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21212 (1994 PG39)
Classification: Main-belt Asteroid          SPK-ID: 2021212
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1429714880090913 3.5529e-08  
a 3.135352269197215 1.9825e-08 au
q 2.687086289837408 1.1396e-07 au
i .6341846994725856 5.1704e-06 deg
node 219.660599202645 0.00042409 deg
peri 37.66410645143719 0.00042456 deg
M 324.5606602062055 2.0671e-05 deg
tp 2459400.123222804201
(2021-Jul-04.62322280)
0.00011664 TDB
period 2027.813176759451
5.55
1.9233e-05
5.266e-08
d
yr
n .1775311474084108 1.6838e-09 deg/d
Q 3.583618248557022 2.266e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1028  
   data-arc span      10599 days (29.02 yr)  
   first obs. used      1992-02-05  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .58162  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:41:32  

Additional Information
 Earth MOID = 1.67041 au 
 Jupiter MOID = 1.47146 au 
 T_jup = 3.196 
[ 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 14.45   n/a E2021B10  
diameter diameter 5.688 km 0.999 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.36 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:
[Chang, C.K.; Ip, W.-H.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.]
geometric albedo albedo 0.066   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21212 (1994 PG39)          Discovered 1994-Aug-10 by Elst, E. W. at La Silla
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1994 PG39 = 1998 FL129 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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