+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1247 Memoria (1932 QA) Classification: Main-belt Asteroid          SPK-ID: 2001247 [ 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 .1756483769178498 2.6693e-08   a 3.130439413726868 1.1061e-08 au q 2.580582811666079 8.6637e-08 au i 1.778286345396717 3.3514e-06 deg node 161.7213745730244 0.00011324 deg peri 139.4288650992073 0.00011379 deg M 308.4135824628797 1.2284e-05 deg tp 2459290.394015128954 (2021-Mar-16.89401513) 6.9543e-05 TDB period 2023.048903741517 5.54 1.0722e-05 2.936e-08 d yr n .1779492326330816 9.4311e-10 deg/d Q 3.680296015787658 1.3003e-08 au   Orbit Determination Parameters    # obs. used (total)      3653      data-arc span      41954 days (114.86 yr)      first obs. used      1905-11-20      last obs. used      2020-10-01      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .45181      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:21:00   Additional Information  Earth MOID = 1.56542 au   Jupiter MOID = 1.55734 au   T_jup = 3.189  [ 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 10.6   n/a MPO473780 IRAS observations used: 5 diameter diameter 38.906 km 0.174 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 18.79 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Behrend, R. (2019) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Polakis, T. (2020) Minor Planet Bull. 47, 314-321.] geometric albedo albedo 0.078   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   B-V BV 0.680   0.013 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=1.04, mean=3.26, max.=5.49) deg. U-B UB 0.290   0.071 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=1.04, mean=3.26, max.=5.49) deg. Tholen spectral type spec_T CXF   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices 1247 Memoria (1932 QA)          Discovered 1932-Aug-30 by Laugier, M. at Uccle Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1932 QA = 1927 UL = 1931 JU = 1936 FN = A905 WA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-21 06:35 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin