+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   405 Thia (A895 OB) Classification: Main-belt Asteroid          SPK-ID: 2000405 [ 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 114 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2431038925204059 3.5826e-08   a 2.585145143140131 5.2347e-09 au q 1.956686296112543 9.2125e-08 au i 11.93881569630255 3.5091e-06 deg node 255.2168582319588 1.8347e-05 deg peri 308.8632868084159 1.9505e-05 deg M 99.30711965262199 8.9479e-06 deg tp 2458581.702858136341 (2019-Apr-08.20285814) 3.7293e-05 TDB period 1518.188943534994 4.16 4.6113e-06 1.263e-08 d yr n .2371246355949385 7.2024e-10 deg/d Q 3.213603990167719 6.5073e-09 au   Orbit Determination Parameters    # obs. used (total)      2798      data-arc span      44342 days (121.40 yr)      first obs. used      1899-06-22      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .44028      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:53:23   Additional Information  Earth MOID = .975266 au   Jupiter MOID = 1.88028 au   T_jup = 3.351  [ 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 8.6   n/a MPO492753 IRAS observations used: 15 diameter diameter 108.894 km 0.312 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 9.950 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Harris, A.W.; Young, J.W. (1980) Icarus 43, 20-32.] [Wang, X.-B. (2002) Earth, Moon, and Planets 91, 25-30.] [Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.] geometric albedo albedo 0.018   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)   B-V BV 0.698   0.019 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=2.35, mean=16.80, max.=27.16) deg. U-B UB 0.388   0.039 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=2.35, mean=16.80, max.=27.16) deg. Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices SMASSII spectral type spec_B Ch   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) 405 Thia (A895 OB)          Discovered 1895-Jul-23 by Charlois, A. at Nice Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A895 OB = 1950 XA = 1951 AO = 1956 EZ  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-23 16:23 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin