+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   1777 Gehrels (4007 P-L) Classification: Main-belt Asteroid          SPK-ID: 2001777 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 1 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .01788644242632652 5.0507e-08   a 2.625872735110769 1.0479e-08 AU q 2.57890521361535 1.3485e-07 AU i 3.14782666765205 6.0162e-06 deg node 334.7088626167289 9.1592e-05 deg peri 128.952345585175 0.00022103 deg M 29.19202014483022 0.0001962 deg tp 2456274.470971950408 (2012-Dec-12.97097195) 0.00084711 JED period 1554.20727557589 4.26 9.3032e-06 2.547e-08 d yr n .23162933648384 1.3865e-09 deg/d Q 2.672840256606188 1.0666e-08 AU   Orbit Determination Parameters    # obs. used (total)      1490      data-arc span      39246 days (107.45 yr)      first obs. used      1905-11-03      last obs. used      2013-04-16      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .52588      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 12:47:23   Additional Information  Earth MOID = 1.59651 AU   T_jup = 3.400  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 11.1 mag n/a PDS3 (MPC 17263)   rotation period rot_per 2.83552 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Published Reference List: [Pravec, P.; Wolf, M.; Sarounova, L. (1990) http://www.asu.cas.cz/~ppravec/neo.htm] [Wisniewski, W.Z.; Michalowski, T.M.; Harris, A.W.; McMillan, R.S. (1997) Icarus 126, 395-449; 1995, Lunar & Planetary Science XXVI, 1511-1512.] [Stephens, R.D. (2005) Minor Planet Bul. 32, 66-68.] [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Pravec, P.; Wolf, M.; Sarounova, L. (2005) http://www.asu.cas.cz/~ppravec/neo.htm] [Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] SMASSII spectral type spec_B Sq   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 1777 Gehrels (4007 P-L)          Discovered 1960-Sep-24 by PLS at Palomar (675) These planets have all been discovered as a result of the Palomar survey of faint minor planets and subsequently identified with planets observed at other oppositions. In Sept. and Oct. 1960, T. Gehrels exposed 130 plates with the 122 cm Schmidt camera at Palomar. In the following years C. J. van Houten and I. van Houten-Groeneveld measured these plates astrometrically and photometrically at Leiden. P. Herget, Cincinnati, computed the orbits of the planets found on the NORC computer, Dahlgren, Virginia, USA. Note: "planet" implies "minor planet" Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  4007 P-L = 1937 GN = 1941 BU = 1951 QB = 1958 DA = A905 UE = A923 AA  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-19 13:35 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin