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577 Rhea (A905 UR)
Classification: Main-belt Asteroid          SPK-ID: 2000577
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1558316046455158 3.671e-08  
a 3.113882691146127 1.4142e-08 au
q 2.628641354706929 1.1749e-07 au
i 5.299284573733122 4.1514e-06 deg
node 328.4906434859878 4.3557e-05 deg
peri 330.1696619113196 4.5502e-05 deg
M 357.3815421536921 1.4538e-05 deg
tp 2459015.098051248632
(2020-Jun-14.59805125)
8.1081e-05 TDB
period 2007.020451720349
5.49
1.3672e-05
3.743e-08
d
yr
n .1793703694904655 1.2219e-09 deg/d
Q 3.599124027585324 1.6345e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2958  
   data-arc span      41879 days (114.66 yr)  
   first obs. used      1905-10-20  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4479  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:16:41  

Additional Information
 Earth MOID = 1.61469 au 
 Jupiter MOID = 1.64462 au 
 T_jup = 3.193 
[ 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 9.4   n/a MPO350801  
diameter diameter 38.234 km 1.701 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 12.249 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Alkema, M.S. (2013) Minor Planet Bull. 40, 133-137.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.230   0.036 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

577 Rhea (A905 UR)          Discovered 1905-Oct-20 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A905 UR = 1943 QD = 1949 SF1 = 1952 DC = A912 AC 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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