+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   17 Thetis Classification: Main-belt Asteroid          SPK-ID: 2000017 [ 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 72 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1339613711052189 2.9634e-08   a 2.469757907744916 2.9042e-09 AU q 2.13890575212545 7.2954e-08 AU i 5.588522066771778 3.2468e-06 deg node 125.5904663731616 2.9217e-05 deg peri 135.4642566621479 3.061e-05 deg M 105.9240198328796 9.801e-06 deg tp 2455983.369489430247 (2012-Feb-25.86948943) 3.8356e-05 JED period 1417.685847289739 3.88 2.5006e-06 6.846e-09 d yr n .2539349607589228 4.479e-10 deg/d Q 2.800610063364382 3.2932e-09 AU   Orbit Determination Parameters    # obs. used (total)      2341      data-arc span      58667 days (160.62 yr)      first obs. used      1852-04-23      last obs. used      2012-12-07      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .70254      data source      ORB      producer      Otto Matic      solution date      2013-Mar-29 14:32:41   Additional Information  Earth MOID = 1.12779 AU   T_jup = 3.466  [ 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 7.76 mag n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 10 diameter diameter 90.04 km 3.7 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 10 rotation period rot_per 12.27048 h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) sidereal period (not synodic) Published Reference List: [Groeneveld, I.; Kuiper, G.P. (1954) Astrophys. J. 120, 200-220.] [Michalowski, T.; Velichko, F.P.; Di Martino, M.; Krugly, et al. (1995) Icarus 118, 292-301.] [Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.] [Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Durech, J.; Kaasalainen, M.; Warner, B.D.; Fauerbach, M.; et al. (2009) Astron. Astrophys. 493, 291-297.] [Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.] [Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.1715   0.015 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 10 B-V BV .829 mag .022 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=25; phase (min.=.64, mean=7.44, max.=23.88) deg. U-B UB .438 mag .035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=23; phase (min.=.64, mean=7.45, max.=23.88) deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B Sl   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) 17 Thetis          Discovered 1852-Apr-17 by Luther, R. at Dusseldorf Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1954 SO1 = A913 CA = A916 YF  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-20 00:11 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin