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 ]  
21909 (1999 VR21)
Classification: Main-belt Asteroid          SPK-ID: 2021909
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1330250261479198 6.7332e-08  
a 2.555109639669434 9.1922e-09 au
q 2.215216113041606 1.765e-07 au
i 6.414644943897129 4.1961e-06 deg
node 194.754828350571 2.837e-05 deg
peri 329.2767550028989 3.0914e-05 deg
M 320.7183521942443 1.1154e-05 deg
tp 2459363.279583993580
(2021-May-28.77958399)
4.6383e-05 TDB
period 1491.807332713334
4.08
8.0504e-06
2.204e-08
d
yr
n .241318025528956 1.3022e-09 deg/d
Q 2.895003166297263 1.0415e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1800  
   data-arc span      9249 days (25.32 yr)  
   first obs. used      1995-11-16  
   last obs. used      2021-03-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49061  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:54:59  

Additional Information
 Earth MOID = 1.22471 au 
 Jupiter MOID = 2.08922 au 
 T_jup = 3.417 
[ 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 14.62   n/a E2021B10  
diameter diameter 4.429 km 0.298 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.143   0.046 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21909 (1999 VR21)          Discovered 1999-Nov-12 by Korlevic, K. at Visnjan
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 VR21 = 1995 WU13 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Apr-20 11:08 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin