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21764 (1999 RY205)
Classification: Main-belt Asteroid          SPK-ID: 2021764
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1479304917209571 2.9636e-08  
a 2.604127800738583 1.1286e-08 au
q 2.21889789467111 8.0386e-08 au
i 12.99400197869165 5.1118e-06 deg
node 215.9750303143272 1.4927e-05 deg
peri 262.0025385319182 2.3832e-05 deg
M 280.9712107990717 1.9626e-05 deg
tp 2459537.457164709804
(2021-Nov-18.95716471)
8.4384e-05 TDB
period 1534.941639901834
4.20
9.9787e-06
2.732e-08
d
yr
n .2345366042861561 1.5247e-09 deg/d
Q 2.989357706806056 1.2956e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1796  
   data-arc span      14003 days (38.34 yr)  
   first obs. used      1982-11-04  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44862  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:52:48  

Additional Information
 Earth MOID = 1.27845 au 
 Jupiter MOID = 2.26563 au 
 T_jup = 3.362 
[ 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 13.94   n/a E2021B10  
diameter diameter 4.536 km 0.067 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.312   0.052 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21764 (1999 RY205)          Discovered 1999-Sep-08 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 RY205 = 1988 AU4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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