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21985 Sejna (1999 XG15)
Classification: Main-belt Asteroid          SPK-ID: 2021985
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1173474995503538 4.357e-08  
a 3.105080524385496 1.9051e-08 au
q 2.740707088946356 1.3249e-07 au
i .7303727939222951 4.712e-06 deg
node 168.9900067046073 0.00026878 deg
peri 11.31414426666285 0.0002693 deg
M 235.4078642000715 1.9843e-05 deg
tp 2460088.165092177783
(2023-May-23.66509218)
0.00011406 TDB
period 1998.516451984161
5.47
1.8393e-05
5.036e-08
d
yr
n .1801336184361084 1.6578e-09 deg/d
Q 3.469453959824635 2.1287e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1249  
   data-arc span      9532 days (26.10 yr)  
   first obs. used      1995-01-07  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52587  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:57:01  

Additional Information
 Earth MOID = 1.74466 au 
 Jupiter MOID = 1.48912 au 
 T_jup = 3.210 
[ 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 14.26   n/a E2021B10  

21985 Šejna           Discovered 1999 Dec. 2 by L. Šarounová at Ondřejov.
Karel Šejna (1896-1982) was the conductor of the Czech Philharmonic Orchestra during 1938-1972 and cocreator of the era of Talich and Ančerl. He was a significiant interpreter of Mahler, Wagner and Bruckner, and his recordings of the compositions of Smetana, Dvořák, Fibich and Suk are superb.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20020427/MPCPages.arcLast Updated: 2003-10-02

[ show close-approach data ]
Alternate Designations
 1999 XG15 = 1996 FY16 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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