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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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09364608122353593 1.7198e-08  
a 2.464997722560206 7.1392e-09 au
q 2.234160345617502 4.2374e-08 au
i 5.948028915280559 5.9061e-07 deg
node 210.6314852648717 5.4809e-06 deg
peri 216.9503491713018 1.6813e-05 deg
M 231.0487918801567 1.3315e-05 deg
tp 2459902.844532650804
(2022-Nov-19.34453265)
5.2993e-05 TDB
period 1413.589173859311
3.87
6.1411e-06
1.681e-08
d
yr
n .2546708808027625 1.1064e-09 deg/d
Q 2.695835099502911 7.8077e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2325  
   data-arc span      12811 days (35.07 yr)  
   first obs. used      1986-07-13  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4825  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:42:11  

Additional Information
 Earth MOID = 1.25045 au 
 Jupiter MOID = 2.55733 au 
 T_jup = 3.474 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457250.5 (2015-Aug-16.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09300939841260004 1.6766e-08  
q 2.235496540929429 4.0991e-08 au
tp 2457079.044500168073
(2015-Feb-25.54450017)
5.1339e-05 TDB
node 210.7025961859546 5.4863e-06 deg
peri 217.571548087847 1.7016e-05 deg
i 5.943572344574418 5.9015e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2325  
   data-arc span      12811 days (35.07 yr)  
   first obs. used      1986-07-13  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4825  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:42:11  

Additional Information
 Jupiter MOID = 2.55733 au 
 T_jup = 3.474 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.811005359569491E-16 -6.785192220857535E-16 -7.298052812931738E-13 1.78165834449628E-14 -2.26547127378444E-13 1.725533987947645E-15
q -6.785192220857535E-16 1.680261245645782E-15 1.81873981790367E-12 -4.376623553674966E-14 5.641464027810946E-13 -4.238260859925176E-15
tp -7.298052812931738E-13 1.81873981790367E-12 2.63570801020945E-9 -7.989304043523141E-11 8.282710839744658E-10 -6.42192760851922E-12
node 1.78165834449628E-14 -4.376623553674966E-14 -7.989304043523141E-11 3.009920588486743E-11 -5.328883601311919E-11 1.739797634030106E-12
peri -2.26547127378444E-13 5.641464027810946E-13 8.282710839744658E-10 -5.328883601311919E-11 2.895309858303518E-10 -3.624013086993307E-12
i 1.725533987947645E-15 -4.238260859925176E-15 -6.42192760851922E-12 1.739797634030106E-12 -3.624013086993307E-12 3.482810877185652E-13

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.05   n/a MPO636385  
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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