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 ]  
21875 (1999 UD6)
Classification: Main-belt Asteroid          SPK-ID: 2021875
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 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .130228826916163 2.8615e-08  
a 2.893133854536258 1.3212e-08 au
q 2.516364426548564 8.2151e-08 au
i 9.351737269167124 6.1602e-07 deg
node 51.8501803925251 5.8828e-06 deg
peri 357.4124816233631 6.7284e-06 deg
M 105.4522332583446 5.6926e-06 deg
tp 2458673.992576774855
(2019-Jul-09.49257677)
2.586e-05 TDB
period 1797.426820698018
4.92
1.2312e-05
3.371e-08
d
yr
n .2002863181156919 1.372e-09 deg/d
Q 3.269903282523952 1.4933e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1885  
   data-arc span      9604 days (26.29 yr)  
   first obs. used      1994-11-28  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46852  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:54:29  

Additional Information
 Earth MOID = 1.52593 au 
 Jupiter MOID = 2.11318 au 
 T_jup = 3.257 
[ 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 13.39   n/a E2021B10  
diameter diameter 9.481 km 0.127 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 11.5388 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.078   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21875 (1999 UD6)          Discovered 1999-Oct-22 by Beijing Schmidt CCD Asteroid Program at Xinglong
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 UD6 = 1994 XR5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Apr-16 12:37 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin