+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   9533 Aleksejleonov (1981 SA7) Classification: Main-belt Asteroid          SPK-ID: 2009533 [ 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 28 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1753519903650467 4.2055e-08   a 2.617769368694062 9.4886e-09 au q 2.158738299576906 1.1203e-07 au i 6.60847135576685 4.6701e-06 deg node 54.62926278140826 3.6346e-05 deg peri 355.0504778133449 3.8598e-05 deg M 20.76769334718212 1.1763e-05 deg tp 2458911.255541055403 (2020-Mar-02.75554106) 5.0498e-05 TDB period 1547.018471573024 4.24 8.4112e-06 2.303e-08 d yr n .2327056894375335 1.2652e-09 deg/d Q 3.076800437811217 1.1152e-08 au   Orbit Determination Parameters    # obs. used (total)      2076      data-arc span      17133 days (46.91 yr)      first obs. used      1973-12-20      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .49197      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:38:53   Additional Information  Earth MOID = 1.16932 au   Jupiter MOID = 2.30337 au   T_jup = 3.375  [ 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 13.5   n/a MPO358723   diameter diameter 9.552 km 0.201 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.064   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   9533 Aleksejleonov           Discovered 1981 Sept. 28 by L. V. Zhuravleva at the Crimean Astrophysical Observatory. Aleksej Arkhipovich Leonov (b. 1934), during a spaceflight in 1965 with P. I. Belyaev on Voskhod 2, became the first human to "spacewalk" outside a spacecraft when he left the spacecraft for approximately 10 minutes. He was also the commander of the Soyuz spacecraft that linked with the Apollo spacecraft in 1975. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20010705/MPCPages.arc Last Updated: 2009-05-11 Alternate Designations  1981 SA7 = 1973 YK2 = 1985 PJ2  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-21 06:12 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin