+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   120940 (1998 TN12) Classification: Main-belt Asteroid          SPK-ID: 2120940 [ 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 .111483860169211 4.4274e-08   a 3.055795329760318 2.0215e-08 au q 2.715123470511591 1.338e-07 au i .4641229853787331 4.3738e-06 deg node 265.8471397136248 0.00064413 deg peri 60.12896180349326 0.00064453 deg M 115.330894871869 2.1885e-05 deg tp 2458575.430969304367 (2019-Apr-01.93096930) 0.00011855 TDB period 1951.123775640755 5.34 1.9361e-05 5.301e-08 d yr n .1845090529337509 1.8309e-09 deg/d Q 3.396467189009045 2.2469e-08 au   Orbit Determination Parameters    # obs. used (total)      527      data-arc span      8133 days (22.27 yr)      first obs. used      1998-10-13      last obs. used      2021-01-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .54481      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 09:26:15   Additional Information  Earth MOID = 1.70137 au   Jupiter MOID = 1.90703 au   T_jup = 3.226  [ 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 MPO453680   diameter diameter 4.254 km 0.749 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.051   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   120940 (1998 TN12)          Discovered 1998-Oct-13 by Spacewatch at Kitt Peak Reference: 20060314/Numbers.arc Last Updated: 2006-03-23 [ show close-approach data ] Alternate Designations  1998 TN12 = 2000 AD253 = 2001 FE182  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-03 19:44 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin