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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 ]

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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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09364608077605084 1.7646e-08  
a 2.464997722476474 7.1825e-09 au
q 2.23416034664466 4.3325e-08 au
i 5.948028907685017 5.9172e-07 deg
node 210.6314852059821 5.4935e-06 deg
peri 216.9503495925326 1.7166e-05 deg
M 231.0487915941545 1.3536e-05 deg
tp 2459902.844533748031
(2022-Nov-19.34453375)
5.3807e-05 TDB
period 1413.589173787284
3.87
6.1783e-06
1.692e-08
d
yr
n .2546708808157387 1.1131e-09 deg/d
Q 2.695835098308287 7.8551e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2272  
   data-arc span      12770 days (34.96 yr)  
   first obs. used      1986-07-13  
   last obs. used      2021-06-29  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48718  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:32:44  

Additional Information
 Earth MOID = 1.25045 au 
 Jupiter MOID = 2.55733 au 
 T_jup = 3.474 
[ 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 14.04   n/a E2021B10  
rotation period rot_per 20.22 h n/a LCDB (Rev. 2020-October); 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

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