+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1274 Delportia (1932 WC) Classification: Main-belt Asteroid          SPK-ID: 2001274 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 34 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1127881871654667 1.5707e-08   a 2.230088576595646 4.8333e-09 au q 1.978560928823007 3.5793e-08 au i 4.397028136341077 7.6596e-07 deg node 327.071541912756 6.966e-06 deg peri 245.0200624206462 9.3979e-06 deg M 86.17192050236575 9.0322e-06 deg tp 2459105.331179056360 (2020-Sep-12.83117906) 3.0237e-05 TDB period 1216.414522603481 3.33 3.9545e-06 1.083e-08 d yr n .2959517445003 9.6213e-10 deg/d Q 2.481616224368286 5.3784e-09 au   Orbit Determination Parameters    # obs. used (total)      3305      data-arc span      37552 days (102.81 yr)      first obs. used      1918-09-02      last obs. used      2021-06-25      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .39482      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 12:11:08   Additional Information  Earth MOID = .978339 au   Jupiter MOID = 2.49645 au   T_jup = 3.630  [ 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 11.92   n/a MPO614063   diameter diameter 9.611 km 0.121 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 5.56 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Sheridan, E. (2011) Posting on CALL site. http://www.minorplanet.info/call.html] [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] [Benishek, V. (2020) Minor Planet Bull. 47, 231-241.] geometric albedo albedo 0.461   0.057 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.895   0.038 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=2.83, mean=3.79, max.=4.75) deg. U-B UB 0.525   0.052 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=2.83, mean=3.79, max.=4.75) deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices 1274 Delportia (1932 WC)          Discovered 1932-Nov-28 by Delporte, E. at Uccle Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1932 WC = 1926 AA = 1928 RX = 1934 JD = A918 RA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jul-28 05:51 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin