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227978 (2007 HD81)
Classification: Main-belt Asteroid          SPK-ID: 2227978
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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .118461675137676 4.9435e-08  
a 3.111797991236285 2.7387e-08 au
q 2.74316918850438 1.4913e-07 au
i 5.98861930812292 5.5877e-06 deg
node 31.0832977966923 3.9197e-05 deg
peri 325.4147451506107 4.498e-05 deg
M 75.26108072320497 1.9509e-05 deg
tp 2458977.336487860871
(2020-May-07.83648786)
0.00010992 TDB
period 2005.005281880841
5.49
2.6469e-05
7.247e-08
d
yr
n .1795506491944469 2.3703e-09 deg/d
Q 3.48042679396819 3.0631e-08 au
  Orbit Determination Parameters
   # obs. used (total)      304  
   data-arc span      6379 days (17.46 yr)  
   first obs. used      2003-07-25  
   last obs. used      2021-01-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55051  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-14 00:41:54  

Additional Information
 Earth MOID = 1.74113 au 
 Jupiter MOID = 1.97477 au 
 T_jup = 3.200 
[ 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 15.90   n/a E2021B55  

227978 (2007 HD81)          Discovered 2007-Apr-25 by Mt. Lemmon Survey at Mount Lemmon
Reference: 20091202/Numbers.arcLast Updated: 2009-12-04

[ show close-approach data ]
Alternate Designations
 2007 HD81 = 2009 TS4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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