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21762 (1999 RD201)
Classification: Main-belt Asteroid          SPK-ID: 2021762
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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06954219557623258 3.6279e-08  
a 2.557015460346956 1.191e-08 au
q 2.379194991112058 9.4352e-08 au
i 14.29362229104292 4.5522e-06 deg
node 302.9469371781595 1.5467e-05 deg
peri 282.3435344631417 4.004e-05 deg
M 201.4548708106395 3.9257e-05 deg
tp 2459858.231832583289
(2022-Oct-05.73183258)
0.00016371 TDB
period 1493.476721364165
4.09
1.0434e-05
2.857e-08
d
yr
n .241048283411589 1.6841e-09 deg/d
Q 2.734835929581854 1.2738e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1408  
   data-arc span      10260 days (28.09 yr)  
   first obs. used      1993-01-21  
   last obs. used      2021-02-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47657  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:52:47  

Additional Information
 Earth MOID = 1.4119 au 
 Jupiter MOID = 2.43388 au 
 T_jup = 3.390 
[ 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 14.34   n/a E2021B10  
diameter diameter 3.883 km 0.220 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.294   0.030 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21762 (1999 RD201)          Discovered 1999-Sep-08 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 RD201 = 1978 NH4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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