+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2771 Polzunov (1978 SP7) Classification: Main-belt Asteroid          SPK-ID: 2002771 [ 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 35 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .227485546068921 3.9473e-08   a 2.67740207342467 1.164e-08 au q 2.068331800705598 1.0425e-07 au i 13.9582294963744 4.5887e-06 deg node 207.3664807817118 1.71e-05 deg peri 116.6647770745186 1.9486e-05 deg M 214.8447157864248 1.1884e-05 deg tp 2459645.707147254830 (2022-Mar-07.20714725) 5.5443e-05 TDB period 1600.179933304944 4.38 1.0435e-05 2.857e-08 d yr n .2249746997242187 1.4671e-09 deg/d Q 3.286472346143742 1.4288e-08 au   Orbit Determination Parameters    # obs. used (total)      2215      data-arc span      28008 days (76.68 yr)      first obs. used      1943-10-05      last obs. used      2020-06-10      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .41426      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 15:49:50   Additional Information  Earth MOID = 1.10025 au   Jupiter MOID = 2.2976 au   T_jup = 3.299  [ 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 12.5   n/a MPO452201   diameter diameter 11.332 km 0.189 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 11.66 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Stephens, R.D. (2005) Minor Planet Bull. 32, 2-3.] [Chiorny, V.G.; Shevchenko, V.G.; Krugly, Yu.N.; Velichko, F.P.; Gaftonyuk, N.M. (2007) Planet. Space Sci. 55, 986-997.] geometric albedo albedo 0.218   0.040 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   2771 Polzunov (1978 SP7)          Discovered 1978-Sep-26 by Zhuravleva, L. at Nauchnyj Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1978 SP7 = 1943 TG = 1981 EK6 = 1982 NB  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-25 21:22 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin