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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1629607901913591 4.9327e-08  
a 2.365374910775423 1.14e-08 AU
q 1.979911546216644 1.1446e-07 AU
i 9.588125505583596 5.6426e-06 deg
node 163.9462442875126 3.5938e-05 deg
peri 350.4337432600686 4.1118e-05 deg
M 57.3792037250596 2.0065e-05 deg
tp 2456588.712452056889
(2013-Oct-23.21245206)
7.3707e-05 JED
period 1328.765690525287
3.64
9.6064e-06
2.63e-08
d
yr
n .2709281271837211 1.9587e-09 deg/d
Q 2.750838275334201 1.3258e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      930  
   data-arc span      13144 days (35.99 yr)  
   first obs. used      1978-07-05  
   last obs. used      2014-06-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52661  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jul-14 12:18:21  

Additional Information
 Earth MOID = .990559 AU 
 T_jup = 3.512 
[ 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 14.1 mag n/a MPO256923  
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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