+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   70423 (1999 SB18) Classification: Main-belt Asteroid          SPK-ID: 2070423 [ 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 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1353931242394311 2.9492e-08   a 2.360694319400072 8.2539e-09 au q 2.041072540122219 7.1731e-08 au i 7.466083043611143 3.6883e-06 deg node 91.3618070632494 2.6142e-05 deg peri 229.5571984986329 3.013e-05 deg M 278.929218992304 1.6743e-05 deg tp 2459298.845791109657 (2021-Mar-25.34579111) 6.2344e-05 TDB period 1324.823610485273 3.63 6.9481e-06 1.902e-08 d yr n .2717342876068873 1.4251e-09 deg/d Q 2.680316098677925 9.3714e-09 au   Orbit Determination Parameters    # obs. used (total)      1272      data-arc span      7638 days (20.91 yr)      first obs. used      1999-09-13      last obs. used      2020-08-11      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50889      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 22:00:44   Additional Information  Earth MOID = 1.03678 au   Jupiter MOID = 2.59723 au   T_jup = 3.528  [ 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 15.2   n/a MPO319891   diameter diameter 2.391 km 0.379 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.309   0.140 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   70423 (1999 SB18)          Discovered 1999-Sep-30 by LINEAR at Socorro Reference: 20031109/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1999 SB18 = 2001 BM8  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-27 21:07 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin