+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   951 Gaspra (A916 OJ) Classification: Main-belt Asteroid          SPK-ID: 2000951 [ 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 125 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .173849911188396 3.359e-08   a 2.20923778006675 3.5043e-09 au q 1.825161988208096 7.4029e-08 au i 4.10698977232797 3.3764e-06 deg node 253.0523345296097 4.3945e-05 deg peri 129.9205875351853 4.4647e-05 deg M 172.9363570678087 8.2628e-06 deg tp 2458424.336258118962 (2018-Nov-01.83625812) 2.7417e-05 TDB period 1199.394682494926 3.28 2.8537e-06 7.813e-09 d yr n .3001514057500608 7.1415e-10 deg/d Q 2.593313571925403 4.1135e-09 au   Orbit Determination Parameters    # obs. used (total)      3475      data-arc span      38944 days (106.62 yr)      first obs. used      1913-12-19      last obs. used      2020-08-03      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .43727      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:24:02   Additional Information  Earth MOID = .832024 au   Jupiter MOID = 2.86908 au   T_jup = 3.635  [ 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 11.51   n/a E2021B10   diameter diameter 12.2 km n/a n/a Yeomans E-mail 2001-Apr-04 extent extent 18.2x10.5x8.9 km n/a Thomas, P.C. et al. (1994) Icarus v.107, pp.23-36   rotation period rot_per 7.042 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Barucci, M.A.; Fulchignoni, M.; Di Martino, M. (1989) Bull. Amer. Astron. Soc. 21, 963.] [Di Martino, M.; Ferreri, W.; Fulchignoni, M.; De Angelis, G.; et al. (1990) Icarus 87, 372-376.] [Goldader, J.D.; Tholen, D.J.; Cruikshank, D.P.; Hartmann, W.K. (1991) Astron. J. 102, 1503-1509.] [De Angelis, G. (1992) in Physical properties of small solar system bodies. A. Brahic, J.-C. Gerard, J. Surdej, eds. Universite de Liege, Institut d'Astrophysique, Liege, pp. 195-201.] [Magnusson, P.; Barucci, M.A.; Binzel, R.P.; Blanco, C.; et al. (1992) Icarus 97, 124-129.] [Wisniewski, W.Z.; Barucci, M.A.; Fulchignoni, M.; De Sanctis, C.; et al. (1993) Icarus 101, 213-222.] [De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.] [Kaasalainen, M.; Torppa, J.; Muinonen, K. (2001) Icarus 153, 37-51.] [Tungalag, N.; Shevchenko, V.G.; Lupishko, D.F. (2002) Kin. Fiz. Neb. Tel 18, 508-516; Kinematics and Physics of Celestial Bodies 18, ???-???.] [Hanus, J.; Broz, M.; Durech, J.; Warner, B.D.; et al. (2013) Astron. Astrophys. 559, A134.] [Dykhuis, M.J.; Molnar, L.A.; Gates, C.J.; Gonzales, J.A.; et al. (2016) Icarus 267, 174-203.] [Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.246   0.032 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.870   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=19.53 deg. U-B UB 0.554   0.049 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=19.53 deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices SMASSII spectral type spec_B S   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) 951 Gaspra (A916 OJ)          Discovered 1916-Jul-30 by Neujmin, G. at Simeis Discovered at Simeis during the First World War while Simeis was not in communication with the Rechen-Institut for long periods of time were given provisional designations containing the Greek letter SIGMA. These are here abbreviated S. Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A916 OJ = 1955 MG1 = A913 YA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Feb-25 08:41 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin