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21745 Shadfan (1999 RX168)
Classification: Main-belt Asteroid          SPK-ID: 2021745
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06692543937531537 3.6217e-08  
a 2.61025558177309 1.1584e-08 au
q 2.435563080081056 9.7421e-08 au
i 4.427387496719422 5.018e-06 deg
node 334.7234815293864 4.1193e-05 deg
peri 133.4887281760327 5.5337e-05 deg
M 262.6910100650377 3.702e-05 deg
tp 2459616.864257195094
(2022-Feb-06.36425720)
0.00015916 TDB
period 1540.362639571284
4.22
1.0254e-05
2.807e-08
d
yr
n .2337111993966536 1.5558e-09 deg/d
Q 2.784948083465123 1.236e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1381  
   data-arc span      10185 days (27.89 yr)  
   first obs. used      1993-03-20  
   last obs. used      2021-02-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52608  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:52:33  

Additional Information
 Earth MOID = 1.45463 au 
 Jupiter MOID = 2.27877 au 
 T_jup = 3.403 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457500.5 (2016-Apr-22.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06647219206575372 3.5313e-08  
q 2.437912518438968 9.5017e-08 au
tp 2458066.552007968833
(2017-Nov-09.05200797)
0.00015975 TDB
node 334.8906148437476 4.1257e-05 deg
peri 131.3159566903912 5.5892e-05 deg
i 4.423204280460223 5.0142e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1381  
   data-arc span      10185 days (27.89 yr)  
   first obs. used      1993-03-20  
   last obs. used      2021-02-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52608  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:52:33  

Additional Information
 Jupiter MOID = 2.27877 au 
 T_jup = 3.403 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.24699870954741E-15 -3.334307761694249E-15 2.049089979938605E-12 -1.109719820186682E-14 5.321734544902919E-13 -2.412058848779058E-16
q -3.334307761694249E-15 9.028302922793418E-15 -4.921470854267459E-12 2.832715538815107E-14 -1.302541088950746E-12 7.645164894387413E-16
tp 2.049089979938605E-12 -4.921470854267459E-12 2.552079958858002E-8 -7.090851755620737E-11 6.025558585149229E-9 -9.180822875880333E-13
node -1.109719820186682E-14 2.832715538815107E-14 -7.090851755620737E-11 1.702106821802387E-9 -1.713408821966619E-9 4.676159734847682E-11
peri 5.321734544902919E-13 -1.302541088950746E-12 6.025558585149229E-9 -1.713408821966619E-9 3.123864873487104E-9 -4.689068607344302E-11
i -2.412058848779058E-16 7.645164894387413E-16 -9.180822875880333E-13 4.676159734847682E-11 -4.689068607344302E-11 2.514251912940238E-11

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 14.79   n/a E2021B10  
diameter diameter 3.462 km 0.254 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 2.77 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:
[Chang, C.K.; Ip, W.-H.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.]
geometric albedo albedo 0.256   0.059 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21745 Shadfan           Discovered 1999 Sept. 9 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Basil Harbi Shadfan (b. 1987) was awarded second place in the 2005 Intel International Science and Engineering Fair for his botany team project. He attends the Keystone School, San Antonio, Texas, U.S.A.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050822/MPCPages.arcLast Updated: 2005-08-26

[ show close-approach data ]
Alternate Designations
 1999 RX168 = 1996 AN3 = 1997 EF36 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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