+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   570 Kythera (1905 QX) Classification: Outer Main-belt Asteroid          SPK-ID: 2000570 [ 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 1 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1218248147453384 5.6305e-08   a 3.419501410529552 1.943e-08 AU q 3.002921284670366 1.9587e-07 AU i 1.786629247611363 6.3409e-06 deg node 223.9139345936079 0.0001725 deg peri 155.0825094742407 0.00017432 deg M 299.1156396177758 2.354e-05 deg tp 2456791.112246199926 (2014-May-13.61224620) 0.00015225 JED period 2309.63104070038 6.32 1.9685e-05 5.389e-08 d yr n .1558690516606637 1.3285e-09 deg/d Q 3.836081536388738 2.1797e-08 AU   Orbit Determination Parameters    # obs. used (total)      1544      data-arc span      39332 days (107.69 yr)      first obs. used      1905-07-31      last obs. used      2013-04-07      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .63705      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 12:36:40   Additional Information  Earth MOID = 2.0046 AU   T_jup = 3.130  [ 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 8.81 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 6 diameter diameter 102.81 km 2.8 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 6 rotation period rot_per 8.120 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.0500   0.003 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 6 B-V BV .775 mag .027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=5; phase (min.=.23, mean=8.39, max.=15.80) deg. U-B UB .374 mag .071 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=5; phase (min.=.23, mean=8.39, max.=15.80) deg. Tholen spectral type spec_T ST   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices SMASSII spectral type spec_B T   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) 570 Kythera (1905 QX)          Discovered 1905-Jul-30 by Wolf, M. at Heidelberg (024) Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1905 QX = 1952 BE = 1994 PG40  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-24 07:41 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin