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12717 (1991 HK)
Classification: Main-belt Asteroid          SPK-ID: 2012717
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1637668691172349 4.2224e-08  
a 2.216193057444792 7.7788e-09 au
q 1.853254059067706 9.3587e-08 au
i 5.227146334724009 5.0004e-06 deg
node 167.9728436304739 3.7037e-05 deg
peri 54.91080393903962 3.9132e-05 deg
M 171.3803414746157 1.3859e-05 deg
tp 2458026.821842044072
(2017-Sep-30.32184204)
4.5462e-05 TDB
period 1205.063165863301
3.30
6.3447e-06
1.737e-08
d
yr
n .2987395268546756 1.5729e-09 deg/d
Q 2.579132055821878 9.0527e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1339  
   data-arc span      10044 days (27.50 yr)  
   first obs. used      1991-04-16  
   last obs. used      2018-10-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51692  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-Oct-30 17:07:21  

Additional Information
 Earth MOID = .851119 au 
 Jupiter MOID = 2.40224 au 
 T_jup = 3.630 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.1   n/a MPO350903  
diameter diameter 2.778 km 0.285 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.275   0.124 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

12717 (1991 HK)          Discovered 1991-Apr-16 by Sugie, A. at Dynic
Reference: 19991222/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1991 HK = 1998 QJ7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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