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21361 Carsonmark (1997 HQ)
Classification: Main-belt Asteroid          SPK-ID: 2021361
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09413350909863769 4.2345e-08  
a 2.463867648764358 7.8324e-09 au
q 2.231935141031559 1.0264e-07 au
i 5.94925435668335 5.0171e-06 deg
node 210.6539702164031 2.791e-05 deg
peri 217.1311086209689 4.031e-05 deg
M 129.9258172662421 2.6826e-05 deg
tp 2458490.679321993099
(2019-Jan-07.17932199)
0.00010548 TDB
period 1412.617199139
3.87
6.7358e-06
1.844e-08
d
yr
n .254846111331097 1.2152e-09 deg/d
Q 2.695800156497157 8.5697e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2145  
   data-arc span      12424 days (34.02 yr)  
   first obs. used      1986-07-13  
   last obs. used      2020-07-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4891  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:57:28  

Additional Information
 Earth MOID = 1.24862 au 
 Jupiter MOID = 2.55753 au 
 T_jup = 3.475 
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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 14.0   n/a MPO324506  
rotation period rot_per 20.22 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 [Result based on fragmentary lightcurve(s), may be completely wrong.]

21361 Carsonmark           Discovered 1997 Apr. 28 by Spacewatch at Kitt Peak.
Jordan Carson Mark (1913-1997) worked as a physicist and administrator at Los Alamos National Laboratory and as an advisor on the safety of nuclear reactors. Name suggested and citation prepared by Robert Jedicke and Peter Jedicke.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2016-08-18Last Updated: 2016-11-23

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Alternate Designations
 1997 HQ = 1998 QR14 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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