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305290 (2008 AT4)
Classification: Main-belt Asteroid          SPK-ID: 2305290
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2598677764115147 5.4902e-08  
a 2.62157493811368 3.0662e-08 au
q 1.940312088249924 1.5687e-07 au
i 6.870089096869522 9.5939e-06 deg
node 51.82929228843818 6.0048e-05 deg
peri 47.46499861783464 6.7691e-05 deg
M 340.220209924745 3.4725e-05 deg
tp 2459085.684586396752
(2020-Aug-24.18458640)
0.00015081 TDB
period 1550.393153120227
4.24
2.72e-05
7.447e-08
d
yr
n .2321991678533189 4.0737e-09 deg/d
Q 3.302837787977436 3.863e-08 au
  Orbit Determination Parameters
   # obs. used (total)      147  
   data-arc span      7675 days (21.01 yr)  
   first obs. used      1998-09-19  
   last obs. used      2019-09-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56059  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-08 07:39:45  

Additional Information
 Earth MOID = .96463 au 
 Jupiter MOID = 1.92178 au 
 T_jup = 3.346 
[ 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 17.2   n/a MPO494622  

305290 (2008 AT4)          Discovered 2008-Jan-05 by PMO NEO Survey Program at Purple Mountain
Reference: 20111110/Numbers.arcLast Updated: 2011-11-14

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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