+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   399 Persephone (A895 DD) Classification: Main-belt Asteroid          SPK-ID: 2000399 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 42 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07593300631009005 4.596e-08   a 3.050143276198436 1.2191e-08 au q 2.818536727560181 1.4074e-07 au i 13.11385896412043 5.2307e-06 deg node 346.1966830455467 1.6106e-05 deg peri 193.4019680819629 2.9981e-05 deg M 154.6077887108261 2.6712e-05 deg tp 2458164.882252895831 (2018-Feb-15.38225290) 0.00014298 TDB period 1945.713029504292 5.33 1.1665e-05 3.194e-08 d yr n .1850221458874215 1.1093e-09 deg/d Q 3.281749824836691 1.3117e-08 au   Orbit Determination Parameters    # obs. used (total)      3157      data-arc span      45912 days (125.70 yr)      first obs. used      1895-02-27      last obs. used      2020-11-10      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .41152      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:53:18   Additional Information  Earth MOID = 1.82457 au   Jupiter MOID = 1.6997 au   T_jup = 3.193  [ 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 9.0   n/a MPO347514   diameter diameter 39.566 km 1.885 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 9.136 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Bembrick, C. (2002) Minor Planet Bull. 29, 76-78.] [Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.] [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.] geometric albedo albedo 0.311   0.023 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   SMASSII spectral type spec_B X   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) 399 Persephone (A895 DD)          Discovered 1895-Feb-23 by Wolf, M. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A895 DD = 1948 CC  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-17 20:19 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin