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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 93 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1735095204048206 4.4309e-08  
a 2.209694199383745 5.2288e-09 AU
q 1.826291218607357 9.6981e-08 AU
i 4.102931576966854 5.2122e-06 deg
node 253.1696180311696 6.0638e-05 deg
peri 129.5114073547521 6.2224e-05 deg
M 233.2157994539028 1.456e-05 deg
tp 2457223.031728243761
(2015-Jul-19.53172824)
4.8807e-05 JED
period 1199.766386604679
3.28
4.2585e-06
1.166e-08
d
yr
n .3000584147208812 1.065e-09 deg/d
Q 2.593097180160133 6.1361e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      1625  
   data-arc span      36596 days (100.19 yr)  
   first obs. used      1913-12-19  
   last obs. used      2014-02-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .58162  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Mar-22 10:35:27  

Additional Information
 Earth MOID = .831729 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 Asteroid Lightcurve DataBase (Rev. 2013-Sep-12) 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, ???-???.]
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 (094)
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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