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7916 (1981 EN)
Classification: Main-belt Asteroid          SPK-ID: 2007916
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1629755861181984 4.9243e-08  
a 2.365697817087308 1.1387e-08 AU
q 1.980146828768961 1.1424e-07 AU
i 9.58817920865441 5.5971e-06 deg
node 163.9413045931452 3.5535e-05 deg
peri 350.4858968786406 4.0613e-05 deg
M 111.5084469521672 1.9962e-05 deg
tp 2456588.836277398997
(2013-Oct-23.33627740)
7.2955e-05 JED
period 1329.037792087021
3.64
9.5956e-06
2.627e-08
d
yr
n .270872658507839 1.9557e-09 deg/d
Q 2.751248805405654 1.3243e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      957  
   data-arc span      13466 days (36.87 yr)  
   first obs. used      1978-07-05  
   last obs. used      2015-05-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51999  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jun-04 15:59:52  

Additional Information
 Earth MOID = .991192 AU 
 T_jup = 3.511 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.2 mag n/a MPO302114  
diameter diameter 12.05 km 2.3 IRAS-A-FPA-3-RDR-IMPS-V5.0 IRAS observations used: 2
geometric albedo albedo 0.0212   0.011 EAR-A-5-DDR-ALBEDOS-V1.0:IMPS IMPS quality code 1: at least two valid IRAS band observations used

7916 (1981 EN)          Discovered 1981-Mar-01 by Debehogne, H., DeSanctis, G. at La Silla
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1981 EN = 1981 EG35 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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