+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   406 Erna (A895 QA) Classification: Main-belt Asteroid          SPK-ID: 2000406 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 43 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1782617550040232 3.7347e-08   a 2.916792698779972 8.2865e-09 au q 2.396840113312533 1.0818e-07 au i 4.193222923836667 3.1042e-06 deg node 315.4784689261026 5.2423e-05 deg peri 37.51006056519817 5.3312e-05 deg M 46.12642089117846 1.0558e-05 deg tp 2458967.366850979124 (2020-Apr-27.86685098) 5.3199e-05 TDB period 1819.519746514003 4.98 7.7538e-06 2.123e-08 d yr n .1978544067409655 8.4314e-10 deg/d Q 3.43674528424741 9.7636e-09 au   Orbit Determination Parameters    # obs. used (total)      3512      data-arc span      43067 days (117.91 yr)      first obs. used      1903-02-20      last obs. used      2021-01-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .43402      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 00:46:18   Additional Information  Earth MOID = 1.39136 au   Jupiter MOID = 2.01104 au   T_jup = 3.253  [ 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 10.40   n/a E2021B10 IRAS observations used: 12 diameter diameter 46.266 km 0.310 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 8.789 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.] [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] geometric albedo albedo 0.060   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.738   0.036 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=9.10, mean=9.32, max.=9.53) deg. U-B UB 0.273   0.035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=9.10, mean=9.32, max.=9.53) deg. Tholen spectral type spec_T P   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo 406 Erna (A895 QA)          Discovered 1895-Aug-22 by Charlois, A. at Nice Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A895 QA = 1949 KD1 = A903 DA = A905 OB  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-27 19:03 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin