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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2231597481220757 3.9184e-08  
a 2.69284720367536 9.3348e-09 au
q 2.091912099971931 1.0762e-07 au
i 1.948000873656269 4.2571e-06 deg
node 6.03402662428181 0.00010498 deg
peri 4.769465489980713 0.00010523 deg
M 327.1641669419877 8.2988e-06 deg
tp 2459543.718209838058
(2021-Nov-25.21820984)
3.7526e-05 TDB
period 1614.046320922211
4.42
8.3927e-06
2.298e-08
d
yr
n .2230419259555749 1.1598e-09 deg/d
Q 3.293782307378789 1.1418e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1349  
   data-arc span      11285 days (30.90 yr)  
   first obs. used      1990-09-15  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50951  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:44:56  

Additional Information
 Earth MOID = 1.09097 au 
 Jupiter MOID = 2.17341 au 
 T_jup = 3.334 
[ 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 14.64   n/a MPO636389  
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

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