+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   258 Tyche (A886 JA) Classification: Main-belt Asteroid          SPK-ID: 2000258 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 77 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2043527531586794 3.5954e-08   a 2.615525376918063 6.0508e-09 au q 2.081035565188464 9.4435e-08 au i 14.32165003710592 3.9756e-06 deg node 207.5520070652952 1.7317e-05 deg peri 155.6104661345302 2.0086e-05 deg M 123.3256594378171 1.0497e-05 deg tp 2458471.217201745288 (2018-Dec-18.71720175) 4.4712e-05 TDB period 1545.029706228905 4.23 5.3615e-06 1.468e-08 d yr n .2330052286688292 8.0856e-10 deg/d Q 3.150015188647663 7.2873e-09 au   Orbit Determination Parameters    # obs. used (total)      2871      data-arc span      49134 days (134.52 yr)      first obs. used      1886-05-09      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .47845      source      ORB      producer      Otto Matic      solution date      2020-Dec-17 19:32:22   Additional Information  Earth MOID = 1.08837 au   Jupiter MOID = 2.3511 au   T_jup = 3.334  [ hide covariance matrix ] Orbital Elements at Epoch 2455393.5 (2010-Jul-16.0) TDB Reference: JPL 77 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2059874991899605 3.6216e-08   q 2.076527507377568 9.54e-08 au tp 2455376.933285868506 (2010-Jun-29.43328587) 4.2958e-05 TDB node 207.6541109708806 1.7364e-05 deg peri 154.7160671589438 2.0028e-05 deg i 14.29978418549457 3.9732e-06 deg   Orbit Determination Parameters    # obs. used (total)      2871      data-arc span      49134 days (134.52 yr)      first obs. used      1886-05-09      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .47845      source      ORB      producer      Otto Matic      solution date      2020-Dec-17 19:32:22   Additional Information  Jupiter MOID = 2.3511 au   T_jup = 3.334  Orbit Covariance (6×6)   e q tp node peri i e 1.311594479029847E-15 -3.450761364724141E-15 -2.875904192436623E-13 -3.053987017731989E-15 -8.333022365009158E-14 -1.883154229950404E-15 q -3.450761364724141E-15 9.101105147349506E-15 7.585012988007547E-13 9.334228983030032E-15 2.183360848592687E-13 5.053504796239295E-15 tp -2.875904192436623E-13 7.585012988007547E-13 1.845371887080148E-9 -1.586019647669354E-12 4.500948507101957E-10 1.136179621359766E-12 node -3.053987017731989E-15 9.334228983030032E-15 -1.586019647669354E-12 3.01507688084718E-10 -2.919356667650871E-10 -3.355794346219127E-12 peri -8.333022365009158E-14 2.183360848592687E-13 4.500948507101957E-10 -2.919356667650871E-10 4.011288503326443E-10 3.518545510431368E-12 i -1.883154229950404E-15 5.053504796239295E-15 1.136179621359766E-12 -3.355794346219127E-12 3.518545510431368E-12 1.578653906356015E-11 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 8.3   n/a MPO502155 IRAS observations used: 23 magnitude slope G 0.23   n/a PDS3 (MPC 17258) Fit diameter diameter 64.78 km 1.2 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 23 rotation period rot_per 10.041 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Harris, A.W.; Young, J.W. (1989) Icarus 81, 314-364.] [Schober, H.J.; Erikson, A.; Hahn, G.; Lagerkvist, C.-I.; et al. (1994) Astron. Astrophys. Suppl. Ser. 105, 281-300.] [Behrend, R. (2001) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Riccioli, D.; Blanco, C.; Cigna, M. (2001) Planet. Space Sci. 49, 657-671.] [Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.] [Behrend, R. (2014) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.1676   0.006 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 23 B-V BV 0.876   0.025 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=7.39, mean=14.10, max.=25.73) deg. U-B UB 0.459   0.036 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=7.39, mean=14.10, max.=25.73) deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices SMASSII spectral type spec_B S   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) 258 Tyche (A886 JA)          Discovered 1886-May-04 by Luther, R. at Dusseldorf Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-19 15:40 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin