+ 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 38 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07103118938262799 3.3329e-08   a 3.393642608588095 1.8464e-08 au q 3.152588137760518 1.1276e-07 au i 4.531952023050001 3.8597e-06 deg node 82.50549247108465 5.2957e-05 deg peri 204.5591559040475 6.1023e-05 deg M 179.435143120111 3.0575e-05 deg tp 2457862.341915862177 (2017-Apr-18.84191586) 0.00019547 TDB period 2283.481948769338 6.25 1.8636e-05 5.102e-08 d yr n .1576539723443046 1.2867e-09 deg/d Q 3.634697079415672 1.9776e-08 au   Orbit Determination Parameters    # obs. used (total)      3039      data-arc span      39679 days (108.64 yr)      first obs. used      1911-09-03      last obs. used      2020-04-22      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .41094      source      ORB      producer      Otto Matic      solution date      2020-May-20 01:20:01   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. 2019-August); 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 ] 2020-Jul-03 14:59 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin