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951 Gaspra (1916 S45)
Classification: Main-belt Asteroid          SPK-ID: 2000951
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 105 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1732547780961446 3.3928e-08  
a 2.209549077178427 4.6683e-09 au
q 1.826734142119337 7.4645e-08 au
i 4.102689999376484 4.5433e-06 deg
node 253.1611982303615 4.7082e-05 deg
peri 129.4935274876614 4.8498e-05 deg
M 53.26281242907315 1.21e-05 deg
tp 2457223.009342081020
4.0193e-05 JED
period 1199.648196120324
n .3000879767620576 9.5102e-10 deg/d
Q 2.592364012237517 5.477e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1857  
   data-arc span      37254 days (102.00 yr)  
   first obs. used      1913-12-19  
   last obs. used      2015-12-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .56349  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 12:36:16  

Additional Information
 Earth MOID = .831919 au 
 Jupiter MOID = 2.8698 au 
 T_jup = 3.635 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.46 mag n/a PDS3 (MPC 17260)  
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. 2015-December); Warner et al., 2009 Published Reference List:
[Barucci, M.A.; Fulchignoni, M.; Di Martino, M. (1989) Bul. 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.]
B-V BV .870 mag .030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=1; phase=19.53 deg.
U-B UB .554 mag .049 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #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 (1916 S45)          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.DBLast Updated: 2003-08-29

Alternate Designations
 1916 S45 = 1955 MG1 = A913 YA 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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