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21690 (1999 RA39)
Classification: Main-belt Asteroid          SPK-ID: 2021690
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .244360897511789 1.2703e-08  
a 2.339022664540949 8.3729e-09 au
q 1.767456986933307 3.0117e-08 au
i 24.79421696050832 7.9497e-07 deg
node 149.0409545272682 2.1909e-06 deg
peri 318.6615600796489 4.5478e-06 deg
M 307.9889698325208 4.9166e-06 deg
tp 2459585.274368867668
(2022-Jan-05.77436887)
1.8729e-05 TDB
period 1306.622317872353
3.58
7.0159e-06
1.921e-08
d
yr
n .2755195553265984 1.4794e-09 deg/d
Q 2.910588342148592 1.0419e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2075  
   data-arc span      11248 days (30.80 yr)  
   first obs. used      1990-02-20  
   last obs. used      2020-12-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43056  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:51:43  

Additional Information
 Earth MOID = .82923 au 
 Jupiter MOID = 2.28773 au 
 T_jup = 3.405 
[ 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 13.75   n/a E2021B10  
diameter diameter 4.870 km 0.056 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.179   0.032 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21690 (1999 RA39)          Discovered 1999-Sep-13 by Broughton, J. at Reedy Creek
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 RA39 = 1990 DP9 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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