1615 Bardwell

Rare-type main-belt asteroid October 2019 yes 1615 Bardwell #D6D6D6 28 January 1950 Indiana University(Indiana Asteroid Program) Goethe Link Obs. (1615) Bardwell 1950 BW1926 TO1937 TJ1948 RB 11948 RH 11948 TG Conrad Bardwell (astronomer) main-beltThemis 4 September 2017 (JD 2458000.5) 0 90.49 yr (33,053 days) 3.6887 AU 2.5664 AU 3.1275 AU 0.1794 5.53 yr (2,020 days) 169.71° 0.1782 ms / day 1.6901° 152.55° 252.97° 21.92 5.97 km25.01 1.49 km27.78 1.6 km (IRAS:5)28.8 2.9 km29.139 0.148 km31 3 km31.579 0.250 km 18 hLCDB-Tedesco-1979 0.0497 0.01920.05 0.010.060 0.0100.0642 0.008 (IRAS:5)0.079 0.0150.09 0.06 Tholen = BBB–V = 0.692U–B = 0.329 11.3811.46 1615 Bardwell, provisional designation 1950 BW, is a rare-type Themistian asteroid from the outer region of the asteroid belt, approximately 27 kilometers in diameter. It was discovered on 28 January 1950, by IU's Indiana Asteroid Program at Goethe Link Observatory near Brooklyn, Indiana, United States. It is named for American astronomer Conrad Bardwell. Orbit and classification Bardwell is a member of the Themis family, a dynamical family of outer-belt asteroids with nearly coplanar ecliptical orbits. It orbits the Sun at a distance of 2.6–3.7 AU once every 5 years and 6 months (2,020 days). Its orbit has an eccentricity of 0.18 and an inclination of 2° with respect to the ecliptic. Its orbit has an eccentricity of 0.18 and an inclination of 2° with respect to the ecliptic. It was first identified as 1926 TO at Simeiz Observatory in 1926, extending the body's observation arc by 24 years prior to its official discovery observation. Naming This minor planet was named for Conrad M. Bardwell (1926–2010), who was a research associate at the Cincinnati Observatory and later associate director of the Minor Planet Center in Cambridge, Massachusetts, United States. Bardwell successfully established numerous identifications from observations in widely separated oppositions and provided observers with reliable data of orbital elements. The official 1615 naming citation was published by the Minor Planet Center on 15 June 1974 (M.P.C. 3643). Physical characteristics In the Tholen taxonomy, Bardwell is a blueish B-type asteroid, a rare subtype of the abundant carbonaceous C-types found in the outer belt. The spectra of B-type bodies show a broad absorption feature at one micron wavelength that is associated with the presence of magnetite and is what gives the asteroid its blue tint. There are only a few dozens asteroids of this type known to exist. Rotation period In the late 1970s, a rotational lightcurve of Bardwell was obtained by American astronomer Edward Tedesco. It gave a provisional rotation period of 18 hours with a change in brightness of 0.2 magnitude (U=1).LCDB-Tedesco-1979 As of 2017, no other photometric analysis of Bardwell has been made. Diameter and albedo According to the surveys carried out by the Infrared Astronomical Satellite IRAS and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Bardwell measures between 21.92 and 31.58 kilometers in diameter, and its surface has an albedo between 0.049 and 0.09. The Collaborative Asteroid Lightcurve Link agrees with the results obtained by IRAS, that is, an albedo of 0.0642 and a diameter of 27.78 kilometers based on an absolute magnitude of 11.38. Notes LCDB-Tedesco-1979 Tedesco, E.F. (1979) PhD Dissertation, New. Mex. State Univ. 280pp.; Rotation period of 18 hours with a brightness amplitude of 0.2. Summary figures at http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1615%7CBardwell Asteroid Lightcurve Database for (1615) Bardwell References 30em 2017-03-30 last obs. JPL Small-Body Database Browser: 1615 Bardwell (1950 BW) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001615 Jet Propulsion Laboratory 4 June 2017 Dictionary of Minor Planet Names – (1615) Bardwell Schmadel Lutz D. Springer Berlin Heidelberg 128 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1616 (1615) Bardwell 1615 Bardwell (1950 BW) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1615 28 December 2016 Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008) Appendix – Publication Dates of the MPCs Schmadel Lutz D. 2009 Springer Berlin Heidelberg 221 978-3-642-01964-7 10.1007/978-3-642-01965-4 2009dmpn.book.....S JPL Small-Body Database JPL db query spectral type = B (SMASSII and/or Tholen) http://ssd.jpl.nasa.gov/sbdb_query.cgi?obj_group=all;obj_kind=all;obj_numbered=all;OBJ_field=0;ORB_field=0;combine_mode=OR;c1_group=OBJ;c1_item=Ax;c1_op=%3D;c1_value=B;c2_group=OBJ;c2_item=Ay;c2_op=%3D;c2_value=B;table_format=HTML;max_rows=100;format_option=comp;c_fields=AcBhBgBjBiBnBsAiApAyAx;.cgifields=format_option;.cgifields=ast_orbit_class;.cgifields=combine_mode;.cgifields=table_format;.cgifields=obj_kind;.cgifields=obj_group;.cgifields=obj_numbered;.cgifields=com_orbit_class&query=1&c_sort=BhA Jet Propulsion Laboratory 15 November 2015 Bin Yang David Jewitt September 2010 Identification of Magnetite in B-type Asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2010AJ....140..692Y The Astronomical Journal 140 3 692–698 2010AJ....140..692Y 10.1088/0004-6256/140/3/692 1006.5110 724871 28 December 2016 6 Joseph R. Masiero T. Grav A. K. Mainzer C. R. Nugent J. M. Bauer R. Stevenson S. Sonnett August 2014 Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M The Astrophysical Journal 791 2 11 2014ApJ...791..121M 10.1088/0004-637X/791/2/121 1406.6645 119293330 28 December 2016 1615 28 December 2016 E. F. Tedesco P. V. Noah M. Noah S. D. Price October 2004 IRAS Minor Planet Survey V6.0 https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0 2004PDSS...12.....T 17 October 2019 6 A. Mainzer T. Grav J. Masiero E. Hand J. Bauer D. Tholen R. S. McMillan T. Spahr R. M. Cutri E. Wright J. Watkins W. Mo C. Maleszewski November 2011 NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results The Astrophysical Journal 741 2 25 2011ApJ...741...90M 10.1088/0004-637X/741/2/90 1109.6407 35447010 6 Joseph R. Masiero A. K. Mainzer T. Grav J. M. Bauer R. M. Cutri C. Nugent M. S. Cabrera November 2012 Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M The Astrophysical Journal Letters 759 1 5 2012ApJ...759L...8M 10.1088/2041-8205/759/1/L8 1209.5794 46350317 28 December 2016 6 V. Alí-Lagoa J. de León J. Licandro M. Delbó H. Campins N. Pinilla-Alonso M. S. Kelley June 2013 Physical properties of B-type asteroids from WISE data http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013A&A...554A..71A Astronomy and Astrophysics 554 16 2013A&A...554A..71A 10.1051/0004-6361/201220680 1303.5487 119214002 28 December 2016 6 V. Alí-Lagoa J. Licandro R. Gil-Hutton Cañ M. ada-Assandri M. Delbo' J. de León H. Campins N. Pinilla-Alonso M. S. P. Kelley J. Hanus June 2016 Differences between the Pallas collisional family and similarly sized B-type asteroids Astronomy and Astrophysics 591 11 2016A&A...591A..14A 10.1051/0004-6361/201527660 free 11336/63614 free 6 C. R. Nugent A. Mainzer J. Bauer R. M. Cutri E. A. Kramer T. Grav J. Masiero S. Sonnett E. L. Wright September 2016 NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos The Astronomical Journal 152 3 12 2016AJ....152...63N 10.3847/0004-6256/152/3/63 1606.08923 free External links Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) Dictionary of Minor Planet Names, Google books Asteroids and comets rotation curves, CdR https://web.archive.org/web/20241208174218/http://obswww.unige.ch/~behrend/page_cou.html 8 December 2024 – Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 1615 1614 Goldschmidt 1615 1616 Filipoff 001615 001615 Category:Named minor planets 001615 19500128