+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   4001 Ptolemaeus (1949 PV) Classification: Main-belt Asteroid          SPK-ID: 2004001 [ 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 40 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1723514827472792 3.9563e-08   a 2.286959567627436 6.9021e-09 au q 1.892798695163771 9.0059e-08 au i 5.457997671169395 3.5359e-06 deg node 130.658829087216 3.9525e-05 deg peri 204.2378847691857 4.0924e-05 deg M 219.2831916676659 1.2563e-05 deg tp 2459694.275607558608 (2022-Apr-24.77560756) 4.5048e-05 TDB period 1263.240836881979 3.46 5.7187e-06 1.566e-08 d yr n .2849812874072197 1.2901e-09 deg/d Q 2.681120440091101 8.0917e-09 au   Orbit Determination Parameters    # obs. used (total)      2292      data-arc span      26158 days (71.62 yr)      first obs. used      1949-08-02      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .47157      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 15:49:16   Additional Information  Earth MOID = .882214 au   Jupiter MOID = 2.67963 au   T_jup = 3.575  [ 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 13.65   n/a E2021B10   diameter diameter 4.641 km 0.297 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.392   0.056 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   SMASSII spectral type spec_B S   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) 4001 Ptolemaeus (1949 PV)          Discovered 1949-Aug-02 by Reinmuth, K. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1949 PV = 1949 QD1 = 1982 BU9 = 1987 OE  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-21 03:39 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin