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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1183784096506384 4.9434e-08  
a 3.111043595357273 2.7389e-08 au
q 2.742763202185075 1.4909e-07 au
i 5.98911109967146 5.5882e-06 deg
node 31.08671978231786 3.9194e-05 deg
peri 325.3071668428527 4.4986e-05 deg
M 40.16538527694861 1.9631e-05 deg
tp 2458976.881871362163
(2020-May-07.38187136)
0.00011 TDB
period 2004.27621332498
5.49
2.6468e-05
7.247e-08
d
yr
n .1796159619151396 2.372e-09 deg/d
Q 3.479323988529472 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 = 1.73988 au 
 Jupiter MOID = 1.97537 au 
 T_jup = 3.200 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457757.5 (2017-Jan-04.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1229896265468524 5.0136e-08  
q 2.726844968721603 1.5225e-07 au
tp 2456966.155367820246
(2014-Nov-04.65536782)
0.00011202 TDB
node 31.20436910318464 3.9019e-05 deg
peri 324.3396708209874 4.427e-05 deg
i 6.008954035753598 5.6012e-06 deg
  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
 Jupiter MOID = 1.97537 au 
 T_jup = 3.200 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.51359941681129E-15 -7.546711601763183E-15 3.048444812653047E-13 6.261571840428617E-15 7.046312496954901E-15 -7.772121257674976E-16
q -7.546711601763183E-15 2.317904716659195E-14 -2.098658029504841E-12 -2.388111617992242E-14 -1.992385075823443E-13 3.333169403674329E-15
tp 3.048444812653047E-13 -2.098658029504841E-12 1.254780508374116E-8 8.436907891694939E-12 2.346485257460521E-9 -1.631473325472757E-12
node 6.261571840428617E-15 -2.388111617992242E-14 8.436907891694939E-12 1.52245418756689E-9 -1.51217090947482E-9 -1.880144491304719E-11
peri 7.046312496954901E-15 -1.992385075823443E-13 2.346485257460521E-9 -1.51217090947482E-9 1.959800089671838E-9 1.842967936099455E-11
i -7.772121257674976E-16 3.333169403674329E-15 -1.631473325472757E-12 -1.880144491304719E-11 1.842967936099455E-11 3.137377648793487E-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 15.90   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

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