+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3004729277158089 3.831e-08   a 2.365806875838251 6.5633e-09 au q 1.65494595744494 9.0703e-08 au i 12.0775370233373 4.1361e-06 deg node 213.2440872263179 2.0429e-05 deg peri 95.75222846348606 2.1345e-05 deg M 235.4594329526867 6.0096e-06 deg tp 2459660.307127892956 (2022-Mar-21.80712789) 2.2736e-05 TDB period 1329.129696178262 3.64 5.531e-06 1.514e-08 d yr n .270853928728801 1.1271e-09 deg/d Q 3.076667794231561 8.5354e-09 au   Orbit Determination Parameters    # obs. used (total)      1587      data-arc span      14588 days (39.94 yr)      first obs. used      1981-02-09      last obs. used      2021-01-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .46929      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 01:09:22   Additional Information  Earth MOID = .693741 au   Jupiter MOID = 2.3631 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 14.25   n/a E2021B10   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. 2020-October); 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 ] 2021-Mar-03 00:23 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin