+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1154 Astronomia (1927 CB) Classification: Outer Main-belt Asteroid          SPK-ID: 2001154 [ 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 43 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07103119164685462 3.3187e-08   a 3.3936426112766 1.7998e-08 au q 3.15258813257408 1.1255e-07 au i 4.531952299884664 3.8195e-06 deg node 82.50548791498281 5.2231e-05 deg peri 204.559156713749 6.0103e-05 deg M 179.4351461066017 3.0178e-05 deg tp 2457862.341895566346 (2017-Apr-18.84189557) 0.00019263 TDB period 2283.481951482862 6.25 1.8165e-05 4.973e-08 d yr n .1576539721569601 1.2542e-09 deg/d Q 3.634697089979121 1.9276e-08 au   Orbit Determination Parameters    # obs. used (total)      3128      data-arc span      39885 days (109.20 yr)      first obs. used      1911-09-03      last obs. used      2020-11-14      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .40633      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 01:58:44   Additional Information  Earth MOID = 2.13695 au   Jupiter MOID = 1.48044 au   T_jup = 3.139  [ 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 10.4   n/a MPO502164 IRAS observations used: 17 diameter diameter 55.715 km 0.500 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 18.1154 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Brincat, S.M. (2017) Minor Planet Bull. 44, 1-2.] geometric albedo albedo 0.036   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.658   0.041 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=15.86 deg. U-B UB 0.229   0.066 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=15.86 deg. Tholen spectral type spec_T FXU:   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices 1154 Astronomia (1927 CB)          Discovered 1927-Feb-08 by Reinmuth, K. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1927 CB = A911 RA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-28 06:28 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin