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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 ]

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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1519585079132178 4.1714e-08  
a 2.615273617249149 1.0388e-08 au
q 2.217860540587165 1.1019e-07 au
i 12.60265056559312 4.7679e-06 deg
node 338.1840690146893 1.7849e-05 deg
peri 339.7848973106555 2.2051e-05 deg
M 135.850311083477 1.371e-05 deg
tp 2458017.548717117600
(2017-Sep-21.04871712)
5.8444e-05 TDB
period 1544.806634330841
4.23
9.2043e-06
2.52e-08
d
yr
n .233038874898372 1.3885e-09 deg/d
Q 3.012686693911134 1.1967e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2205  
   data-arc span      36201 days (99.11 yr)  
   first obs. used      1920-09-19  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42239  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 01:58:10  

Additional Information
 Earth MOID = 1.20877 au 
 Jupiter MOID = 2.33186 au 
 T_jup = 3.357 
[ 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-January); 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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