+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   967 Helionape (A921 VE) Classification: Main-belt Asteroid          SPK-ID: 2000967 [ 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 34 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1687132584313601 3.205e-08   a 2.225890718338101 5.6023e-09 au q 1.850353442335159 7.0634e-08 au i 5.412733839959285 3.4366e-06 deg node 82.35251814347049 3.9852e-05 deg peri 231.8545705937426 4.1448e-05 deg M 334.5577266881686 1.332e-05 deg tp 2459086.225020488391 (2020-Aug-24.72502049) 4.5004e-05 TDB period 1212.981520856062 3.32 4.5794e-06 1.254e-08 d yr n .2967893523603969 1.1205e-09 deg/d Q 2.601427994341043 6.5475e-09 au   Orbit Determination Parameters    # obs. used (total)      3164      data-arc span      34957 days (95.71 yr)      first obs. used      1924-10-02      last obs. used      2020-06-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .39839      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 15:23:56   Additional Information  Earth MOID = .842105 au   Jupiter MOID = 2.666 au   T_jup = 3.621  [ 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 11.8   n/a MPO263352   diameter diameter 10.216 km 0.362 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 3.234 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Apostolovska, G.; Ivanova, V. Kostov, A. (2009) Minor Planet Bull. 36, 27-28.] [Kryszczynska, A.; Colas, F.; Polinska, M.; Hirsch, R.; et al. (2012) Astron. Astrophys. 546, A72.] [Klinglesmith III, D.A.; Hendrickx, S.; Madden, K.; Montgomery, S. (2016) Minor Planet Bull. 43, 234-239.] geometric albedo albedo 0.294   0.054 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   967 Helionape (A921 VE)          Discovered 1921-Nov-09 by Baade, W. at Bergedorf Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A921 VE = A922 AB  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Aug-15 05:42 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin