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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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1629892192905744 4.9166e-08  
a 2.36577355468771 1.1146e-08 au
q 1.980177969990873 1.1398e-07 au
i 9.589059811835611 5.4269e-06 deg
node 163.938629357735 2.9741e-05 deg
peri 350.5602534396677 3.4011e-05 deg
M 219.7562398655107 1.8264e-05 deg
tp 2457918.272800687330
(2017-Jun-13.77280069)
6.9129e-05 JED
period 1329.101616133858
3.64
9.3924e-06
2.571e-08
d
yr
n .2708596510830993 1.9141e-09 deg/d
Q 2.751369139384547 1.2962e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1079  
   data-arc span      13646 days (37.36 yr)  
   first obs. used      1978-07-05  
   last obs. used      2015-11-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52565  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Nov-30 15:58:09  

Additional Information
 Earth MOID = .990621 au 
 Jupiter MOID = 2.2437 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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