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931 Whittemora (A920 FB)
Classification: Main-belt Asteroid          SPK-ID: 2000931
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 50 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2329510018855178 1.6905e-08  
a 3.170393239268215 1.1976e-08 au
q 2.431846957809612 5.2443e-08 au
i 11.48339779047095 8.9327e-07 deg
node 110.9997041104159 3.6098e-06 deg
peri 315.441007654922 7.5421e-06 deg
M 49.73228212001686 4.5325e-06 deg
tp 2459111.658007817907
(2020-Sep-19.15800782)
2.5234e-05 TDB
period 2061.902507069564
5.65
1.1683e-05
3.199e-08
d
yr
n .1745960338889362 9.8929e-10 deg/d
Q 3.908939520726818 1.4766e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2937  
   data-arc span      42785 days (117.14 yr)  
   first obs. used      1904-04-22  
   last obs. used      2021-06-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40172  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 11:44:14  

Additional Information
 Earth MOID = 1.46119 au 
 Jupiter MOID = 1.46909 au 
 T_jup = 3.129 
[ 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 9.29   n/a MPCxxxxx IRAS observations used: 16
diameter diameter 45.298 km 0.727 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 19.199 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Menke, J. (2005) Minor Planet Bull. 32, 85-88.]
[Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.170   0.050 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.700   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=6.33, mean=14.47, max.=22.61) deg.
U-B UB 0.218   0.029 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=6.33, mean=14.47, max.=22.61) deg.
Tholen spectral type spec_T M   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo

931 Whittemora (A920 FB)          Discovered 1920-Mar-19 by Gonnessiat, F. at Algiers
and B. Jekhovsky. Independent discovery Mar. 21 by K. Reinmuth, Heidelberg, was announced first.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A920 FB = A904 HB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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