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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 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1629755855494342 4.9241e-08  
a 2.365697817406077 1.1382e-08 AU
q 1.980146830381303 1.1423e-07 AU
i 9.588179592818904 5.5898e-06 deg
node 163.9413084987697 3.5412e-05 deg
peri 350.48589130822 4.0473e-05 deg
M 111.5084482652745 1.9916e-05 deg
tp 2456588.836272468100
(2013-Oct-23.33627247)
7.2776e-05 JED
period 1329.037792355645
3.64
9.5912e-06
2.626e-08
d
yr
n .2708726584530904 1.9548e-09 deg/d
Q 2.75124880443085 1.3237e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      961  
   data-arc span      13493 days (36.94 yr)  
   first obs. used      1978-07-05  
   last obs. used      2015-06-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52334  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-06 11:58:07  

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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