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

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

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Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


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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