+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2141 Simferopol (1970 QC1) Classification: Main-belt Asteroid          SPK-ID: 2002141 [ 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 38 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1303153457037017 3.7946e-08   a 2.802800242804314 1.2199e-08 au q 2.437552360224851 1.0869e-07 au i 5.939414530129985 3.2641e-06 deg node 271.6923856564232 4.3319e-05 deg peri 57.31493002975252 4.5808e-05 deg M 242.8038149999992 1.713e-05 deg tp 2459558.453004341470 (2021-Dec-09.95300434) 8.3134e-05 TDB period 1713.904608438643 4.69 1.119e-05 3.064e-08 d yr n .2100466958473015 1.3714e-09 deg/d Q 3.168048125383777 1.3789e-08 au   Orbit Determination Parameters    # obs. used (total)      2552      data-arc span      25141 days (68.83 yr)      first obs. used      1951-10-04      last obs. used      2020-08-03      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42808      source      ORB      producer      Otto Matic      solution date      2020-Aug-24 22:46:21   Additional Information  Earth MOID = 1.43237 au   Jupiter MOID = 2.16263 au   T_jup = 3.304  [ 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 11.6   n/a MPO384768   diameter diameter 12.439 km 0.148 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 14.9508 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Behrend, R. (2012) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Ditteon, R.; Horn, L.; Kamperman, A.; Vorjohan, B.; Kirkpatrick, E. (2012) Minor Planet Bull. 39, 26-28.] [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] geometric albedo albedo 0.314   0.028 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   SMASSII spectral type spec_B Sl   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) 2141 Simferopol (1970 QC1)          Discovered 1970-Aug-30 by Smirnova, T. at Nauchnyj Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1970 QC1 = 1951 SQ = 1951 TO = 1956 UF = 1960 OJ = 1973 FB1 = 1974 ON = 1975 XD1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-24 15:52 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin