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960 Birgit (A921 TG)
Classification: Main-belt Asteroid          SPK-ID: 2000960
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1653593361524054 2.9922e-08  
a 2.248547844711958 5.1146e-09 au
q 1.876729465803467 6.6521e-08 au
i 3.025810982408767 3.4122e-06 deg
node 249.1489982244416 5.9865e-05 deg
peri 88.07210193329658 6.0883e-05 deg
M 182.0448531668675 1.2924e-05 deg
tp 2459809.279022181714
(2022-Aug-17.77902218)
4.5331e-05 TDB
period 1231.548802524505
3.37
4.202e-06
1.15e-08
d
yr
n .2923148471762139 9.9736e-10 deg/d
Q 2.620366223620449 5.9603e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2998  
   data-arc span      36271 days (99.30 yr)  
   first obs. used      1921-10-01  
   last obs. used      2021-01-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41708  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:51:17  

Additional Information
 Earth MOID = .868496 au 
 Jupiter MOID = 2.75153 au 
 T_jup = 3.609 
[ 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 12.54   n/a E2021B10  
diameter diameter 7.506 km 0.110 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 8.85 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:
[Kryszczynska, A.; Colas, F.; Polinska, M.; Hirsch, R.; et al. (2012) Astron. Astrophys. 546, A72.]
geometric albedo albedo 0.217   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

960 Birgit (A921 TG)          Discovered 1921-Oct-01 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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