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 ]  
21771 (1999 RQ211)
Classification: Main-belt Asteroid          SPK-ID: 2021771
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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .211330068455738 5.8464e-08  
a 2.733293474270257 1.4594e-08 au
q 2.155666377243102 1.6255e-07 au
i 9.99291650092783 5.9166e-06 deg
node 331.1991990201768 2.794e-05 deg
peri 42.81512509331915 2.9687e-05 deg
M 250.697440620314 1.1466e-05 deg
tp 2459701.636059952458
(2022-May-02.13605995)
5.4752e-05 TDB
period 1650.54672650615
4.52
1.3219e-05
3.619e-08
d
yr
n .2181095477145576 1.7468e-09 deg/d
Q 3.310920571297412 1.7678e-08 au
  Orbit Determination Parameters
   # obs. used (total)      894  
   data-arc span      23898 days (65.43 yr)  
   first obs. used      1954-12-21  
   last obs. used      2020-05-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48649  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:53:01  

Additional Information
 Earth MOID = 1.1656 au 
 Jupiter MOID = 2.21751 au 
 T_jup = 3.299 
[ 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 14.71   n/a E2021B10  
diameter diameter 7.297 km 0.396 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.058   0.016 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21771 (1999 RQ211)          Discovered 1999-Sep-08 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Apr-20 11:34 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin