+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1615 Bardwell (1950 BW) Classification: Main-belt Asteroid          SPK-ID: 2001615 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 47 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1827088321209296 1.3323e-08   a 3.118744692273358 9.729e-09 au q 2.548922491864745 4.0289e-08 au i 1.690847601103662 9.4415e-07 deg node 152.4351309719028 1.7871e-05 deg peri 254.0420606476239 1.9331e-05 deg M 58.36596307410178 5.2062e-06 deg tp 2459070.344040806424 (2020-Aug-08.84404081) 2.8718e-05 TDB period 2011.722913928709 5.51 9.4135e-06 2.577e-08 d yr n .178951085911207 8.3737e-10 deg/d Q 3.688566892681971 1.1507e-08 au   Orbit Determination Parameters    # obs. used (total)      3665      data-arc span      34558 days (94.61 yr)      first obs. used      1926-10-01      last obs. used      2021-05-13      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .43251      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 12:34:44   Additional Information  Earth MOID = 1.5587 au   Jupiter MOID = 1.71033 au   T_jup = 3.190  [ 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 11.46   n/a E2021B10 IRAS observations used: 5 diameter diameter 29.139 km 0.148 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 18. h n/a LCDB (Rev. 2020-October); Warner et al., 2009 lower-limit; Result based on fragmentary lightcurve(s), may be completely wrong. Published Reference List: [Tedesco, E.F. (1979) PhD Dissertation, New. Mex. State Univ. 280pp.] geometric albedo albedo 0.060   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   B-V BV 0.692   0.033 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=2.68, mean=5.86, max.=10.14) deg. U-B UB 0.329   0.057 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=6.65, mean=8.40, max.=10.14) deg. Tholen spectral type spec_T B   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo 1615 Bardwell (1950 BW)          Discovered 1950-Jan-28 by Goethe Link Observatory at Brooklyn Discovered by the Indiana Asteroid Program, Goethe Link Observatory, University of Indiana. This program was conceived and directed by F. K. Edmondson; the plates were blinked and measured astrometrically by B. Potter and, following her retirement, by D. Owings; and the photometry was performed under the direction of T. Gehrels. During the years 1947-1967, in which the plates were exposed, a large number of people participated in various aspects of the program. Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1950 BW = 1926 TO = 1937 TJ = 1948 RB1 = 1948 RH1 = 1948 TG  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jul-29 23:12 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin