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21666 (1999 RW1)
Classification: Main-belt Asteroid          SPK-ID: 2021666
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 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2232859669766714 4.2834e-08  
a 2.691615356944999 1.1105e-08 au
q 2.090615419240276 1.1542e-07 au
i 1.947842265160663 4.6393e-06 deg
node 6.05162001562343 0.00011527 deg
peri 4.905021676217455 0.00011563 deg
M 283.3155590590652 1.1935e-05 deg
tp 2459544.075888358886
(2021-Nov-25.57588836)
5.4818e-05 TDB
period 1612.938925961102
4.42
9.9817e-06
2.733e-08
d
yr
n .2231950597791461 1.3812e-09 deg/d
Q 3.292615294649721 1.3584e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1244  
   data-arc span      10872 days (29.77 yr)  
   first obs. used      1990-09-15  
   last obs. used      2020-06-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51119  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:55:37  

Additional Information
 Earth MOID = 1.08904 au 
 Jupiter MOID = 2.17388 au 
 T_jup = 3.334 
[ 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 14.62   n/a E2021B10  
diameter diameter 7.283 km 0.280 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 7.493 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.040   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21666 (1999 RW1)          Discovered 1999-Sep-05 by Korlevic, K. at Visnjan
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1999 RW1 = 1990 RJ12 = 1993 FK76 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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