+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 37 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09909613576769295 1.0168e-08   a 2.442874606344359 5.7484e-09 au q 2.200795172690609 2.4453e-08 au i 2.489588797312216 6.1466e-07 deg node 292.7933310401788 2.0316e-05 deg peri 194.9912657657527 2.8021e-05 deg M 133.1924138388592 1.3747e-05 deg tp 2458684.526759960254 (2019-Jul-20.02675996) 5.3227e-05 TDB period 1394.601697353693 3.82 4.9226e-06 1.348e-08 d yr n .2581382201693237 9.1116e-10 deg/d Q 2.68495403999811 6.3181e-09 au   Orbit Determination Parameters    # obs. used (total)      3537      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      .43546      source      ORB      producer      Otto Matic      solution date      2021-Mar-16 11:22:14   Additional Information  Earth MOID = 1.21591 au   Jupiter MOID = 2.35496 au   T_jup = 3.492  [ 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 12.20   n/a E2021B10   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-Apr-11 16:35 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin