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984 Gretia (A922 QD)
Classification: Main-belt Asteroid          SPK-ID: 2000984
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1967321571791892 4.5236e-08  
a 2.804879009972241 1.0164e-08 au
q 2.253069111713774 1.2872e-07 au
i 9.094743900227261 4.8185e-06 deg
node 314.1745948947742 2.7716e-05 deg
peri 55.14677295692266 2.9601e-05 deg
M 275.7587384612059 1.2498e-05 deg
tp 2459402.005951063430
(2021-Jul-06.50595106)
6.0725e-05 TDB
period 1715.811702514349
4.70
9.3267e-06
2.554e-08
d
yr
n .2098132326947394 1.1405e-09 deg/d
Q 3.356688908230708 1.2164e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2611  
   data-arc span      35724 days (97.81 yr)  
   first obs. used      1922-08-27  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42111  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:24:28  

Additional Information
 Earth MOID = 1.26592 au 
 Jupiter MOID = 2.18267 au 
 T_jup = 3.277 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 9.5   n/a MPO473776 IRAS observations used: 12
diameter diameter 32.449 km 0.306 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 5.778 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 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) Planet. 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.]
[Schmidt, R.E. (2017) Minor Planet Bull. 44, 191-192.]
geometric albedo albedo 0.421   0.038 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
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 (A922 QD)          Discovered 1922-Aug-27 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A922 QD = 1973 LC = A910 BA = A915 DA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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