+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   5644 Maureenbell (1990 QG2) Classification: Main-belt Asteroid          SPK-ID: 2005644 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 35 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1115813099337598 3.2507e-08   a 3.125218438775442 1.5801e-08 au q 2.776502471547739 1.008e-07 au i 14.33059276722071 3.9063e-06 deg node 165.9838540598869 1.4762e-05 deg peri 263.1584954869187 2.3759e-05 deg M 64.80751274028108 1.7627e-05 deg tp 2458637.219700468547 (2019-Jun-02.71970047) 9.9028e-05 TDB period 2017.989925881485 5.52 1.5304e-05 4.19e-08 d yr n .1783953405231927 1.3529e-09 deg/d Q 3.473934406003146 1.7564e-08 au   Orbit Determination Parameters    # obs. used (total)      2448      data-arc span      25101 days (68.72 yr)      first obs. used      1951-08-08      last obs. used      2020-04-28      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .46147      source      ORB      producer      Otto Matic      solution date      2020-May-20 02:24:04   Additional Information  Earth MOID = 1.83598 au   Jupiter MOID = 1.90183 au   T_jup = 3.157  [ 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 12.1   n/a MPO337301   diameter diameter 15.926 km 0.213 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.090   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   5644 Maureenbell           Discovered 1990 Aug. 22 by H. E. Holt at Palomar. Maureen E. Ockert-Bell (b. 1961), an image-processing specialist at Cornell University, has published results on the physical and optical properties of the Saturnian, Uranian and Jovian ring systems, on the physical and radiative properties of dust in Mars' atmosphere, and on clouds in Earth's atmosphere. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 19990928/MPCPages.arc Last Updated: 2010-06-11 [ show close-approach data ] Alternate Designations  1990 QG2 = 1979 SZ12  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-21 02:50 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin