+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 9 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08033950043809814 5.1529e-08   a 2.29828595162672 1.331e-08 au q 2.113642806409131 1.163e-07 au i 5.097379834361824 5.9307e-06 deg node 127.01402673202 7.1348e-05 deg peri 343.120942370125 8.428e-05 deg M 157.1619232172652 4.4853e-05 deg tp 2458644.916480700807 (2019-Jun-10.41648070) 0.00015689 TDB period 1272.636926637821 3.48 1.1055e-05 3.027e-08 d yr n .2828772232400045 2.4573e-09 deg/d Q 2.48292909684431 1.4379e-08 au   Orbit Determination Parameters    # obs. used (total)      129      data-arc span      7729 days (21.16 yr)      first obs. used      1999-03-20      last obs. used      2020-05-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .65416      source      ORB      producer      Otto Matic      solution date      2020-Nov-11 19:11:22   Additional Information  Earth MOID = 1.1307 au   Jupiter MOID = 2.58057 au   T_jup = 3.584  [ hide covariance matrix ] Orbital Elements at Epoch 2457530.5 (2016-May-22.0) TDB Reference: JPL 9 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .0805885610152559 5.1647e-08   q 2.113265454313601 1.1666e-07 au tp 2457374.358509660418 (2015-Dec-17.85850966) 0.00015297 TDB node 127.0471829855861 7.1341e-05 deg peri 343.5981628448574 8.4136e-05 deg i 5.097441559705884 5.9314e-06 deg   Orbit Determination Parameters    # obs. used (total)      129      data-arc span      7729 days (21.16 yr)      first obs. used      1999-03-20      last obs. used      2020-05-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .65416      source      ORB      producer      Otto Matic      solution date      2020-Nov-11 19:11:22   Additional Information  Jupiter MOID = 2.58057 au   T_jup = 3.584  Orbit Covariance (6×6)   e q tp node peri i e 2.667411236987342E-15 -5.993686497804178E-15 8.471330114391087E-13 -7.876188555304056E-15 2.081122251274898E-13 -6.82190341634948E-16 q -5.993686497804178E-15 1.361052345846175E-14 -1.507549955827975E-12 1.9603802757878E-14 -3.509889318584141E-13 1.742158860861132E-15 tp 8.471330114391087E-13 -1.507549955827975E-12 2.339920355055776E-8 2.030792094532256E-12 6.859631079525316E-9 -1.112180760341604E-11 node -7.876188555304056E-15 1.9603802757878E-14 2.030792094532256E-12 5.08960886221362E-9 -5.068320761748698E-9 6.593746969651633E-11 peri 2.081122251274898E-13 -3.509889318584141E-13 6.859631079525316E-9 -5.068320761748698E-9 7.078914628126514E-9 -6.897707170494768E-11 i -6.82190341634948E-16 1.742158860861132E-15 -1.112180760341604E-11 6.593746969651633E-11 -6.897707170494768E-11 3.518092054644623E-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 18.16   n/a E2021B25   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 ] 2021-Apr-11 16:09 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin