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8251 Isogai (1980 VA)
Classification: Mars-crossing Asteroid          SPK-ID: 2008251
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2639597454852619 3.7046e-08  
a 2.254269976678348 6.484e-09 au
q 1.659233447379264 8.4869e-08 au
i 3.210493773462546 4.7286e-06 deg
node 169.2026164812216 6.3604e-05 deg
peri 233.0876592716203 6.4091e-05 deg
M 251.0053740933812 8.8341e-06 deg
tp 2459374.791445770639
(2021-Jun-09.29144577)
3.1275e-05 TDB
period 1236.252882714353
3.38
5.3338e-06
1.46e-08
d
yr
n .2912025565591187 1.2564e-09 deg/d
Q 2.849306505977432 8.1955e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1364  
   data-arc span      14079 days (38.55 yr)  
   first obs. used      1980-10-13  
   last obs. used      2019-05-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53194  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 18:54:40  

Additional Information
 Earth MOID = .670137 au 
 Jupiter MOID = 2.56678 au 
 T_jup = 3.576 
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Orbital Elements at Epoch 2456626.5 (2013-Nov-30.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2638616960727048 3.6977e-08  
q 1.659037978531383 8.4615e-08 au
tp 2456904.230849336932
(2014-Sep-03.73084934)
2.6601e-05 TDB
node 169.2635718640668 6.3654e-05 deg
peri 233.1648864663372 6.414e-05 deg
i 3.208631500944294 4.7281e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1364  
   data-arc span      14079 days (38.55 yr)  
   first obs. used      1980-10-13  
   last obs. used      2019-05-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53194  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 18:54:40  

Additional Information
 Jupiter MOID = 2.56678 au 
 T_jup = 3.576 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.367273197270769E-15 -3.124048810695441E-15 -3.563999452315791E-13 -1.502289822626099E-15 -8.181445825770948E-14 -6.943483712029595E-16
q -3.124048810695441E-15 7.159660811319713E-15 8.366967400815115E-13 3.15239330696849E-15 1.915659000831672E-13 1.624852636433971E-15
tp -3.563999452315791E-13 8.366967400815115E-13 7.076052847145016E-10 -3.905803340517129E-12 2.173495120093867E-10 2.796795446421062E-13
node -1.502289822626099E-15 3.15239330696849E-15 -3.905803340517129E-12 4.051836635164401E-9 -4.046060296319258E-9 4.889488377143599E-11
peri -8.181445825770948E-14 1.915659000831672E-13 2.173495120093867E-10 -4.046060296319258E-9 4.113999173689243E-9 -4.874168744322761E-11
i -6.943483712029595E-16 1.624852636433971E-15 2.796795446421062E-13 4.889488377143599E-11 -4.874168744322761E-11 2.235449601227609E-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 15.3   n/a MPO337325  
diameter diameter 4.339 km 1.061 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  
geometric albedo albedo 0.079   0.052 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  

8251 Isogai           Discovered 1980 Nov. 8 by T. Furuta at Tokai.
Rensuke Isogai (b. 1941), a high-school classmate of the discoverer, is an electrical engineer and amateur astronomer. He influenced the discoverer in astronomy, who began to observe stars with a telescope borrowed from him.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20001013/MPCPages.arcLast Updated: 2013-03-29

Alternate Designations
 1980 VA = 1980 VL = 1990 RX 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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