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6487 Tonyspear (1991 GA1)
Classification: Mars-crossing Asteroid          SPK-ID: 2006487
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3054371117661647 2.7117e-08  
a 2.357051007091197 4.1878e-09 au
q 1.637120155199732 6.5331e-08 au
i 21.26986025607284 4.0235e-06 deg
node 187.4649344666053 8.4364e-06 deg
peri 92.93527816520469 1.1454e-05 deg
M 23.51018071642323 7.556e-06 deg
tp 2459114.181205833833
(2020-Sep-21.68120583)
2.7596e-05 TDB
period 1321.757849275589
3.62
3.5226e-06
9.644e-09
d
yr
n .2723645637491797 7.2587e-10 deg/d
Q 3.076981858982662 5.4669e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2157  
   data-arc span      17397 days (47.63 yr)  
   first obs. used      1973-05-04  
   last obs. used      2020-12-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4519  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 18:48:36  

Additional Information
 Earth MOID = .778607 au 
 Jupiter MOID = 2.4592 au 
 T_jup = 3.402 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456767.5 (2014-Apr-20.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3061227916785643 2.7117e-08  
q 1.634909924024857 6.5299e-08 au
tp 2456470.525103651865
(2013-Jun-27.02510365)
2.3635e-05 TDB
node 187.540454222445 8.445e-06 deg
peri 92.84243233970834 1.1429e-05 deg
i 21.25952904384203 4.0221e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2157  
   data-arc span      17397 days (47.63 yr)  
   first obs. used      1973-05-04  
   last obs. used      2020-12-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4519  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 18:48:36  

Additional Information
 Jupiter MOID = 2.4592 au 
 T_jup = 3.402 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.353189390282622E-16 -1.769356514876143E-15 -2.572962355511011E-13 2.421862983679512E-15 -6.823574855034823E-14 -8.375977866955918E-15
q -1.769356514876143E-15 4.263956220511882E-15 6.35486049774478E-13 -6.113392568931553E-15 1.702812613932883E-13 2.055220467927484E-14
tp -2.572962355511011E-13 6.35486049774478E-13 5.586139942566048E-10 -6.225770770502179E-12 1.875439544139233E-10 8.498998842558121E-12
node 2.421862983679512E-15 -6.113392568931553E-15 -6.225770770502179E-12 7.131790628093551E-11 -6.815620155134984E-11 9.434046810772279E-12
peri -6.823574855034823E-14 1.702812613932883E-13 1.875439544139233E-10 -6.815620155134984E-11 1.306195070172165E-10 -6.421710553745974E-12
i -8.375977866955918E-15 2.055220467927484E-14 8.498998842558121E-12 9.434046810772279E-12 -6.421710553745974E-12 1.617766601749919E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.68   n/a E2021B10  
rotation period rot_per 74.91 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Stephens, R.D.; Coley, D.R. (2013) Minor Planet Bull. 40, 203-204.]
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]

6487 Tonyspear (1991 GA1)          Discovered 1991-Apr-08 by Helin, E. F. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1991 GA1 = 1973 JB = 1988 RF8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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