Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .117341515908815 4.3567e-08  
a 3.104825155588949 1.9125e-08 au
q 2.740500265200319 1.3241e-07 au
i .7304241432299454 4.7152e-06 deg
node 168.9935752764606 0.00026896 deg
peri 11.38622351329393 0.00026949 deg
M 200.0073023802661 1.9657e-05 deg
tp 2460088.579427794757
(2023-May-24.07942780)
0.00011408 TDB
period 1998.269913330586
5.47
1.8463e-05
5.055e-08
d
yr
n .180155842610859 1.6646e-09 deg/d
Q 3.469150045977578 2.1369e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1241  
   data-arc span      9471 days (25.93 yr)  
   first obs. used      1995-01-07  
   last obs. used      2020-12-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52633  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:55:27  

Additional Information
 Earth MOID = 1.74314 au 
 Jupiter MOID = 1.49023 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Apr-10 20:10 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin