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18279 (4221 T-3)
Classification: Main-belt Asteroid          SPK-ID: 2018279
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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1435235059594478 3.5063e-08  
a 2.746926049727088 1.0874e-08 au
q 2.35267759245892 9.8493e-08 au
i 9.320749280253786 3.8753e-06 deg
node 176.6646975362083 1.992e-05 deg
peri 349.0870297131258 2.2967e-05 deg
M 354.7695195908598 1.1281e-05 deg
tp 2459024.660613487604
(2020-Jun-24.16061349)
5.2138e-05 TDB
period 1662.910512070379
4.55
9.8745e-06
2.703e-08
d
yr
n .2164878972060787 1.2855e-09 deg/d
Q 3.141174506995256 1.2435e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1935  
   data-arc span      15545 days (42.56 yr)  
   first obs. used      1977-10-07  
   last obs. used      2020-04-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46877  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 04:47:16  

Additional Information
 Earth MOID = 1.36024 au 
 Jupiter MOID = 1.83393 au 
 T_jup = 3.313 
[ 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 13.9   n/a MPO421794  
rotation period rot_per 16.658 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

18279 (4221 T-3)          Discovered 1977-Oct-16 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar
Reference: 20001013/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 4221 T-3 = 1998 HX125 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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