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731 Sorga (A912 GH)
Classification: Main-belt Asteroid          SPK-ID: 2000731
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 56 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1413885319387446 1.9885e-08  
a 2.986637212682556 1.1869e-08 au
q 2.564360961747746 6.4227e-08 au
i 10.6898719594386 7.3271e-07 deg
node 46.13078129378315 5.4356e-06 deg
peri 288.6775802447825 8.1548e-06 deg
M 239.1640820891403 9.2769e-06 deg
tp 2459833.298847551766
(2022-Sep-10.79884755)
5.0309e-05 TDB
period 1885.263827653372
5.16
1.1238e-05
3.077e-08
d
yr
n .1909547060307732 1.1383e-09 deg/d
Q 3.408913463617367 1.3547e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3239  
   data-arc span      38405 days (105.15 yr)  
   first obs. used      1916-01-30  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41317  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 18:48:35  

Additional Information
 Earth MOID = 1.57868 au 
 Jupiter MOID = 2.08219 au 
 T_jup = 3.216 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456566.5 (2013-Oct-01.0) TDB
Reference: JPL 56 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1366228680674912 1.9699e-08  
q 2.58454755199153 6.3049e-08 au
tp 2456052.852773734861
(2012-May-05.35277373)
4.5443e-05 TDB
node 46.5120386016869 5.4255e-06 deg
peri 287.5980006847432 8.3294e-06 deg
i 10.69532802384025 7.2852e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3239  
   data-arc span      38405 days (105.15 yr)  
   first obs. used      1916-01-30  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41317  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 18:48:35  

Additional Information
 Jupiter MOID = 2.08219 au 
 T_jup = 3.216 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.88053235476118E-16 -1.227790980515557E-15 -3.807054931367334E-13 4.613934216281019E-15 -5.322286337833921E-14 2.491884024475974E-15
q -1.227790980515557E-15 3.975143539084801E-15 1.137151296239542E-12 -1.215574875902989E-14 1.644754509562026E-13 -7.827018381744612E-15
tp -3.807054931367334E-13 1.137151296239542E-12 2.065037294713132E-9 2.472179231984545E-11 2.886776920383692E-10 6.569214597436321E-12
node 4.613934216281019E-15 -1.215574875902989E-14 2.472179231984545E-11 2.943638768019367E-11 -2.471480282505497E-11 -2.508149493248539E-12
peri -5.322286337833921E-14 1.644754509562026E-13 2.886776920383692E-10 -2.471480282505497E-11 6.937900644895343E-11 3.930863551953E-12
i 2.491884024475974E-15 -7.827018381744612E-15 6.569214597436321E-12 -2.508149493248539E-12 3.930863551953E-12 5.307343962951452E-13

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 9.72   n/a MPCxxxxx IRAS observations used: 10
diameter diameter 34.597 km 0.409 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 8.184 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Warner, B.D. (2005) Minor Planet Bull. 32, 90-92.]
[Warner, B.D. (2009) Minor Planet Bull. 36, 109-116.]
[Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Behrend, R. (2017) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.209   0.042 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.691   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=1.96, mean=6.80, max.=11.63) deg.
U-B UB 0.312   0.028 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=1.96, mean=6.80, max.=11.63) deg.
Tholen spectral type spec_T CD   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
SMASSII spectral type spec_B Xe   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)

731 Sorga (A912 GH)          Discovered 1912-Apr-15 by Massinger, A. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A912 GH = 1940 WP 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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