+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   70498 (1999 TN91) Classification: Main-belt Asteroid          SPK-ID: 2070498 [ 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 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1049121429922828 3.2988e-08   a 2.363936853887916 9.1328e-09 au q 2.1159311726481 7.7625e-08 au i 5.881741650853593 4.3629e-06 deg node 152.985037678036 3.6329e-05 deg peri 303.6247560856643 4.2515e-05 deg M 172.4016108630215 2.2048e-05 deg tp 2458364.743143604090 (2018-Sep-03.24314360) 8.0213e-05 TDB period 1327.554117138581 3.63 7.6933e-06 2.106e-08 d yr n .2711753858862992 1.5715e-09 deg/d Q 2.611942535127732 1.0091e-08 au   Orbit Determination Parameters    # obs. used (total)      875      data-arc span      8700 days (23.82 yr)      first obs. used      1995-07-03      last obs. used      2019-04-28      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .58063      source      ORB      producer      Otto Matic      solution date      2019-Jul-13 06:41:17   Additional Information  Earth MOID = 1.13927 au   Jupiter MOID = 2.51667 au   T_jup = 3.535  [ 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 15.7   n/a MPO474583   diameter diameter 2.072 km 0.623 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.180   0.052 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   70498 (1999 TN91)          Discovered 1999-Oct-02 by LINEAR at Socorro Reference: 20031109/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1999 TN91 = 1999 TD323  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Sep-27 08:00 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin