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1651 Behrens (1936 HD)
Classification: Main-belt Asteroid          SPK-ID: 2001651
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 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06615200740980436 3.7916e-08  
a 2.180176964828048 5.1863e-09 au
q 2.035953882096059 8.1829e-08 au
i 5.075861614193558 3.7041e-06 deg
node 187.4489227367098 3.9909e-05 deg
peri 339.7739059694989 4.687e-05 deg
M 154.8101810806918 2.495e-05 deg
tp 2458694.869730816377
(2019-Jul-30.36973082)
8.1405e-05 TDB
period 1175.807014987123
3.22
4.1956e-06
1.149e-08
d
yr
n .3061726928070273 1.0925e-09 deg/d
Q 2.324400047560038 5.5294e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3029  
   data-arc span      30917 days (84.65 yr)  
   first obs. used      1936-04-23  
   last obs. used      2020-12-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41879  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:57:07  

Additional Information
 Earth MOID = 1.04218 au 
 Jupiter MOID = 2.64053 au 
 T_jup = 3.673 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456417.5 (2013-May-05.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0657077127532075 3.7923e-08  
q 2.036369169909328 8.1792e-08 au
tp 2456342.649315404718
(2013-Feb-19.14931540)
8.1859e-05 TDB
node 187.5314714088069 3.9941e-05 deg
peri 339.3379772845473 4.6988e-05 deg
i 5.073542421020414 3.7026e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3029  
   data-arc span      30917 days (84.65 yr)  
   first obs. used      1936-04-23  
   last obs. used      2020-12-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41879  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:57:07  

Additional Information
 Jupiter MOID = 2.64053 au 
 T_jup = 3.673 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.438150928217276E-15 -3.096754355179325E-15 -9.679366190912383E-13 -2.870740954604555E-15 -2.846897496487399E-13 1.806733129265596E-16
q -3.096754355179325E-15 6.689974213377737E-15 2.08992280876964E-12 6.020813271949468E-15 6.137895108340165E-13 -3.375106740924434E-16
tp -9.679366190912383E-13 2.08992280876964E-12 6.700951767888499E-9 -2.518970600760413E-12 2.037288322265537E-9 1.020560568541086E-13
node -2.870740954604555E-15 6.020813271949468E-15 -2.518970600760413E-12 1.595307934478687E-9 -1.589493527678078E-9 -5.241726385137112E-11
peri -2.846897496487399E-13 6.137895108340165E-13 2.037288322265537E-9 -1.589493527678078E-9 2.207917396495897E-9 5.227044263281846E-11
i 1.806733129265596E-16 -3.375106740924434E-16 1.020560568541086E-13 -5.241726385137112E-11 5.227044263281846E-11 1.370939177167318E-11

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 12.17   n/a E2021B10  
diameter diameter 8.963 km 0.113 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 34.34 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:
[Behrend, R. (2001) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.318   0.052 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

1651 Behrens           Discovered 1936 Apr. 23 by M. Laugier at Nice.
Named in memory of Johann Gerhard Behrens (1889-1978), pastor at Detern, well known for his orbit computations on comets and minor planets. Name proposed by O. Kippes, who found some of the identifications involving this planet.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC 5523Last Updated: 2006-03-21

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Alternate Designations
 1936 HD = 1939 EJ = 1940 QD = 1944 YA = 1947 WA = 1950 TB4 = 1952 FF = 1952 HB = 1952 KG = 1958 BC = 1961 AB = 1963 UQ 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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