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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1433490530231428 3.4332e-08  
a 2.746368616978168 1.0701e-08 au
q 2.35267927648187 9.6211e-08 au
i 9.321440236004099 3.8396e-06 deg
node 176.6648129325372 1.9775e-05 deg
peri 349.0702924249777 2.284e-05 deg
M 38.09211091338211 1.1278e-05 deg
tp 2459024.598635698115
(2020-Jun-24.09863570)
5.189e-05 TDB
period 1662.404356972304
4.55
9.7164e-06
2.66e-08
d
yr
n .2165538116464391 1.2657e-09 deg/d
Q 3.140057957474468 1.2235e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2006  
   data-arc span      15857 days (43.41 yr)  
   first obs. used      1977-10-07  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47165  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:26:00  

Additional Information
 Earth MOID = 1.35993 au 
 Jupiter MOID = 1.8341 au 
 T_jup = 3.314 
[ 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 13.98   n/a E2021B10  
rotation period rot_per 16.658 h n/a LCDB (Rev. 2020-October); 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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