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1781 Van Biesbroeck (A906 UB)
Classification: Main-belt Asteroid          SPK-ID: 2001781
[ 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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1071176320039352 1.6879e-08  
a 2.394882317216235 6.6566e-09 au
q 2.138348194467935 3.9793e-08 au
i 6.945985949208125 4.6754e-07 deg
node 44.55630406729082 6.4262e-06 deg
peri 342.4347723442577 1.1349e-05 deg
M 342.4500444800428 1.1561e-05 deg
tp 2459462.493051766191
(2021-Sep-04.99305177)		 4.3622e-05 TDB
period 1353.707056910338
3.71		 5.644e-06
1.545e-08		 d
yr
n .265936413762704 1.1088e-09 deg/d
Q 2.651416439964536 7.3696e-09 au
   Orbit Determination Parameters
   # obs. used (total)      2697  
   data-arc span      41892 days (114.69 yr)  
   first obs. used      1906-10-17  
   last obs. used      2021-06-27  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43811  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 12:47:16  

Additional Information
 Earth MOID = 1.14363 au 
 Jupiter MOID = 2.77585 au 
 T_jup = 3.512 
[ 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 12.92   n/a E2021B10  
diameter diameter 8.500 km 0.126 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 6.385 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:
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
geometric albedo albedo 0.203   0.023 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

1781 Van Biesbroeck (A906 UB)          Discovered 1906-Oct-17 by Kopff, A. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A906 UB = 1954 SZ = 1958 VP = 1969 TM2 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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