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JPL Small-Body Database Browser
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108197 (2001 HQ21)
Classification: Main-belt Asteroid          SPK-ID: 2108197
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2099370370836384 3.5189e-08  
a 2.253352685562149 9.6385e-09 au
q 1.780290499250772 8.1764e-08 au
i 2.101558215745571 4.7644e-06 deg
node 188.7121610455567 0.00010908 deg
peri 108.043356037094 0.00010993 deg
M 176.7732001642956 1.1536e-05 deg
tp 2458393.824988851383
(2018-Oct-02.32498885)
3.9498e-05 TDB
period 1235.498388955539
3.38
7.9271e-06
2.17e-08
d
yr
n .2913803880427035 1.8695e-09 deg/d
Q 2.726414871873526 1.1662e-08 au
  Orbit Determination Parameters
   # obs. used (total)      584  
   data-arc span      7866 days (21.54 yr)  
   first obs. used      1998-05-24  
   last obs. used      2019-12-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .59148  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 08:59:13  

Additional Information
 Earth MOID = .765842 au 
 Jupiter MOID = 2.48409 au 
 T_jup = 3.595 
[ 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 16.5   n/a MPO449647  

108197 (2001 HQ21)          Discovered 2001-Apr-23 by LINEAR at Socorro
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

[ show close-approach data ]
Alternate Designations
 2001 HQ21 = 1998 OY8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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