+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1628 Strobel (A923 RT) Classification: Main-belt Asteroid          SPK-ID: 2001628 [ 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 39 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .06681910968894458 1.9922e-08   a 3.010464070295941 1.0683e-08 au q 2.80930754136821 5.9104e-08 au i 19.38885204568675 6.7333e-07 deg node 181.1749027790482 8.0497e-07 deg peri 288.5937179574126 1.2238e-05 deg M 111.2036943337342 1.3405e-05 deg tp 2458611.160820843705 (2019-May-07.66082084) 6.9908e-05 TDB period 1907.869210347861 5.22 1.0155e-05 2.78e-08 d yr n .1886921797612958 1.0044e-09 deg/d Q 3.211620599223672 1.1397e-08 au   Orbit Determination Parameters    # obs. used (total)      3017      data-arc span      35619 days (97.52 yr)      first obs. used      1923-09-11      last obs. used      2021-03-19      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .40289      source      ORB      producer      Otto Matic      solution date      2021-May-03 19:38:04   Additional Information  Earth MOID = 1.88259 au   Jupiter MOID = 1.89399 au   T_jup = 3.160  [ 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 10.28   n/a E2021B10 IRAS observations used: 12 diameter diameter 59.345 km 0.484 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 9.418 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] [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.] [Polakis, T. (2020) Minor Planet Bull. 47, 314-321.] geometric albedo albedo 0.047   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.840   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=6.41 deg. U-B UB 0.320   0.060 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=6.41 deg. 1628 Strobel (A923 RT)          Discovered 1923-Sep-11 by Reinmuth, K. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A923 RT = 1926 GY = 1947 GC = 1949 QA2 = 1952 DV2 = 1957 CA = 1960 WH  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-May-10 22:58 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin