+ 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 19 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1394349562768319 7.711e-08   a 2.575182592421499 1.5675e-08 au q 2.216112120242349 1.9064e-07 au i 6.375301226646809 7.1382e-06 deg node 3.684051657104474 4.0373e-05 deg peri 178.0425105389337 4.4875e-05 deg M 183.7324823421457 2.443e-05 deg tp 2459939.560951007964 (2022-Dec-26.06095101) 0.00010738 TDB period 1509.421281346397 4.13 1.3781e-05 3.773e-08 d yr n .2385020036810939 2.1776e-09 deg/d Q 2.93425306460065 1.786e-08 au   Orbit Determination Parameters    # obs. used (total)      519      data-arc span      8784 days (24.05 yr)      first obs. used      1996-12-08      last obs. used      2020-12-26      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .62167      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 17:07:37   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 [ hide close-approach data ] Close-Approach Data   ...sorted by Date/Time (TDB) Date/Time (TDB) Time Uncertainty (days_HH:MM) Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified 1924-Nov-22 01:01 00:02 Amphi 0.0268632695957801 0.0268590733727052 0.0268674887603801 3.51176924681155 3.51176918587355 2424111.542183161 1.93476846326769 1384.46115168412 89.6576798904689 -82.118531124 44370.6209620476 T 19 CATAB v2.0f-lin.ifort 2021-Apr-13 17:07:38 2021-Apr-13 17:07 Alternate Designations  1996 XM21 = 1998 FZ60  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-23 06:54 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin