+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   173358 (1999 YL12) Classification: Main-belt Asteroid          SPK-ID: 2173358 [ 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 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .04500839669426328 6.0644e-08   a 2.58627552518149 2.0668e-08 au q 2.469871410383457 1.4904e-07 au i 27.68163577029925 4.8996e-06 deg node 264.5330500412228 1.3774e-05 deg peri 1.34631549055843 7.7937e-05 deg M 146.9043051846085 7.8426e-05 deg tp 2458380.570027146566 (2018-Sep-19.07002715) 0.00032953 TDB period 1519.184818625853 4.16 1.8211e-05 4.986e-08 d yr n .2369691926790254 2.8406e-09 deg/d Q 2.702679639979523 2.1599e-08 au   Orbit Determination Parameters    # obs. used (total)      543      data-arc span      7673 days (21.01 yr)      first obs. used      1999-11-14      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .46793      source      ORB      producer      Otto Matic      solution date      2020-Dec-17 23:25:59   Additional Information  Earth MOID = 1.45412 au   Jupiter MOID = 2.40046 au   T_jup = 3.259  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.1   n/a MPO502965   diameter diameter 5.785 km 0.173 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.063   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   173358 (1999 YL12)          Discovered 1999-Dec-27 by Spacewatch at Kitt Peak Reference: 20080122/Numbers.arc Last Updated: 2008-01-28 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-23 06:06 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin