+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   11761 Davidgill (4868 P-L) Classification: Main-belt Asteroid          SPK-ID: 2011761 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 28 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1905007323838945 3.4001e-08   a 3.040598865518956 1.3987e-08 au q 2.461362554751956 1.0235e-07 au i 1.846209128381302 4.7883e-06 deg node 20.37005759232035 0.00010941 deg peri 79.75676317147561 0.00011052 deg M 85.26726487961754 1.3215e-05 deg tp 2458937.812450275182 (2020-Mar-29.31245028) 7.0559e-05 TDB period 1936.587483298142 5.30 1.3363e-05 3.659e-08 d yr n .1858940032943388 1.2827e-09 deg/d Q 3.619835176285956 1.6651e-08 au   Orbit Determination Parameters    # obs. used (total)      1198      data-arc span      22173 days (60.71 yr)      first obs. used      1960-09-24      last obs. used      2021-06-09      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .49736      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 16:38:18   Additional Information  Earth MOID = 1.47927 au   Jupiter MOID = 1.553 au   T_jup = 3.211  [ 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 14.82   n/a MPCxxxxx   diameter diameter 6.856 km 0.199 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.050   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   11761 Davidgill           Discovered 1960 Sept. 24 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels. David Gill (1843-1914) was a British astronomer and instrument designer who directed the observatory at the Cape of Good Hope and carried out all the observations to measure distances to the stars in terms of the standard meter. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20070926/MPCPages.arc Last Updated: 2007-09-30 [ show close-approach data ] Alternate Designations  4868 P-L = 1962 CE1 = 1997 TT11 = 1998 XT48 = 1999 BG21  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jul-25 13:22 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin