+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 47 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .101110202212538 1.8129e-08   a 3.188579673043838 1.53e-08 au q 2.866181737531587 5.8603e-08 au i 23.51964858260674 6.7298e-07 deg node 322.1790328334829 2.732e-06 deg peri 320.4742313317792 1.5948e-05 deg M 137.5782582127958 1.9711e-05 deg tp 2458405.729675781466 (2018-Oct-14.22967578) 0.00011174 TDB period 2079.669567237341 5.69 1.4969e-05 4.098e-08 d yr n .1731044227753107 1.2459e-09 deg/d Q 3.510977608556089 1.6847e-08 au   Orbit Determination Parameters    # obs. used (total)      2939      data-arc span      36894 days (101.01 yr)      first obs. used      1920-03-10      last obs. used      2021-03-14      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .35096      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 12:11:27   Additional Information  Earth MOID = 1.87866 au   Jupiter MOID = 1.87308 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 9.60   n/a E2021B10 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 8.6092 h n/a LCDB (Rev. 2020-October); 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.] [Behrend, R. (2019) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] 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 ] 2021-Apr-21 06:24 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin