+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 40 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2276419253506816 1.1623e-08   a 2.676899742957497 1.0635e-08 au q 2.067525131499908 3.3605e-08 au i 13.9601901179584 2.9725e-07 deg node 207.3623185310637 3.4748e-06 deg peri 116.7068170539922 5.8666e-06 deg M 259.8083770876498 9.0689e-06 deg tp 2459645.720852111533 (2022-Mar-07.22085211) 4.2083e-05 TDB period 1599.729619115642 4.38 9.533e-06 2.61e-08 d yr n .2250380287382653 1.341e-09 deg/d Q 3.286274354415087 1.3055e-08 au   Orbit Determination Parameters    # obs. used (total)      2387      data-arc span      28293 days (77.46 yr)      first obs. used      1943-10-05      last obs. used      2021-03-22      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .41295      source      ORB      producer      Otto Matic      solution date      2021-May-03 20:30:29   Additional Information  Earth MOID = 1.09769 au   Jupiter MOID = 2.29808 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 12.54   n/a MPCxxxxx   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-May-14 01:26 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin