+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1241 Dysona (1932 EB1) Classification: Main-belt Asteroid          SPK-ID: 2001241 [ 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 39 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1012872967226662 4.032e-08   a 3.187721530140017 1.655e-08 au q 2.864845833647493 1.2736e-07 au i 23.51972165442725 5.2641e-06 deg node 322.1821347354055 9.6065e-06 deg peri 320.3462031656004 2.8151e-05 deg M 103.0738708272482 2.8127e-05 deg tp 2458405.297049395150 (2018-Oct-13.79704940) 0.00016198 TDB period 2078.830071074633 5.69 1.6189e-05 4.432e-08 d yr n .1731743277188121 1.3486e-09 deg/d Q 3.51059722663254 1.8226e-08 au   Orbit Determination Parameters    # obs. used (total)      2456      data-arc span      36669 days (100.39 yr)      first obs. used      1920-03-10      last obs. used      2020-08-01      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .37815      source      ORB      producer      Otto Matic      solution date      2020-Aug-24 22:30:44   Additional Information  Earth MOID = 1.87946 au   Jupiter MOID = 1.87384 au   T_jup = 3.060  [ 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 9.5   n/a MPO502165 IRAS observations used: 17 diameter diameter 79.190 km 0.694 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 8.6080 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Behrend, R. (2002) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Oey, J.; Vilagi, J.; Gajdos, S.; Kornos, L.; Galad, A. (2007) Minor Planet Bull. 34, 81-83.] [Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.] geometric albedo albedo 0.047   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.750   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=2.12 deg. U-B UB 0.290   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=2.12 deg. Tholen spectral type spec_T PDC   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices; used ground-based radiometric albedo 1241 Dysona (1932 EB1)          Discovered 1932-Mar-04 by Wood, H. E. at Johannesburg (UO) Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1932 EB1 = 1931 AA1 = 1945 RA = 1948 CE = 1956 PB = A908 DC = A920 EB  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Sep-23 04:37 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin