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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1187708026556033 4.219e-08  
a 2.799561293762526 1.491e-08 au
q 2.467055151818792 1.1893e-07 au
i 7.432559092330696 4.3997e-06 deg
node 201.118272823131 3.2115e-05 deg
peri 150.1324483478809 3.5687e-05 deg
M 184.869032676231 1.7548e-05 deg
tp 2459832.826732014718
(2022-Sep-10.32673201)
8.6217e-05 TDB
period 1710.934554317575
4.68
1.3668e-05
3.742e-08
d
yr
n .2104113211645257 1.6809e-09 deg/d
Q 3.132067435706261 1.6681e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1091  
   data-arc span      8400 days (23.00 yr)  
   first obs. used      1997-04-27  
   last obs. used      2020-04-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52549  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 08:46:08  

Additional Information
 Earth MOID = 1.46524 au 
 Jupiter MOID = 2.33359 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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