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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2720804253140527 3.2674e-08  
a 2.328059423533815 7.4948e-09 au
q 1.694640025422346 7.5017e-08 au
i 10.77455876202622 3.6267e-06 deg
node 139.1111758119635 1.6427e-05 deg
peri 181.3323250202153 1.7986e-05 deg
M 120.9567417246291 6.2984e-06 deg
tp 2458564.569658434600
(2019-Mar-22.06965843)		 2.1828e-05 TDB
period 1297.446679911591
3.55		 6.2654e-06
1.715e-08		 d
yr
n .2774680498041975 1.3399e-09 deg/d
Q 2.961478821645283 9.534e-09 au
   Orbit Determination Parameters
   # obs. used (total)      1152  
   data-arc span      8600 days (23.55 yr)  
   first obs. used      1997-04-30  
   last obs. used      2020-11-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .523  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 22:07:47  

Additional Information
 Earth MOID = .681823 au 
 Jupiter MOID = 2.37346 au 
 T_jup = 3.500 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457433.5 (2016-Feb-15.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2727526194382923 3.2563e-08  
q 1.692533903007229 7.4756e-08 au
tp 2457268.089868665984
(2015-Sep-02.58986867)		 2.0249e-05 TDB
node 139.1647690871198 1.6425e-05 deg
peri 181.3777458068391 1.7976e-05 deg
i 10.7770410215915 3.6273e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      1152  
   data-arc span      8600 days (23.55 yr)  
   first obs. used      1997-04-30  
   last obs. used      2020-11-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .523  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 22:07:47  

Additional Information
 Jupiter MOID = 2.37346 au 
 T_jup = 3.500 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.060325731604562E-15 -2.428121683351671E-15 -2.076428351909577E-13 1.618655196534664E-15 -8.946254074198532E-14 -1.051734646682957E-15
q -2.428121683351671E-15 5.588391399508026E-15 4.927296419587537E-13 -3.569086221077934E-15 2.106826009862844E-13 2.201663084286098E-15
tp -2.076428351909577E-13 4.927296419587537E-13 4.100217535479784E-10 -2.128732883463015E-12 1.544158905210252E-10 -1.163304500179053E-12
node 1.618655196534664E-15 -3.569086221077934E-15 -2.128732883463015E-12 2.697741952492949E-10 -2.650864570687674E-10 -5.704280501332636E-12
peri -8.946254074198532E-14 2.106826009862844E-13 1.544158905210252E-10 -2.650864570687674E-10 3.231200615664092E-10 5.200812741983747E-12
i -1.051734646682957E-15 2.201663084286098E-15 -1.163304500179053E-12 -5.704280501332636E-12 5.200812741983747E-12 1.315747434640047E-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 15.3   n/a MPO502634  
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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