+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 25 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1905043641317135 3.9208e-08   a 3.041303404069554 1.5459e-08 au q 2.461921832945668 1.2111e-07 au i 1.846090661550747 4.8975e-06 deg node 20.37072047542386 0.00013508 deg peri 79.82551731839965 0.000136 deg M 48.77293416584222 1.3177e-05 deg tp 2458938.039210079971 (2020-Mar-29.53921008) 7.0642e-05 TDB period 1937.260613641384 5.30 1.4771e-05 4.044e-08 d yr n .1858294116264119 1.4169e-09 deg/d Q 3.62068497519344 1.8404e-08 au   Orbit Determination Parameters    # obs. used (total)      1065      data-arc span      22029 days (60.31 yr)      first obs. used      1960-09-24      last obs. used      2021-01-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .5017      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 02:02:19   Additional Information  Earth MOID = 1.47944 au   Jupiter MOID = 1.55158 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 14.81   n/a E2021B10   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-Apr-12 13:50 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin