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79400 (1997 HQ2)
Classification: Main-belt Asteroid          SPK-ID: 2079400
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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2721171403863842 3.2398e-08  
a 2.32812697286833 7.4883e-09 au
q 1.694603718554991 7.4416e-08 au
i 10.77522793273103 3.6257e-06 deg
node 139.1097155241524 1.6177e-05 deg
peri 181.3573542889241 1.765e-05 deg
M 176.408736816407 6.3357e-06 deg
tp 2458564.691967960609
(2019-Mar-22.19196796)
2.1456e-05 TDB
period 1297.503149021429
3.55
6.26e-06
1.714e-08
d
yr
n .2774559740155624 1.3386e-09 deg/d
Q 2.96165022718167 9.5259e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1162  
   data-arc span      8661 days (23.71 yr)  
   first obs. used      1997-04-30  
   last obs. used      2021-01-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52192  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 07:18:50  

Additional Information
 Earth MOID = .679818 au 
 Jupiter MOID = 2.37344 au 
 T_jup = 3.500 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457489.5 (2016-Apr-11.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2727525331509258 3.23e-08  
q 1.692485530317378 7.419e-08 au
tp 2457268.079112505921
(2015-Sep-02.57911251)
1.9748e-05 TDB
node 139.1639301934927 1.6177e-05 deg
peri 181.3722672112046 1.7643e-05 deg
i 10.77702537721839 3.6261e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1162  
   data-arc span      8661 days (23.71 yr)  
   first obs. used      1997-04-30  
   last obs. used      2021-01-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52192  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 07:18:50  

Additional Information
 Jupiter MOID = 2.37344 au 
 T_jup = 3.500 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.043311111065196E-15 -2.390264763072916E-15 -1.892168994707046E-13 1.822784700286771E-15 -8.142212790411593E-14 -1.078986019016206E-15
q -2.390264763072916E-15 5.504155588872232E-15 4.51733596787722E-13 -4.051342051645052E-15 1.928188019367221E-13 2.262485488461683E-15
tp -1.892168994707046E-13 4.51733596787722E-13 3.900001914019869E-10 -2.018793970847184E-12 1.453521470518093E-10 -1.140335775238533E-12
node 1.822784700286771E-15 -4.051342051645052E-15 -2.018793970847184E-12 2.617004023090228E-10 -2.571305053586721E-10 -5.491233407200096E-12
peri -8.142212790411593E-14 1.928188019367221E-13 1.453521470518093E-10 -2.571305053586721E-10 3.112734707838784E-10 5.002518344533448E-12
i -1.078986019016206E-15 2.262485488461683E-15 -1.140335775238533E-12 -5.491233407200096E-12 5.002518344533448E-12 1.314894566366027E-11

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 15.29   n/a E2021B10  
diameter diameter 2.382 km 0.559 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
geometric albedo albedo 0.248   0.109 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

79400 (1997 HQ2)          Discovered 1997-Apr-30 by Spacewatch at Kitt Peak
Reference: 20040504/Numbers.arcLast Updated: 2004-07-16

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Alternate Designations
 1997 HQ2 = 2001 QK31 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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