (2022-Dec-26.06095365) 0.00010762 TDB period 1509.421280136376 4.13 1.3827e-05 3.786e-08 d yr n .238502003872288 2.1847e-09 deg/d Q 2.934253073217129 1.7919e-08 au   Orbit Determination Parameters    # obs. used (total)      516      data-arc span      8784 days (24.05 yr)      first obs. used      1996-12-08      last obs. used      2020-12-26      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .623      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 09:25:40   Additional Information  Earth MOID = 1.21834 au   Jupiter MOID = 2.02437 au   T_jup = 3.405  [ 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 15.6   n/a MPO270617   diameter diameter 1.920 km 0.450 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.302   0.222 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   120670 (1996 XM21)          Discovered 1996-Dec-08 by Spacewatch at Kitt Peak Reference: 20060314/Numbers.arc Last Updated: 2006-03-23 [ show close-approach data ] Alternate Designations  1996 XM21 = 1998 FZ60  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-03 03:24 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin