+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   305608 (2008 YG157) Classification: Main-belt Asteroid          SPK-ID: 2305608 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 8 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08059680627633603 5.8891e-08   a 2.29769507497093 1.3778e-08 au q 2.112508190131406 1.3509e-07 au i 5.097203242906258 7.2109e-06 deg node 127.016605354198 7.1593e-05 deg peri 343.0139212822268 8.5239e-05 deg M 100.6707991258136 4.5433e-05 deg tp 2458644.755632861223 (2019-Jun-10.25563286) 0.00015971 TDB period 1272.146176270107 3.48 1.1442e-05 3.133e-08 d yr n .2829863475717144 2.5453e-09 deg/d Q 2.482881959810453 1.4888e-08 au   Orbit Determination Parameters    # obs. used (total)      115      data-arc span      7707 days (21.10 yr)      first obs. used      1999-03-20      last obs. used      2020-04-25      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .67139      source      ORB      producer      Otto Matic      solution date      2020-May-21 20:00:30   Additional Information  Earth MOID = 1.12969 au   Jupiter MOID = 2.58174 au   T_jup = 3.584  [ hide covariance matrix ] Orbital Elements at Epoch 2457195.5 (2015-Jun-22.0) TDB Reference: JPL 8 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08026049258053926 5.9146e-08   q 2.113337413721231 1.3566e-07 au tp 2457374.175517071340 (2015-Dec-17.67551707) 0.00015755 TDB node 127.0485668792449 7.1564e-05 deg peri 343.5383958550422 8.5242e-05 deg i 5.097969418872282 7.2129e-06 deg   Orbit Determination Parameters    # obs. used (total)      115      data-arc span      7707 days (21.10 yr)      first obs. used      1999-03-20      last obs. used      2020-04-25      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .67139      source      ORB      producer      Otto Matic      solution date      2020-May-21 20:00:30   Additional Information  Jupiter MOID = 2.58174 au   T_jup = 3.584  Orbit Covariance (6×6)   e q tp node peri i e 3.498209307473091E-15 -7.989045375575561E-15 1.871570663211091E-12 -8.70290898577409E-15 5.61472551199297E-13 -3.981681183331219E-16 q -7.989045375575561E-15 1.840496716633473E-14 -3.954411440414385E-12 2.119401616699131E-14 -1.196043940872775E-12 1.291171452420814E-15 tp 1.871570663211091E-12 -3.954411440414385E-12 2.482180581048383E-8 1.66762376244165E-11 7.328381783698209E-9 -3.067143156438142E-15 node -8.70290898577409E-15 2.119401616699131E-14 1.66762376244165E-11 5.121383797119391E-9 -5.095607303587005E-9 8.938565120992803E-11 peri 5.61472551199297E-13 -1.196043940872775E-12 7.328381783698209E-9 -5.095607303587005E-9 7.266225925923185E-9 -8.899683135801061E-11 i -3.981681183331219E-16 1.291171452420814E-15 -3.067143156438142E-15 8.938565120992803E-11 -8.899683135801061E-11 5.202609139299133E-11 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 18.2   n/a MPO460267   305608 (2008 YG157)          Discovered 2008-Dec-29 by Spacewatch at Kitt Peak Reference: 20111110/Numbers.arc Last Updated: 2011-11-14 Alternate Designations  2008 YG157 = 1999 FJ79  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Sep-27 14:22 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin