+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   2340 Hathor (1976 UA) Classification: Aten [NEO, PHA]          SPK-ID: 2002340 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 46 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .4498427208488246 1.7033e-07   a .8442304480874677 4.3174e-10 AU q .4644595262963788 1.4367e-07 AU i 5.854267230354686 9.2568e-06 deg node 211.4663976004391 2.9065e-05 deg peri 40.01184820207784 2.9793e-05 deg M 113.4940812056478 4.4848e-05 deg tp 2456311.177543856885 (2013-Jan-18.67754386) 3.5272e-05 JED period 283.3282922768082 0.78 2.1734e-07 5.95e-10 d yr n 1.270610841956738 9.7468e-10 deg/d Q 1.224001369878557 6.2595e-10 AU   Orbit Determination Parameters    # obs. used (total)      183      data-arc span      12884 days (35.27 yr)      first obs. used      1976-10-25      last obs. used      2012-02-03      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .70981      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 15:37:32   Additional Information  Earth MOID = .00691096 AU   T_jup = 6.879  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 19.2 mag n/a PDS3 (MPC 28108)   diameter diameter 0.3 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543 based on assumed medium albedo (0.15) B-V BV .770 mag .020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=1; phase=32.11 deg. U-B UB .500 mag .042 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=1; phase=32.11 deg. Tholen spectral type spec_T CSU   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices 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) 2340 Hathor           Discovered 1976 Oct. 22 by C. Kowal at Palomar. Like the other objects of Aten type, (2340) is named for an Egyptian deity. Known as a sky-goddess and the daughter of Ra, Hathor was also identified with Aphrodite. Name proposed by E. Helin, who made an independent discovery of the object and who also made crucial recovery observations in 1981. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: MPC 6060 Last Updated: 2006-03-21 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-26 02:28 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin