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12993 (1981 EP27)
Classification: Main-belt Asteroid          SPK-ID: 2012993
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03930714336816556 4.1076e-08  
a 2.898885555648704 1.8401e-08 au
q 2.784938645504916 1.1965e-07 au
i 12.49921365448553 4.9475e-06 deg
node 185.7102639458108 1.9996e-05 deg
peri 163.4791722657549 6.433e-05 deg
M 93.97383074074288 6.112e-05 deg
tp 2458129.902666223933
(2018-Jan-11.40266622)
0.00030683 TDB
period 1802.789551346164
4.94
1.7165e-05
4.7e-08
d
yr
n .1996905294526385 1.9013e-09 deg/d
Q 3.012832465792492 1.9124e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1267  
   data-arc span      15040 days (41.18 yr)  
   first obs. used      1978-10-03  
   last obs. used      2019-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56975  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 23:30:18  

Additional Information
 Earth MOID = 1.78111 au 
 Jupiter MOID = 2.16038 au 
 T_jup = 3.251 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.1   n/a MPO344408  
diameter diameter 6.145 km 0.265 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.129   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

12993 (1981 EP27)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20000124/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 EP27 = 1991 HQ1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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