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39777 (1997 HE)
Classification: Main-belt Asteroid          SPK-ID: 2039777
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1183908811189253 4.23e-08  
a 2.800498932390231 1.6099e-08 au
q 2.468945396211942 1.1979e-07 au
i 7.431607278373192 4.7931e-06 deg
node 201.1311138688031 3.4791e-05 deg
peri 150.1751979347033 3.9343e-05 deg
M 100.6833548705626 1.8831e-05 deg
tp 2458121.752276885240
(2018-Jan-03.25227689)
8.8981e-05 TDB
period 1711.794174348716
4.69
1.4761e-05
4.041e-08
d
yr
n .2103056578849316 1.8135e-09 deg/d
Q 3.13205246856852 1.8005e-08 au
  Orbit Determination Parameters
   # obs. used (total)      967  
   data-arc span      7926 days (21.70 yr)  
   first obs. used      1997-04-27  
   last obs. used      2019-01-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54133  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 02:08:25  

Additional Information
 Earth MOID = 1.46623 au 
 Jupiter MOID = 2.33013 au 
 T_jup = 3.303 
[ 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 14.6   n/a MPO426182  
diameter diameter 4.197 km 0.805 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.159   0.125 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

39777 (1997 HE)          Discovered 1997-Apr-27 by Spacewatch at Kitt Peak
Reference: 20020526/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1997 HE = 1999 TY177 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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