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638 Moira (A917 RC)
Classification: Main-belt Asteroid          SPK-ID: 2000638
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 82 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1591645167976574 3.3409e-08  
a 2.7348881284966 5.4435e-09 au
q 2.299590981028789 9.1815e-08 au
i 7.713452584451832 3.0819e-06 deg
node 103.1897967851681 2.5636e-05 deg
peri 128.9523577743253 2.7299e-05 deg
M 359.3942741546165 9.4482e-06 deg
tp 2459003.279594092156
(2020-Jun-02.77959409)
4.3361e-05 TDB
period 1651.991376631123
4.52
4.9322e-06
1.35e-08
d
yr
n .2179188130716164 6.5062e-10 deg/d
Q 3.170185275964411 6.3099e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3242  
   data-arc span      41782 days (114.39 yr)  
   first obs. used      1906-01-24  
   last obs. used      2020-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43679  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:17:50  

Additional Information
 Earth MOID = 1.29752 au 
 Jupiter MOID = 1.86345 au 
 T_jup = 3.321 
[ 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 10.0   n/a MPO279519  
diameter diameter 59.594 km 0.387 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 9.875 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.060   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
SMASSII spectral type spec_B Ch   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)

638 Moira (A917 RC)          Discovered 1907-May-05 by Metcalf, J. H. at Taunton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A917 RC = 1944 QJ = 1976 WA1 = A893 EB = A906 BF = A907 JG 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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