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21553 Monchicourt (1998 QT55)
Classification: Main-belt Asteroid          SPK-ID: 2021553
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1654808224659609 3.1212e-08  
a 2.22525615533952 7.0557e-09 au
q 1.857018936556494 7.1408e-08 au
i 2.082005754854619 3.5307e-06 deg
node 40.88794641443632 0.00010219 deg
peri 245.7054907722447 0.0001029 deg
M 331.1198441248414 1.4265e-05 deg
tp 2459297.766989787046
(2021-Mar-24.26698979)
4.8276e-05 TDB
period 1212.462857704162
3.32
5.7666e-06
1.579e-08
d
yr
n .2969163118791712 1.4122e-09 deg/d
Q 2.593493374122546 8.2233e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1354  
   data-arc span      10556 days (28.90 yr)  
   first obs. used      1991-07-17  
   last obs. used      2020-06-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51721  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:47:59  

Additional Information
 Earth MOID = .839912 au 
 Jupiter MOID = 2.55656 au 
 T_jup = 3.627 
[ 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 15.23   n/a E2021B10  
diameter diameter 2.447 km 0.357 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.204   0.086 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21553 Monchicourt           Discovered 1998 Aug. 26 by the OCA-DLR Asteroid Survey at Caussols.
Marie Odile Monchicourt (b. 1947) is a well-known French science journalist, producer and host on Radio-France and France television. Since her poussières d´étoiles (star dust) program (1984-1987), she has participated regularly in many programs on French radio and TV.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20051215/MPCPages.arcLast Updated: 2006-03-22

Alternate Designations
 1998 QT55 = 1994 LK3 = 1997 GR31 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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