+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   504 Cora (A902 NB) Classification: Main-belt Asteroid          SPK-ID: 2000504 [ 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 38 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2150721148949186 3.9885e-08   a 2.722605363082915 8.2606e-09 au q 2.137048869620425 1.0893e-07 au i 12.89823301623201 3.9743e-06 deg node 104.4755062674925 1.9129e-05 deg peri 248.2442907991475 2.0742e-05 deg M 49.95027151340044 9.0904e-06 deg tp 2458772.827370808499 (2019-Oct-16.32737081) 4.1177e-05 TDB period 1640.874894683046 4.49 7.4678e-06 2.045e-08 d yr n .219395153869752 9.985e-10 deg/d Q 3.308161856545405 1.0037e-08 au   Orbit Determination Parameters    # obs. used (total)      2901      data-arc span      42405 days (116.10 yr)      first obs. used      1903-12-29      last obs. used      2020-02-03      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .43547      source      ORB      producer      Otto Matic      solution date      2020-Feb-22 15:28:54   Additional Information  Earth MOID = 1.16894 au   Jupiter MOID = 2.22624 au   T_jup = 3.288  [ 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 10.0   n/a MPO435699   diameter diameter 30.438 km 0.298 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 7.587 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Higgins, D. (2011) Minor Planet Bull. 38, 41-46.] [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] [Pilcher, F. (2018) Minor Planet Bull. 45, 356-359.] [Polakis, T. (2018) Minor Planet Bull. 45, 347-352.] geometric albedo albedo 0.239   0.032 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) 504 Cora (A902 NB)          Discovered 1902-Jun-30 by Bailey, S. I. at Arequipa Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  A902 NB = 1947 OH  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Jul-04 19:38 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin