+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2378 Pannekoek (1935 CY) Classification: Main-belt Asteroid          SPK-ID: 2002378 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 35 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1402088747270417 3.0454e-08   a 2.894523519963894 1.382e-08 au q 2.4886856343588 8.6794e-08 au i 14.24654490241399 3.8509e-06 deg node 180.924830400868 1.3847e-05 deg peri 265.8496510382696 1.9403e-05 deg M 226.3471735688665 1.5537e-05 deg tp 2459868.289671764853 (2022-Oct-15.78967176) 7.9772e-05 TDB period 1798.722019240039 4.92 1.2882e-05 3.527e-08 d yr n .2001420987508121 1.4334e-09 deg/d Q 3.300361405568986 1.5758e-08 au   Orbit Determination Parameters    # obs. used (total)      2694      data-arc span      37337 days (102.22 yr)      first obs. used      1918-09-16      last obs. used      2020-12-06      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42898      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 01:02:33   Additional Information  Earth MOID = 1.55333 au   Jupiter MOID = 2.06146 au   T_jup = 3.229  [ 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 11.07   n/a E2021B10   diameter diameter 40.373 km 0.706 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 11.874 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Oey, J. (2011) http://minorplanet.haoeydental.com.au] [Stephens, R.D.; Warner, B.D. (2019) Minor Planet Bull. 46, 449-456.] geometric albedo albedo 0.057   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   SMASSII spectral type spec_B Cgh   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 2378 Pannekoek (1935 CY)          Discovered 1935-Feb-13 by Van Gent, H. at Johannesburg (LS) Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1935 CY = 1935 EP = 1938 UD1 = 1960 HD = 1967 RB1 = 1970 GP1 = 1970 JG = 1972 RH3 = 1975 JH = 1977 RR5 = 1977 XJ = A918 RE  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-02 18:09 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin