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 ]  
102912 (1999 XA21)
Classification: Main-belt Asteroid          SPK-ID: 2102912
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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2714326131927096 3.6351e-08  
a 2.286842130130741 8.1835e-09 au
q 1.666118594790172 8.3704e-08 au
i 22.54048139967729 6.8894e-06 deg
node 220.7736006215931 9.1836e-06 deg
peri 69.94427366612621 1.5662e-05 deg
M 107.6863913344352 1.5263e-05 deg
tp 2458822.657308199601
(2019-Dec-05.15730820)
5.2282e-05 TDB
period 1263.143535246751
3.46
6.7803e-06
1.856e-08
d
yr
n .2850032398967828 1.5298e-09 deg/d
Q 2.907565665471311 1.0405e-08 au
  Orbit Determination Parameters
   # obs. used (total)      970  
   data-arc span      9387 days (25.70 yr)  
   first obs. used      1995-05-05  
   last obs. used      2021-01-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50679  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 08:32:45  

Additional Information
 Earth MOID = .771088 au 
 Jupiter MOID = 2.46928 au 
 T_jup = 3.454 
[ 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 15.23   n/a E2021B55  
rotation period rot_per 41.6 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:
[Stephens, R.D. (2017) Minor Planet Bull. 44, 49-52.]

102912 (1999 XA21)          Discovered 1999-Dec-05 by LINEAR at Socorro
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

Alternate Designations
 1999 XA21 = 1995 JN1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Mar-04 20:09 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin