+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2074 Shoemaker (1974 UA) Classification: Mars-crossing Asteroid          SPK-ID: 2002074 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 32 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08182346847784136 3.8846e-08   a 1.799758455001679 3.7885e-09 au q 1.652495975791121 6.9026e-08 au i 30.07409006287877 4.525e-06 deg node 207.2716937343278 5.5592e-06 deg peri 205.6205226533718 2.0197e-05 deg M 13.26933225823747 1.8251e-05 deg tp 2459167.993790605919 (2020-Nov-14.49379061) 4.4742e-05 TDB period 881.9008488241395 2.41 2.7846e-06 7.624e-09 d yr n .4082091546685742 1.2889e-09 deg/d Q 1.947020934212238 4.0985e-09 au   Orbit Determination Parameters    # obs. used (total)      2429      data-arc span      24392 days (66.78 yr)      first obs. used      1954-04-08      last obs. used      2021-01-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .35345      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 01:00:13   Additional Information  Earth MOID = .667553 au   Jupiter MOID = 3.29213 au   T_jup = 3.906  [ 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 14.0   n/a MPO473792   diameter diameter 3.189 km 0.330 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)   rotation period rot_per 2.5328 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Warner, B.D.; Stephens, R.D.; Harris, A.W.; Pravec, P. (2009) Minor Planet Bull. 36, 176-178.] [Warner, B.D. (2011) Minor Planet Bull. 38, 33-36.] [Klinglesmith III, D.A.; Hendrickx, S.; Madden, K.; Montgomery, S. (2016) Minor Planet Bull. 43, 123-128.] [Warner, B.D. (2018) Minor Planet Bull. 45, 39-45.] geometric albedo albedo 0.491   0.191 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)   SMASSII spectral type spec_B Sa   n/a Xu et al. (1995) Icarus 115, 1-35   2074 Shoemaker (1974 UA)          Discovered 1974-Oct-17 by Helin, E. F. at Palomar Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Feb-25 17:12 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin