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21766 (1999 RW208)
Classification: Main-belt Asteroid          SPK-ID: 2021766
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 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2172172674733422 1.4109e-08  
a 2.712330405904337 9.6168e-09 au
q 2.123165406648936 4.0719e-08 au
i 6.473805292300224 1.3509e-06 deg
node 233.4891619936697 6.4166e-06 deg
peri 178.1357795681098 7.5961e-06 deg
M 289.0068271075573 5.9969e-06 deg
tp 2459718.255812692213
(2022-May-18.75581269)
2.8051e-05 TDB
period 1631.594811865734
4.47
8.6775e-06
2.376e-08
d
yr
n .2206430158896736 1.1735e-09 deg/d
Q 3.301495405159738 1.1706e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2444  
   data-arc span      29172 days (79.87 yr)  
   first obs. used      1941-09-25  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4477  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:45:17  

Additional Information
 Earth MOID = 1.13362 au 
 Jupiter MOID = 2.07971 au 
 T_jup = 3.319 
[ 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 12.84   n/a MPO636390  
diameter diameter 18.031 km 0.299 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 5.841 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Salvaggio, F.; Banfi, M.; Marchini, A.; Papini, R. (2018) Minor Planet Bull. 45, 171-173.]
[Zeigler, K.; Barnhard, T.; Moser, A.; Duval, N.; et al. (2018) Minor Planet Bull. 45, 184-186.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.040   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21766 (1999 RW208)          Discovered 1999-Sep-08 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 RW208 = 1941 SX = 1950 TZ3 = 1968 UW1 = 1986 TH6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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