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21397 Leontovich (1998 FJ54)
Classification: Main-belt Asteroid          SPK-ID: 2021397
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1269141433437444 3.106e-08  
a 2.304520993806799 6.9541e-09 au
q 2.012044686060134 7.34e-08 au
i 6.855019444199696 3.7041e-06 deg
node 354.463579558941 2.8373e-05 deg
peri 39.50764995792957 3.2478e-05 deg
M 322.5147049404207 1.5913e-05 deg
tp 2459333.553977865654
(2021-Apr-29.05397787)
5.6728e-05 TDB
period 1277.819261006322
3.50
5.7839e-06
1.584e-08
d
yr
n .2817299840327098 1.2752e-09 deg/d
Q 2.596997301553463 7.8366e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1627  
   data-arc span      14475 days (39.63 yr)  
   first obs. used      1981-05-28  
   last obs. used      2021-01-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50392  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:52:23  

Additional Information
 Earth MOID = 1.02141 au 
 Jupiter MOID = 2.83917 au 
 T_jup = 3.569 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.99   n/a E2021B10  
diameter diameter 2.074 km 0.522 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 5.836 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.]
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
geometric albedo albedo 0.494   0.191 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21397 Leontovich           Discovered 1998 Mar. 20 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Alexander Leontovich (b. 1963), a 2003 Intel International Science and Engineering Fair Excellence in Teaching Award finalist, is a teacher at the Moscow State Educational Center of Creativity of the Young, Lyceum No. 1553, Moscow, Russia.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20041226/MPCPages.arcLast Updated: 2004-12-25

Alternate Designations
 1998 FJ54 = 1981 KK1 = 1982 UB8 = 2000 WL72 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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