+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   313 Chaldaea (A891 QB) Classification: Main-belt Asteroid          SPK-ID: 2000313 [ 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 96 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .182030370942586 3.1936e-08   a 2.374572955507042 3.2868e-09 au q 1.942328559585862 7.5922e-08 au i 11.65129028168427 3.7088e-06 deg node 176.5810374884327 1.4545e-05 deg peri 316.0254228440168 1.6753e-05 deg M 279.284078242722 9.0419e-06 deg tp 2459300.163199812870 (2021-Mar-26.66319981) 3.3784e-05 TDB period 1336.523818151231 3.66 2.775e-06 7.598e-09 d yr n .2693554690989167 5.5925e-10 deg/d Q 2.806817351428221 3.8851e-09 au   Orbit Determination Parameters    # obs. used (total)      3207      data-arc span      46648 days (127.72 yr)      first obs. used      1893-02-24      last obs. used      2020-11-13      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .49338      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:52:41   Additional Information  Earth MOID = .97232 au   Jupiter MOID = 2.26698 au   T_jup = 3.492  [ 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 9.0   n/a MPO502155 IRAS observations used: 17 diameter diameter 71.183 km 17.773 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)   rotation period rot_per 8.392 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Hainaut-Rouelle, M.-C.; Hainaut, O.R.; Detal, A. (1995) Astron. Astrophys. Suppl. Ser. 112, 125-142.] [Behrend, R. (2003) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Shevchenko, V.G.; Chiorny, V.G.; Gaftonyuk, N.M.; Krugly, Yu.N.; et al. (2005) Abstr. IAU Symp. 229, p. 133.] [Hawkins, S.; Ditteon, R. (2008) Minor Planet Bull. 35, 1-4.] [Shevchenko, V.G.; Chiorny, V.G.; Gaftonyuk, M.; Krugly, Y.N.; et al. (2008) Icarus 196, 601-611.] [Sheridan, E.E. (2009) Minor Planet Bull. 36, 55-56.] [Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.] [Behrend, R. (2015) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] [Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Carbognani, A.; Cellino, A.; Caminiti, S. (2019) Planet. Space Sci. 169, 15-34.] geometric albedo albedo 0.044   0.016 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)   B-V BV 0.715   0.014 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=9; phase (min.=3.46, mean=10.74, max.=28.29) deg. U-B UB 0.342   0.015 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=9; phase (min.=3.46, mean=10.34, max.=24.71) deg. Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo 313 Chaldaea (A891 QB)          Discovered 1891-Aug-30 by Palisa, J. at Vienna Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-17 22:05 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin