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JPL Small-Body Database Browser
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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1231110466845163 3.6228e-08  
a 2.445991122318931 8.6032e-09 au
q 2.144862595069213 9.0334e-08 au
i 7.996175710462556 3.3532e-06 deg
node 78.98377595620644 2.8749e-05 deg
peri 295.66301552523 3.2215e-05 deg
M 149.0611439897332 1.4732e-05 deg
tp 2458421.947611700553
(2018-Oct-30.44761170)
5.6704e-05 TDB
period 1397.271309028371
3.83
7.3719e-06
2.018e-08
d
yr
n .2576450240364095 1.3593e-09 deg/d
Q 2.74711964956865 9.6624e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2588  
   data-arc span      9872 days (27.03 yr)  
   first obs. used      1993-01-25  
   last obs. used      2020-02-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42235  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 23:25:41  

Additional Information
 Earth MOID = 1.16091 au 
 Jupiter MOID = 2.73172 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)  
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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