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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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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2620785466940615 4.7983e-08  
a 3.181331787913368 2.0136e-08 au
q 2.347572976385412 1.5684e-07 au
i 12.36219989312702 5.3811e-06 deg
node 303.9730018398212 1.937e-05 deg
peri 200.718524280362 2.0542e-05 deg
M 200.6950034382346 7.7345e-06 deg
tp 2460313.646622615347
(2024-Jan-04.14662262)
4.7773e-05 TDB
period 2072.582726641038
5.67
1.9677e-05
5.387e-08
d
yr
n .1736963236123459 1.6491e-09 deg/d
Q 4.015090599441323 2.5413e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1536  
   data-arc span      13708 days (37.53 yr)  
   first obs. used      1984-01-26  
   last obs. used      2021-08-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43253  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:36:16  

Additional Information
 Earth MOID = 1.36545 au 
 Jupiter MOID = 1.0885 au 
 T_jup = 3.110 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457169.5 (2015-May-27.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2524141907960152 4.557e-08  
q 2.386672363741534 1.4565e-07 au
tp 2456138.689804049925
(2012-Jul-30.18980405)
5.144e-05 TDB
node 304.2551510300664 1.9429e-05 deg
peri 199.1132870688702 2.0895e-05 deg
i 12.31585102650185 5.3533e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1536  
   data-arc span      13708 days (37.53 yr)  
   first obs. used      1984-01-26  
   last obs. used      2021-08-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43253  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:36:16  

Additional Information
 Jupiter MOID = 1.0885 au 
 T_jup = 3.110 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.076654794228319E-15 -6.610972542238328E-15 -3.597148459571933E-13 -1.333694287356196E-14 -1.445765972466569E-14 3.307143782910879E-15
q -6.610972542238328E-15 2.121427962061627E-14 9.040549722874795E-13 1.487679642513392E-14 3.737557383880624E-14 -3.450061954192862E-15
tp -3.597148459571933E-13 9.040549722874795E-13 2.646051452060907E-9 3.683086881874779E-11 3.932305908358572E-10 -1.088102243269747E-11
node -1.333694287356196E-14 1.487679642513392E-14 3.683086881874779E-11 3.774845778562777E-10 -3.676114800975225E-10 4.871605695548883E-12
peri -1.445765972466569E-14 3.737557383880624E-14 3.932305908358572E-10 -3.676114800975225E-10 4.365897816277827E-10 -5.25924198592346E-12
i 3.307143782910879E-15 -3.450061954192862E-15 -1.088102243269747E-11 4.871605695548883E-12 -5.25924198592346E-12 2.865815468768742E-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 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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