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984 Gretia (1922 MH)
Classification: Main-belt Asteroid          SPK-ID: 2000984
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
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 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .197541692437298 5.0859e-08  
a 2.802076652772421 1.2634e-08 AU
q 2.248549688444718 1.4295e-07 AU
i 9.093712427677016 5.9559e-06 deg
node 314.2192752739297 3.3987e-05 deg
peri 55.67554186292623 3.6501e-05 deg
M 215.0521226894833 1.4467e-05 deg
tp 2457690.307327126446
(2016-Oct-28.80732713)
7.1373e-05 JED
period 1713.240941318035
4.69
1.1587e-05
3.172e-08
d
yr
n .2101280627364904 1.4212e-09 deg/d
Q 3.355603617100124 1.513e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1216  
   data-arc span      33535 days (91.81 yr)  
   first obs. used      1922-08-27  
   last obs. used      2014-06-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .56927  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Oct-09 13:48:49  

Additional Information
 Earth MOID = 1.26183 AU 
 T_jup = 3.278 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 9.03 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 12
diameter diameter 31.91 km 3.1 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 12
rotation period rot_per 5.778 h n/a Asteroid Lightcurve DataBase (Rev. 2014-Mar-01) Published Reference List:
[van Houten, C.J. (1962) Bul. Astron. Inst. Netherlands 16, 160-162.]
[Di Martino, M. (1984) Icarus 60, 541-546.]
[Piironen, J.; Bowell, E.; Erikson, A.; Magnusson, P. (1994) Astron. Astrophys. Suppl. Ser. 106, 587-595.]
[Behrend, R. (1997) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Riccioli, D.; Blanco, C.; Cigna, M. (2001) Planetary and Space Sci. 49, 657-671.]
[Behrend, R. (2002) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Marciniak, A.; Michalowski, T.; Kwiatkowski, T.; Kaminski, K.; Hirsch, R. (2008) ACM 2008, 8129.]
[Gandolfi, D.; Cigna, M.; Fulvio, D.; Blanco, C. (2009) Planet. Space Sci. 57, 1-9.]
geometric albedo albedo 0.4239   0.095 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 12
SMASSII spectral type spec_B Sr   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)

984 Gretia (1922 MH)          Discovered 1922-Aug-27 by Reinmuth, K. at Heidelberg (024)
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1922 MH = 1973 LC = A910 BA = A915 DA 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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