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 ]  
21972 (1999 XU)
Classification: Main-belt Asteroid          SPK-ID: 2021972
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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .251526184193875 4.0626e-08  
a 2.612674994550763 1.0267e-08 au
q 1.955518822632657 1.0899e-07 au
i 6.646493552836442 3.2831e-06 deg
node 71.7085935305489 3.7597e-05 deg
peri 273.1367501773387 3.8387e-05 deg
M 16.91794504464218 6.1026e-06 deg
tp 2459128.011081707334
(2020-Oct-05.51108171)
2.6195e-05 TDB
period 1542.504749631173
4.22
9.0927e-06
2.489e-08
d
yr
n .233386639545894 1.3758e-09 deg/d
Q 3.269831166468869 1.285e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1476  
   data-arc span      9244 days (25.31 yr)  
   first obs. used      1995-10-23  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51263  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:56:39  

Additional Information
 Earth MOID = .960248 au 
 Jupiter MOID = 2.18785 au 
 T_jup = 3.354 
[ 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 14.61   n/a E2021B10  

21972 (1999 XU)          Discovered 1999-Dec-02 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1985-Jun-05 03:50 < 00:01 Juno 0.0327184654429133 0.0327162911353115 0.0327206399328134 6.84011203202438 6.84011197766308 2446221.659567358 0.378930731971121 185.161202856673 63.4203962996013 -59.6500604732357 67902.3022711164 T 29 CATAB v2.0f-lin.ifort 2021-Apr-13 03:56:55 2021-Apr-13 03:56

Alternate Designations
 1999 XU = 1995 UJ49 = 1996 CB9 = 1998 HT71 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-May-07 13:46 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin