+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   557 Violetta (A905 BD) Classification: Main-belt Asteroid          SPK-ID: 2000557 [ 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 36 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09930955618322113 2.5665e-08   a 2.442203367518708 6.0738e-09 au q 2.199669234981257 6.1366e-08 au i 2.489711973281634 2.6855e-06 deg node 292.7918400349802 8.881e-05 deg peri 194.8582181031629 9.1081e-05 deg M 81.67789457191805 1.9965e-05 deg tp 2458684.218930237036 (2019-Jul-19.71893024) 7.7277e-05 TDB period 1394.026936069113 3.82 5.2005e-06 1.424e-08 d yr n .2582446512942789 9.6339e-10 deg/d Q 2.684737500056158 6.677e-09 au   Orbit Determination Parameters    # obs. used (total)      3495      data-arc span      42259 days (115.70 yr)      first obs. used      1905-01-15      last obs. used      2020-09-27      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .43702      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:28:19   Additional Information  Earth MOID = 1.21488 au   Jupiter MOID = 2.35625 au   T_jup = 3.493  [ 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 12.1   n/a MPO431497   diameter diameter 22.621 km 0.147 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 5.0887 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Pilcher, F. (2008) Minor Planet Bull. 35, 135-138.] [Kaminski, L.J.; Leake, M.A.; Berget, D.J. (2010) J. SE Assoc. for Research in Astron. 3, 25-31.] geometric albedo albedo 0.084   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   557 Violetta (A905 BD)          Discovered 1905-Jan-26 by Wolf, M. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A905 BD = 1932 EH1 = 1947 CD  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-21 18:49 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin