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839 Valborg (A916 SM)
Classification: Main-belt Asteroid          SPK-ID: 2000839
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1523052439696061 4.1326e-08  
a 2.614491652220819 9.556e-09 au
q 2.216290863272829 1.0955e-07 au
i 12.6057481186692 4.7308e-06 deg
node 338.1788022476131 1.5234e-05 deg
peri 339.8331984492778 1.9199e-05 deg
M 229.0306000997846 1.3356e-05 deg
tp 2459562.254620152537
(2021-Dec-13.75462015)
5.8317e-05 TDB
period 1544.113841927902
4.23
8.4657e-06
2.318e-08
d
yr
n .2331434316724486 1.2782e-09 deg/d
Q 3.012692441168809 1.1011e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2785  
   data-arc span      36430 days (99.74 yr)  
   first obs. used      1920-09-19  
   last obs. used      2020-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38672  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:21:21  

Additional Information
 Earth MOID = 1.20807 au 
 Jupiter MOID = 2.33488 au 
 T_jup = 3.358 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.6   n/a MPO296131  
diameter diameter 20.39 km 0.8 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 11
rotation period rot_per 10.366 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Warner, B.D. (2006) Minor Planet Bull. 33, 39-41.]
[Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.3534   0.028 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 11
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a medium resolution spectrum published by Chapman and Gaffey (1979)

839 Valborg (A916 SM)          Discovered 1916-Sep-24 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A916 SM = 1948 CF = 1952 BW1 = 1954 UH1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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