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JPL Small-Body Database Browser
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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2325829893211425 4.0923e-08  
a 3.169007026344461 1.6005e-08 au
q 2.431949898977562 1.3443e-07 au
i 11.48398576918935 4.7082e-06 deg
node 110.9995928171028 2.4429e-05 deg
peri 315.4539573098952 2.6408e-05 deg
M 340.5744579034241 1.196e-05 deg
tp 2459111.686965196714
(2020-Sep-19.18696520)
6.8833e-05 TDB
period 2060.550345098095
5.64
1.561e-05
4.274e-08
d
yr
n .1747106062496433 1.3235e-09 deg/d
Q 3.906064153711361 1.9727e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2410  
   data-arc span      42264 days (115.71 yr)  
   first obs. used      1904-04-22  
   last obs. used      2020-01-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43097  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 17:44:54  

Additional Information
 Earth MOID = 1.4615 au 
 Jupiter MOID = 1.4703 au 
 T_jup = 3.130 
[ 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 9.3   n/a MPO502162 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. 2019-August); 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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