+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   17 Thetis (A852 HA) Classification: Main-belt Asteroid          SPK-ID: 2000017 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 113 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1333227447023434 2.6316e-08   a 2.470964688686002 3.0678e-09 au q 2.141528894327813 6.4849e-08 au i 5.592660718860978 2.8698e-06 deg node 125.5396833138738 2.5786e-05 deg peri 135.974134971005 2.7265e-05 deg M 45.07427507788044 9.7002e-06 deg tp 2458822.866658449915 (2019-Dec-05.36665845) 3.8096e-05 TDB period 1418.725045439768 3.88 2.6421e-06 7.234e-09 d yr n .2537489566122442 4.7256e-10 deg/d Q 2.800400483044191 3.4768e-09 au   Orbit Determination Parameters    # obs. used (total)      3824      data-arc span      61571 days (168.57 yr)      first obs. used      1852-04-17      last obs. used      2020-11-13      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .54839      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:50:24   Additional Information  Earth MOID = 1.13008 au   Jupiter MOID = 2.2735 au   T_jup = 3.465  [ 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 7.7   n/a MPO492748 IRAS observations used: 10 diameter diameter 84.899 km 2.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 12.27048 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 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.] [Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.] [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] geometric albedo albedo 0.193   0.028 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.829   0.022 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=25; phase (min.=.64, mean=7.44, max.=23.88) deg. U-B UB 0.438   0.035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #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 (A852 HA)          Discovered 1852-Apr-17 by Luther, R. at Dusseldorf Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A852 HA = 1954 SO1 = A913 CA = A916 YF  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-28 14:39 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin