+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   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.arc Last Updated: 2006-03-22 Alternate Designations  1998 QT55 = 1994 LK3 = 1997 GR31  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-16 11:09 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin