+ 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 2459000.5 (2020-May-31.0) TDB Reference: JPL 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1125865169758766 3.2862e-08   a 2.229255804511273 5.2729e-09 au q 1.978271658033093 7.4476e-08 au i 4.397001685024593 3.3278e-06 deg node 327.0724060460404 4.2014e-05 deg peri 244.8023840390994 4.454e-05 deg M 329.1391492128646 1.5459e-05 deg tp 2459104.718226884220 (2020-Sep-12.21822688) 5.2237e-05 TDB period 1215.73322579814 3.33 4.3134e-06 1.181e-08 d yr n .2961175958349387 1.0506e-09 deg/d Q 2.480239950989453 5.8666e-09 au   Orbit Determination Parameters    # obs. used (total)      3119      data-arc span      37175 days (101.78 yr)      first obs. used      1918-09-02      last obs. used      2020-06-13      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .39582      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 15:29:01   Additional Information  Earth MOID = .97747 au   Jupiter MOID = 2.49975 au   T_jup = 3.631  [ 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 11.8   n/a MPO502165   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 5.615 h n/a LCDB (Rev. 2019-August); 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.] 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 ] 2020-Oct-19 16:31 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin