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321326 (2009 HJ77)
Classification: Main-belt Asteroid          SPK-ID: 2321326
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1459240059112537 5.9537e-08  
a 2.260639898228869 1.5537e-08 au
q 1.930758268356504 1.3631e-07 au
i 6.200255900808384 9.0498e-06 deg
node 204.0207539126846 6.607e-05 deg
peri 40.91529564261637 7.521e-05 deg
M 77.6731919018504 3.6269e-05 deg
tp 2458732.636116556707
(2019-Sep-06.13611656)
0.00012476 TDB
period 1241.496527675055
3.40
1.2799e-05
3.504e-08
d
yr
n .2899726193146673 2.9894e-09 deg/d
Q 2.590521528101235 1.7805e-08 au
  Orbit Determination Parameters
   # obs. used (total)      116  
   data-arc span      6230 days (17.06 yr)  
   first obs. used      2002-04-04  
   last obs. used      2019-04-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54625  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-14 12:12:11  

Additional Information
 Earth MOID = .922974 au 
 Jupiter MOID = 2.42529 au 
 T_jup = 3.598 
[ 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 17.7   n/a MPO427673  

321326 (2009 HJ77)          Discovered 2009-Apr-29 by Lowe, A. at Mayhill
Reference: 20120308/Numbers.arcLast Updated: 2012-03-13

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1978-Jan-14 10:13 < 00:01 Iris 0.0358502760839948 0.0358473924613273 0.0358531629019547 7.49556091096275 7.49556088956952 2443522.925735787 0.441692423368813 603.497315611872 59.4956435386929 -77.4041728713203 87979.8315181197 T 8 CATAB v2.0e-lin.ifort 2019-Jul-14 12:12:13 2019-Jul-14 12:12
2075-Aug-04 22:19 00:14 Psych 0.0197037981985879 0.0196929460036666 0.0197146511114032 2.94626257591586 2.94626236749952 2479154.429794348 13.614969053498 571.899731835798 35.2300138325956 -19.1845827861813 27872.7444768942 T 8 CATAB v2.0e-lin.ifort 2019-Jul-14 12:12:13 2019-Jul-14 12:12
2186-Dec-05 02:12 00:03 Iris 0.0207215632965322 0.0206596670958398 0.0207834867342007 7.76458413695077 7.76458410122083 2519818.591949423 2.93901725638103 3306.31505346164 51.1716695727264 20.9994807027264 21721.4582012782 T 8 CATAB v2.0e-lin.ifort 2019-Jul-14 12:12:13 2019-Jul-14 12:12
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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