+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1330 Spiridonia (1925 DB) Classification: Main-belt Asteroid          SPK-ID: 2001330 [ 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 38 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07475317975810788 3.7832e-08   a 3.172202215811454 1.5127e-08 au q 2.935070013343832 1.2231e-07 au i 15.95239919934294 4.2965e-06 deg node 158.8060881371216 1.3315e-05 deg peri 4.14501056142926 2.8406e-05 deg M 278.9820224340471 2.6175e-05 deg tp 2459464.928240589038 (2021-Sep-07.42824059) 0.00015102 TDB period 2063.667492513608 5.65 1.4762e-05 4.042e-08 d yr n .1744467077695299 1.2478e-09 deg/d Q 3.409334418279075 1.6258e-08 au   Orbit Determination Parameters    # obs. used (total)      2731      data-arc span      35564 days (97.37 yr)      first obs. used      1922-09-21      last obs. used      2020-02-03      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42123      source      ORB      producer      Otto Matic      solution date      2020-Feb-22 15:52:05   Additional Information  Earth MOID = 1.94366 au   Jupiter MOID = 1.57077 au   T_jup = 3.138  [ 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 10.1   n/a MPO452177   diameter diameter 68.417 km 0.584 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 9.67 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Behrend, R. (2001) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Stephens, R.D. (2005) Minor Planet Bull. 32, 66-68.] [Stephens, R.D. (2013) Minor Planet Bull. 40, 34-35.] [Behrend, R. (2017) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] geometric albedo albedo 0.032   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.670   0.028 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=14.51, mean=14.52, max.=14.53) deg. U-B UB 0.170   0.045 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=14.51, mean=14.52, max.=14.53) deg. Tholen spectral type spec_T P   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices; used ground-based radiometric albedo 1330 Spiridonia (1925 DB)          Discovered 1925-Feb-17 by Albitzkij, V. at Simeis Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1925 DB = 1931 FA = 1933 QK1 = 1942 ED = 1950 OP = 1959 EZ = A922 SA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Jul-16 17:21 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin