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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 | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2178768530743519 1.4118e-08  
a 2.710757179640696 9.8634e-09 au
q 2.120145935891875 4.0619e-08 au
i 6.478379262605994 1.3706e-06 deg
node 233.5700837026458 6.4252e-06 deg
peri 178.2068689594423 7.6787e-06 deg
M 245.6461488247368 6.1676e-06 deg
tp 2459718.324561874197
(2022-May-18.82456187)
2.943e-05 TDB
period 1630.175462905934
4.46
8.8974e-06
2.436e-08
d
yr
n .2208351236978305 1.2053e-09 deg/d
Q 3.301368423389516 1.2012e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2237  
   data-arc span      28869 days (79.04 yr)  
   first obs. used      1941-09-25  
   last obs. used      2020-10-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45585  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 03:04:12  

Additional Information
 Earth MOID = 1.1303 au 
 Jupiter MOID = 2.07836 au 
 T_jup = 3.319 
[ 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 12.82   n/a E2021B10  
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

[ show close-approach data ]
Alternate Designations
 1999 RW208 = 1941 SX = 1950 TZ3 = 1968 UW1 = 1986 TH6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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