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856 Backlunda (A916 GQ)
Classification: Main-belt Asteroid          SPK-ID: 2000856
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 82 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1194610248063782 1.5281e-08  
a 2.434557197230062 6.1342e-09 au
q 2.143722499499215 3.6246e-08 au
i 14.32787894416386 5.5607e-07 deg
node 125.540298864563 1.7808e-06 deg
peri 72.9249927264281 7.5145e-06 deg
M 189.6967381707518 6.6216e-06 deg
tp 2459856.870215545876
(2022-Oct-04.37021555)
2.6522e-05 TDB
period 1387.485330923555
3.80
5.2439e-06
1.436e-08
d
yr
n .2594622025736101 9.8063e-10 deg/d
Q 2.725391894960909 6.867e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3146  
   data-arc span      32880 days (90.02 yr)  
   first obs. used      1931-02-28  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .37631  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:32:15  

Additional Information
 Earth MOID = 1.19287 au 
 Jupiter MOID = 2.34803 au 
 T_jup = 3.453 
[ 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 10.68   n/a E2021B10  
diameter diameter 45.449 km 0.132 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 12.08 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:
[Binzel, R.P. (1987) Icarus 72, 135-208.]
[Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
[Behrend, R. (2019) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Polakis, T. (2019) Minor Planet Bull. 46, 400-406.]
geometric albedo albedo 0.045   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.680   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=8.72 deg.
SMASSII spectral type spec_B C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

856 Backlunda (A916 GQ)          Discovered 1916-Apr-03 by Belyavskij, S. at Simeis
Discovered at Simeis during the First World War while Simeis was not in communication with the Rechen-Institut for long periods of time were given provisional designations containing the Greek letter SIGMA. These are here abbreviated S.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A916 GQ = 1955 PB = 1955 QO1 = 1958 LA = 1959 SQ = 1962 MA = A908 CB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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