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JPL Small-Body Database Browser
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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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1256815749452698 4.1055e-08  
a 3.191225361399025 1.6983e-08 au
q 2.790147131973108 1.3365e-07 au
i 8.155126408202459 5.424e-06 deg
node 5.329781032533188 2.8869e-05 deg
peri 120.1545565141648 3.5056e-05 deg
M 187.1345869866196 1.9667e-05 deg
tp 2460000.362421647750
(2023-Feb-24.86242165)
0.00011413 TDB
period 2082.258477960124
5.70
1.6622e-05
4.551e-08
d
yr
n .1728891988244766 1.3801e-09 deg/d
Q 3.592303590824942 1.9117e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3255  
   data-arc span      41138 days (112.63 yr)  
   first obs. used      1907-09-11  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .37165  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:09:36  

Additional Information
 Earth MOID = 1.81634 au 
 Jupiter MOID = 1.49202 au 
 T_jup = 3.169 
[ 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 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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