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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2639597729588934 3.6861e-08  
a 2.25426997761384 6.4683e-09 au
q 1.659233386134841 8.4439e-08 au
i 3.210493198826766 4.6876e-06 deg
node 169.2026606598737 6.3148e-05 deg
peri 233.0876209378502 6.3626e-05 deg
M 251.0053711484789 8.8195e-06 deg
tp 2459374.791456116528
(2021-Jun-09.29145612)
3.1232e-05 TDB
period 1236.252883483896
3.38
5.3209e-06
1.457e-08
d
yr
n .2912025563778509 1.2533e-09 deg/d
Q 2.849306569092839 8.1757e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1376  
   data-arc span      14514 days (39.74 yr)  
   first obs. used      1980-10-13  
   last obs. used      2020-07-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53363  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:22:11  

Additional Information
 Earth MOID = .670137 au 
 Jupiter MOID = 2.56678 au 
 T_jup = 3.576 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456683.5 (2014-Jan-26.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2638344043125156 3.6787e-08  
q 1.6590268486387 8.4166e-08 au
tp 2456904.250954759361
(2014-Sep-03.75095476)
2.6496e-05 TDB
node 169.2617787870478 6.3195e-05 deg
peri 233.173953351915 6.3673e-05 deg
i 3.208717651904607 4.6872e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1376  
   data-arc span      14514 days (39.74 yr)  
   first obs. used      1980-10-13  
   last obs. used      2020-07-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53363  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:22:11  

Additional Information
 Jupiter MOID = 2.56678 au 
 T_jup = 3.576 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.353267808707329E-15 -3.09150692215139E-15 -3.588283982873899E-13 -1.860754985063832E-15 -8.319850305888699E-14 -6.474423469005423E-16
q -3.09150692215139E-15 7.083965749461133E-15 8.429694195516921E-13 3.974733794433277E-15 1.950862875101853E-13 1.521671655592102E-15
tp -3.588283982873899E-13 8.429694195516921E-13 7.020464156499989E-10 -3.409190971006183E-12 2.140472347155624E-10 2.611290068019065E-13
node -1.860754985063832E-15 3.974733794433277E-15 -3.409190971006183E-12 3.993636761008538E-9 -3.987795545086212E-9 5.071348714317026E-11
peri -8.319850305888699E-14 1.950862875101853E-13 2.140472347155624E-10 -3.987795545086212E-9 4.054237047406262E-9 -5.056346700167003E-11
i -6.474423469005423E-16 1.521671655592102E-15 2.611290068019065E-13 5.071348714317026E-11 -5.056346700167003E-11 2.196949936791852E-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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