+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   249213 (2008 DS87) Classification: Main-belt Asteroid          SPK-ID: 2249213 [ 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 15 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .06071389532365812 6.212e-08   a 2.755673822308142 1.9032e-08 au q 2.588366130314381 1.696e-07 au i 4.027958723855773 4.4782e-06 deg node 281.8051112640236 9.1998e-05 deg peri 78.98140083929121 0.00010146 deg M 65.4226766456177 4.0015e-05 deg tp 2458696.855128374242 (2019-Aug-01.35512837) 0.00018583 TDB period 1670.860310063376 4.57 1.731e-05 4.739e-08 d yr n .2154578679209546 2.2321e-09 deg/d Q 2.922981514301904 2.0188e-08 au   Orbit Determination Parameters    # obs. used (total)      263      data-arc span      8353 days (22.87 yr)      first obs. used      1998-01-01      last obs. used      2020-11-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .56157      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 00:12:12   Additional Information  Earth MOID = 1.58845 au   Jupiter MOID = 2.37458 au   T_jup = 3.337  [ 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 16.3   n/a MPO494359   diameter diameter 3.248 km 0.663 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.046   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   249213 (2008 DS87)          Discovered 2008-Feb-29 by Spacewatch at Kitt Peak Reference: 20100824/Numbers.arc Last Updated: 2010-08-27 [ hide close-approach data ] Close-Approach Data   ...sorted by Date/Time (TDB) Date/Time (TDB) Time Uncertainty (days_HH:MM) Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified 2026-Nov-16 13:53 00:07 Iris 0.0177188528385972 0.0177170434521814 0.0177206626274037 2.41646963941984 2.41646950515692 2461361.078415174 6.81078592974529 272.864339045792 77.1642473716365 -79.7527299677685 33796.5664414055 T 15 CATAB v2.0f-lin.ifort 2020-Dec-18 00:12:13 2020-Dec-18 00:12 Alternate Designations  2008 DS87 = 1998 AE1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-20 23:48 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin