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18727 Peacock (1998 KW3)
Classification: Main-belt Asteroid          SPK-ID: 2018727
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1112722719705867 3.7049e-08  
a 3.133977325547063 1.596e-08 au
q 2.785252548229138 1.2183e-07 au
i 5.359343177215016 4.3913e-06 deg
node 179.5330226754837 3.6895e-05 deg
peri 74.87070070135641 4.1672e-05 deg
M 3.290733936326163 1.9125e-05 deg
tp 2459181.976098154715
(2020-Nov-28.47609815)
0.00010766 TDB
period 2026.479439947587
5.55
1.548e-05
4.238e-08
d
yr
n .1776479903538084 1.357e-09 deg/d
Q 3.482702102864988 1.7736e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1729  
   data-arc span      10799 days (29.57 yr)  
   first obs. used      1990-12-24  
   last obs. used      2020-07-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50736  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:35:56  

Additional Information
 Earth MOID = 1.7755 au 
 Jupiter MOID = 1.57175 au 
 T_jup = 3.196 
[ 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 13.51   n/a E2021B10  
diameter diameter 10.937 km 0.175 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.41997 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 0.071   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18727 Peacock           Discovered 1998 May 22 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Anthony Peacock (b. 1950) was project scientist for the ESA Exosat and XMM-Newton missions. A leading expert on detectors for use in high-energy astrophysics, he has also developed the S-CAM, a cryogenic camera having an ultrafast photon-counting detector, for groundbased optical astronomy.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20070926/MPCPages.arcLast Updated: 2007-09-30

[ show close-approach data ]
Alternate Designations
 1998 KW3 = 1994 TW4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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