+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2055 Dvorak (1974 DB) Classification: Mars-crossing Asteroid          SPK-ID: 2002055 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 32 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3113969092164766 3.2642e-08   a 2.310344220366521 8.7146e-09 au q 1.590910170918236 7.509e-08 au i 21.48645224697157 5.2335e-06 deg node 340.4152982764622 1.0603e-05 deg peri 244.2386615304722 1.399e-05 deg M 22.04436417728882 1.066e-05 deg tp 2458921.956809431137 (2020-Mar-13.45680943) 3.7889e-05 TDB period 1282.665645395276 3.51 7.2573e-06 1.987e-08 d yr n .2806655041338226 1.588e-09 deg/d Q 3.029778269814805 1.1428e-08 au   Orbit Determination Parameters    # obs. used (total)      1955      data-arc span      17054 days (46.69 yr)      first obs. used      1974-02-19      last obs. used      2020-10-29      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .36053      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:13:00   Additional Information  Earth MOID = .692828 au   Jupiter MOID = 2.26654 au   T_jup = 3.431  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 12.8   n/a MPO365269   rotation period rot_per 4.405 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Mazzone, F.; Colazo, C.; Mina, F.; Meilia, R.; Spagnotto, J.; Bernal, A. (2014) Minor Planet Bull. 41, 17-19.] [Oey, J. (2014) Minor Planet Bull. 41, 276-281.] 2055 Dvorak (1974 DB)          Discovered 1974-Feb-19 by Kohoutek, L. at Bergedorf Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Dec-02 13:30 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin