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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 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1629755859060747 4.9282e-08  
a 2.365697817197486 1.1407e-08 AU
q 1.980146829363003 1.1436e-07 AU
i 9.588178863732532 5.6273e-06 deg
node 163.941301401353 3.5925e-05 deg
peri 350.4858994423448 4.1099e-05 deg
M 111.508447398249 2.015e-05 deg
tp 2456588.836275723406
(2013-Oct-23.33627572)
7.3678e-05 JED
period 1329.037792179867
3.64
9.6127e-06
2.632e-08
d
yr
n .2708726584889159 1.9592e-09 deg/d
Q 2.751248805031968 1.3266e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      939  
   data-arc span      13204 days (36.15 yr)  
   first obs. used      1978-07-05  
   last obs. used      2014-08-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52466  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Sep-12 13:52:41  

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 (809)
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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