+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   12955 (2162 T-2) Classification: Main-belt Asteroid          SPK-ID: 2012955 [ 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 28 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08098092443401245 3.2044e-08   a 2.626249915097092 1.0906e-08 au q 2.413573769177783 8.2819e-08 au i 4.446446740769495 4.144e-06 deg node 192.8324887932491 4.4092e-05 deg peri 85.29430866121619 5.0942e-05 deg M 111.4358863501685 2.5783e-05 deg tp 2458719.300602477107 (2019-Aug-23.80060248) 0.00011105 TDB period 1554.54215676887 4.26 9.6833e-06 2.651e-08 d yr n .231579438635658 1.4425e-09 deg/d Q 2.838926061016401 1.1789e-08 au   Orbit Determination Parameters    # obs. used (total)      1132      data-arc span      17282 days (47.32 yr)      first obs. used      1973-09-19      last obs. used      2021-01-12      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .53943      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 02:08:53   Additional Information  Earth MOID = 1.40051 au   Jupiter MOID = 2.24279 au   T_jup = 3.393  [ 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 15.27   n/a E2021B10   diameter diameter 2.347 km 0.260 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.321   0.052 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   12955 (2162 T-2)          Discovered 1973-Sep-29 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar Reference: 19991222/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  2162 T-2 = 1998 MX13  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-24 21:42 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin