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20741 Jeanmichelreess (1999 XA230)
Classification: Main-belt Asteroid          SPK-ID: 2020741
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2620785551724008 4.8369e-08  
a 3.181331794718449 2.0892e-08 au
q 2.347572954434617 1.5759e-07 au
i 12.36219887281119 5.5059e-06 deg
node 303.9730055532471 1.9879e-05 deg
peri 200.7185167126412 2.1114e-05 deg
M 200.695004792103 7.7851e-06 deg
tp 2460313.646617763647
(2024-Jan-04.14661776)
4.7861e-05 TDB
period 2072.582733291128
5.67
2.0416e-05
5.59e-08
d
yr
n .1736963230550238 1.711e-09 deg/d
Q 4.015090635002281 2.6367e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1496  
   data-arc span      13649 days (37.37 yr)  
   first obs. used      1984-01-26  
   last obs. used      2021-06-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43289  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:26:34  

Additional Information
 Earth MOID = 1.36545 au 
 Jupiter MOID = 1.0885 au 
 T_jup = 3.110 
[ 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 13.21   n/a E2021B10  
diameter diameter 14.210 km 0.242 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 49.7215 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 0.042   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20741 Jeanmichelreess           Discovered 1999 Dec. 7 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Jean-Michel Reess (b. 1967) is an engineer at Paris Observatory. He is developing the optics of new-generation instruments for space missions.
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

[ show close-approach data ]
Alternate Designations
 1999 XA230 = 1984 BH 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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