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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 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2172172669028819 1.4132e-08  
a 2.712330406579256 9.9014e-09 au
q 2.123165408724528 4.0742e-08 au
i 6.473805048364569 1.3629e-06 deg
node 233.4891619928351 6.4243e-06 deg
peri 178.1357798150064 7.6532e-06 deg
M 289.0068266293461 6.1837e-06 deg
tp 2459718.255814979661
(2022-May-18.75581498)
2.8974e-05 TDB
period 1631.594812474727
4.47
8.9342e-06
2.446e-08
d
yr
n .2206430158073184 1.2082e-09 deg/d
Q 3.301495404433984 1.2052e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2360  
   data-arc span      29128 days (79.75 yr)  
   first obs. used      1941-09-25  
   last obs. used      2021-06-25  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45283  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 05:10:53  

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 12.83   n/a MPO614063  
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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