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7964 (1995 DD2)
Classification: Main-belt Asteroid          SPK-ID: 2007964
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08879494111251444 1.9338e-08  
a 2.758923172053295 1.0238e-08 au
q 2.513944751456872 5.2941e-08 au
i 10.2459332273831 8.806e-07 deg
node 163.2994125565613 4.2083e-06 deg
peri 81.94945769656908 1.2205e-05 deg
M 142.210729621182 1.1256e-05 deg
tp 2458539.292606801567
(2019-Feb-24.79260680)
5.0928e-05 TDB
period 1673.816470708699
4.58
9.3173e-06
2.551e-08
d
yr
n .2150773434841246 1.1972e-09 deg/d
Q 3.003901592649719 1.1147e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2579  
   data-arc span      16062 days (43.98 yr)  
   first obs. used      1977-03-15  
   last obs. used      2021-03-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44335  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-16 20:16:34  

Additional Information
 Earth MOID = 1.52563 au 
 Jupiter MOID = 2.054 au 
 T_jup = 3.313 
[ 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 12.59   n/a E2021B10  
diameter diameter 7.980 km 0.086 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 10.224 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
geometric albedo albedo 0.304   0.054 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

7964 (1995 DD2)          Discovered 1995-Feb-23 by Shimizu, Y., Urata, T. at Nachi-Katsuura
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1995 DD2 = 1977 EG4 = 1982 JP4 = 1986 EY 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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