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 ]  
66957 (1999 XO21)
Classification: Main-belt Asteroid          SPK-ID: 2066957
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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .146303421786178 5.2513e-08  
a 2.742578505571778 1.5068e-08 au
q 2.341329885689404 1.4192e-07 au
i 6.610196416368139 5.1957e-06 deg
node 165.0401745579019 4.0032e-05 deg
peri 200.1425645233538 4.2134e-05 deg
M 270.5779864334778 1.4582e-05 deg
tp 2459612.577567262044
(2022-Feb-02.07756726)
6.8884e-05 TDB
period 1658.964256088662
4.54
1.3672e-05
3.743e-08
d
yr
n .2170028671074394 1.7884e-09 deg/d
Q 3.143827125454151 1.7273e-08 au
  Orbit Determination Parameters
   # obs. used (total)      747  
   data-arc span      7547 days (20.66 yr)  
   first obs. used      1999-10-10  
   last obs. used      2020-06-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5049  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 12:26:16  

Additional Information
 Earth MOID = 1.33876 au 
 Jupiter MOID = 2.31454 au 
 T_jup = 3.324 
[ 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 15.17   n/a E2021B10  

66957 (1999 XO21)          Discovered 1999-Dec-05 by LINEAR at Socorro
Reference: 20030910/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 XO21 = 2001 DT53 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Jun-15 17:19 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin