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642 Clara (A907 RJ)
Classification: Main-belt Asteroid          SPK-ID: 2000642
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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1256815754255753 4.1018e-08  
a 3.191225361134086 1.5671e-08 au
q 2.790147130208704 1.332e-07 au
i 8.15512489608553 5.0318e-06 deg
node 5.329776102363506 2.8054e-05 deg
peri 120.1545615115164 3.3209e-05 deg
M 187.134586841244 1.8682e-05 deg
tp 2460000.362422364094
(2023-Feb-24.86242236)
0.00010941 TDB
period 2082.258477700817
5.70
1.5338e-05
4.199e-08
d
yr
n .1728891988460068 1.2735e-09 deg/d
Q 3.592303592059468 1.764e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3428  
   data-arc span      41232 days (112.89 yr)  
   first obs. used      1907-09-11  
   last obs. used      2020-07-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .3636  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:19:35  

Additional Information
 Earth MOID = 1.81634 au 
 Jupiter MOID = 1.49202 au 
 T_jup = 3.169 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456229.5 (2012-Oct-29.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .121691595687708 3.9811e-08  
q 2.803456914671993 1.2753e-07 au
tp 2455819.808868756588
(2011-Sep-15.30886876)
0.0001119 TDB
node 5.941791628892231 2.7968e-05 deg
peri 117.5637019455783 3.3918e-05 deg
i 8.170103675168811 5.0331e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3428  
   data-arc span      41232 days (112.89 yr)  
   first obs. used      1907-09-11  
   last obs. used      2020-07-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .3636  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:19:35  

Additional Information
 Jupiter MOID = 1.49202 au 
 T_jup = 3.169 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.584911108317893E-15 -5.05152082970404E-15 1.36089300812271E-12 1.842211934163083E-15 2.465909428128621E-13 -1.153515522266837E-16
q -5.05152082970404E-15 1.62638563536528E-14 -4.243109837662575E-12 -1.525092915539788E-16 -7.7421906823244E-13 1.729911499513615E-15
tp 1.36089300812271E-12 -4.243109837662575E-12 1.252092505766743E-8 -6.120282356530725E-12 2.173126965918429E-9 -7.197550975850829E-12
node 1.842211934163083E-15 -1.525092915539788E-16 -6.120282356530725E-12 7.822142926876854E-10 -7.737960094924649E-10 -1.953010120657222E-11
peri 2.465909428128621E-13 -7.7421906823244E-13 2.173126965918429E-9 -7.737960094924649E-10 1.150432055977701E-9 1.833670171082671E-11
i -1.153515522266837E-16 1.729911499513615E-15 -7.197550975850829E-12 -1.953010120657222E-11 1.833670171082671E-11 2.533218621752252E-11

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 MPO492757 IRAS observations used: 14
diameter diameter 33.36 km 1.5 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 14
rotation period rot_per 8.2308 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[LeCrone, C.; Mills, G.; Ditteon, R. (2005) Minor Planet Bull. 32, 62-64.]
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.1617   0.015 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 14
B-V BV 0.897   0.106 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=4.37, mean=4.43, max.=4.49) deg.
U-B UB 0.417   0.040 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=4.37, mean=4.43, max.=4.49) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
SMASSII spectral type spec_B L   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)

642 Clara (A907 RJ)          Discovered 1907-Sep-08 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A907 RJ = 1949 BS 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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