+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 44 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1760558765808669 1.6767e-08   a 3.132300664723227 1.0119e-08 au q 2.580840725480547 5.428e-08 au i 1.778392351065967 1.0241e-06 deg node 161.7022877837178 1.5571e-05 deg peri 139.3423152486386 1.6953e-05 deg M 344.0957073438843 5.0099e-06 deg tp 2459289.955170680830 (2021-Mar-16.45517068) 2.8266e-05 TDB period 2024.853424255581 5.54 9.8118e-06 2.686e-08 d yr n .1777906468130406 8.6152e-10 deg/d Q 3.683760603965907 1.19e-08 au   Orbit Determination Parameters    # obs. used (total)      3698      data-arc span      41954 days (114.86 yr)      first obs. used      1905-11-20      last obs. used      2020-10-01      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .44995      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 12:12:02   Additional Information  Earth MOID = 1.56368 au   Jupiter MOID = 1.5531 au   T_jup = 3.188  [ 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 10.66   n/a E2021B10 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-Jun-22 08:58 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin