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21499 Perillat (1998 KS4)
Classification: Main-belt Asteroid          SPK-ID: 2021499
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1232980035103221 3.5497e-08  
a 2.445582097090574 8.3146e-09 au
q 2.144046707098719 8.8315e-08 au
i 7.996378894213643 3.2086e-06 deg
node 78.97980330424215 2.8441e-05 deg
peri 295.6475651414894 3.1709e-05 deg
M 200.6189763771569 1.4562e-05 deg
tp 2459818.951870761309
(2022-Aug-27.45187076)
5.7362e-05 TDB
period 1396.92084046925
3.82
7.124e-06
1.95e-08
d
yr
n .2577096636907999 1.3143e-09 deg/d
Q 2.747117487082428 9.3398e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2760  
   data-arc span      10244 days (28.05 yr)  
   first obs. used      1993-01-25  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41404  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:46:28  

Additional Information
 Earth MOID = 1.15873 au 
 Jupiter MOID = 2.73297 au 
 T_jup = 3.475 
[ 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 14.2   n/a MPO459014  
diameter diameter 4.185 km 0.271 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 300.006 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.253   0.085 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21499 Perillat           Discovered 1998 May 22 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Phil Perillat (b. 1952), senior software specialist at the Arecibo Observatory, has written the primary data-acquisition programs for radar observations of minor planets and other solar system targets during the past several decades.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20080718/MPCPages.arcLast Updated: 2008-07-18

Alternate Designations
 1998 KS4 = 1999 SY10 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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