+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 16 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1114780519333483 4.4622e-08   a 3.055017062628307 2.0568e-08 au q 2.714449711863364 1.3532e-07 au i .4642335035619122 4.4478e-06 deg node 265.842915856402 0.00065954 deg peri 60.00158986386763 0.00065996 deg M 78.56180467568466 2.2291e-05 deg tp 2458574.874305786091 (2019-Apr-01.37430579) 0.00012078 TDB period 1950.378438346026 5.34 1.9696e-05 5.392e-08 d yr n .1845795630848389 1.864e-09 deg/d Q 3.395584413393251 2.286e-08 au   Orbit Determination Parameters    # obs. used (total)      499      data-arc span      7689 days (21.05 yr)      first obs. used      1998-10-13      last obs. used      2019-11-01      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55302      source      ORB      producer      Otto Matic      solution date      2019-Dec-04 11:16:43   Additional Information  Earth MOID = 1.70262 au   Jupiter MOID = 1.9077 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 ] 2020-Oct-25 09:27 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin