+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   3287 Olmstead (1981 DK1) Classification: Mars-crossing Asteroid          SPK-ID: 2003287 [ 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 26 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3003924464320481 3.8856e-08   a 2.366047591607959 6.7068e-09 au q 1.655304767190188 9.1862e-08 au i 12.07668218437002 4.296e-06 deg node 213.2551595584265 2.091e-05 deg peri 95.71720000808531 2.1975e-05 deg M 181.3305105297869 6.0557e-06 deg tp 2459660.253247286765 (2022-Mar-21.75324729) 2.2999e-05 TDB period 1329.332555477145 3.64 5.6522e-06 1.547e-08 d yr n .2708125957772718 1.1515e-09 deg/d Q 3.076790416025729 8.7214e-09 au   Orbit Determination Parameters    # obs. used (total)      1535      data-arc span      14232 days (38.97 yr)      first obs. used      1981-02-09      last obs. used      2020-01-28      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .47241      source      ORB      producer      Otto Matic      solution date      2020-Feb-22 16:43:17   Additional Information  Earth MOID = .695803 au   Jupiter MOID = 2.36313 au   T_jup = 3.457  [ 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 14.2   n/a MPO452209   diameter diameter 5.515 km 1.478 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)   rotation period rot_per 4.963 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Wisniewski, W.Z.; Michalowski, T.M.; Harris, A.W.; McMillan, R.S. (1997) Icarus 126, 395-449; 1995, Lunar & Planetary Sci. XXVI, 1511-1512.] [Warner, B.D. (2018) Minor Planet Bull. 45, 380-386.] [Benishek, V. (2019) Minor Planet Bull. 46, 87-90.] geometric albedo albedo 0.132   0.065 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)   SMASSII spectral type spec_B L   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 3287 Olmstead (1981 DK1)          Discovered 1981-Feb-28 by Bus, S. J. at Siding Spring Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Sep-19 22:58 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin