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2928 Epstein (1976 GN8)
Classification: Main-belt Asteroid          SPK-ID: 2002928
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06422766651771984 3.4312e-08  
a 3.005818769972927 1.4094e-08 au
q 2.812762044402403 1.0659e-07 au
i 9.54244817251457 4.0255e-06 deg
node 310.3389593879765 2.0179e-05 deg
peri 157.1610138998892 3.5941e-05 deg
M 249.0394233142975 2.9874e-05 deg
tp 2459587.190180493664
(2022-Jan-07.69018049)
0.00015838 TDB
period 1903.455004347806
5.21
1.3387e-05
3.665e-08
d
yr
n .1891297662291467 1.3302e-09 deg/d
Q 3.198875495543452 1.4999e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2736  
   data-arc span      18996 days (52.01 yr)  
   first obs. used      1968-10-22  
   last obs. used      2020-10-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41569  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:04:43  

Additional Information
 Earth MOID = 1.83193 au 
 Jupiter MOID = 1.88869 au 
 T_jup = 3.227 
[ 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 11.5   n/a MPO435725  
diameter diameter 15.267 km 1.967 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 8.509 h n/a LCDB (Rev. 2019-August); 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.204   0.245 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

2928 Epstein (1976 GN8)          Discovered 1976-Apr-05 by Felix Aguilar Observatory at El Leoncito
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1976 GN8 = 1968 UD = 1976 HU = 1981 EX2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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