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 ]  
49390 (1998 XO21)
Classification: Main-belt Asteroid          SPK-ID: 2049390
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09856890520618061 3.7602e-08  
a 2.894501294329459 1.7684e-08 au
q 2.609193470629531 1.1552e-07 au
i 4.826403056990039 4.0286e-06 deg
node 287.5744602347353 5.3145e-05 deg
peri 51.7067191153459 5.7942e-05 deg
M 250.812382649724 2.3864e-05 deg
tp 2459546.044193033270
(2021-Nov-27.54419303)
0.0001203 TDB
period 1798.7013020161
4.92
1.6484e-05
4.513e-08
d
yr
n .2001444039632866 1.8342e-09 deg/d
Q 3.179809118029387 1.9427e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1066  
   data-arc span      9664 days (26.46 yr)  
   first obs. used      1994-01-07  
   last obs. used      2020-06-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57266  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 23:32:54  

Additional Information
 Earth MOID = 1.6034 au 
 Jupiter MOID = 2.1604 au 
 T_jup = 3.277 
[ 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 14.7   n/a MPO337652  

49390 (1998 XO21)          Discovered 1998-Dec-10 by Spacewatch at Kitt Peak
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 XO21 = 2000 GO154 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Nov-29 08:52 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin