+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2001 Einstein (1973 EB) Classification: Inner Main-belt Asteroid          SPK-ID: 2002001 [ 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 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09878627161554165 4.862e-08   a 1.933237724981914 5.4097e-09 au q 1.742260377984439 9.4505e-08 au i 22.68280787165845 5.6419e-06 deg node 357.058523423745 9.1511e-06 deg peri 217.7343183494104 2.7698e-05 deg M 157.2266111755536 2.9331e-05 deg tp 2458571.704842673302 (2019-Mar-29.20484267) 7.9318e-05 TDB period 981.8074401238067 2.69 4.121e-06 1.128e-08 d yr n .3666706782692579 1.5391e-09 deg/d Q 2.124215071979389 5.9441e-09 au   Orbit Determination Parameters    # obs. used (total)      2245      data-arc span      17005 days (46.56 yr)      first obs. used      1973-03-05      last obs. used      2019-09-25      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .34123      source      ORB      producer      Otto Matic      solution date      2020-Feb-22 16:09:54   Additional Information  Earth MOID = .766499 au   Jupiter MOID = 2.8729 au   T_jup = 3.811  [ 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 13.0   n/a MPO492774   diameter diameter 3.975 km 0.154 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 5.487 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Warner, B.D. (2005) Minor Planet Bull. 32, 54-58.] [Warner, B.D. (2008) Minor Planet Bull. 35, 163-167.] [Warner, B.D. (2010) Minor Planet Bull. 37, 57-64.] [Behrend, R. (2012) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Warner, B.D. (2013) Minor Planet Bull. 40, 71-80.] [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] [Behrend, R. (2017) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.810   0.169 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   B-V BV 0.720   0.038 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=24.38, mean=26.43, max.=28.49) deg. U-B UB 0.261   0.023 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=24.38, mean=26.43, max.=28.49) deg. Tholen spectral type spec_T X   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices SMASSII spectral type spec_B Xe   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) 2001 Einstein (1973 EB)          Discovered 1973-Mar-05 by Wild, P. at Zimmerwald Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Aug-08 00:57 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin