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Exploring the Legacy of Thomas William Webb and the Webb Society Double Star Section

Discover the life and work of Thomas William Webb (1806-1885), his passion for astronomy, and the formation of the Webb Society Double Star Section in 1968. Learn about the active members, methods of observation, and key figures involved in this astronomical pursuit.

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Exploring the Legacy of Thomas William Webb and the Webb Society Double Star Section

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  1. The History of the Webb Society Double Star SectionBob Argyle 2nd Pro-Am Meeting, Barcelona

  2. Thomas William Webb (1806-1885) Educated by his father Interested in astronomy from age 11 Oxford 1826 – 1830 1832 (MA) Observed Bedford catalogue 1845-50 Moved to Herefordshire 1856 Celestial Objects for Common Telescopes (1859) Died in harness 1885 2nd Pro-Am Meeting, Barcelona

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  8. Formation of the Webb Society`caeli scrutamur plagas’ • From the Night Sky series by John Larard in The Astronomer • Joint proposal with Kenneth Glyn Jones • Society formed 1967 June 12 • First Quarterly Journal Mar 1968 • First AGM Sept 1970 2nd Pro-Am Meeting, Barcelona

  9. 2nd Pro-Am Meeting, Barcelona

  10. Webb Society Double Star Section • Started 1968 • Directors ( J. C. C. Larard 1968 -1970) • (R. W. Argyle 1970 - date) • Circulars – started 1979 • Observing Handbook (1975,1989) • 18 issued to date – now annual 2nd Pro-Am Meeting, Barcelona

  11. Double Star Section Active members : 10 Methods: filar and double image micrometers, CCD cameras, internet astrometry, graticule eyepieces. 18 Circulars 1979 -2010 31,000+ measures 2nd Pro-Am Meeting, Barcelona

  12. Observers • Maurice Duruy (late 1960’s) • Domenico Gellera (1975 – 1996) • Andreas Alzner (2001 – 2010) • Robert Argyle (1990 – 2010) • Ernȍ Berkó (2002 - 2010) 2nd Pro-Am Meeting, Barcelona

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  15. Diffraction grating micrometer (Andreas Maurer 20-cm SCT) 2nd Pro-Am Meeting, Barcelona

  16. Diffraction grating micrometer • Variable pitch instrument (Maurer) 2nd Pro-Am Meeting, Barcelona

  17. Patterns for using the objective grating micrometer 2nd Pro-Am Meeting, Barcelona

  18. Diffraction grating micrometer • K.Schwarzchild 1896 • L.Richardson 1927 • M.V.Duruy 1960’s 2nd Pro-Am Meeting, Barcelona

  19. Maurice Duruy – Alpes Maritimes 2nd Pro-Am Meeting, Barcelona

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  22. 8-inch refractor at Cambridge • Focal length 114 inches • Built in 1864 by Thomas Cooke for W. R Dawes (died 1868) • Bought by W. Thorrowgood who left it to the RAS in 1927 • On permanent loan from the RAS to Cambridge Observatories since 1929 • Used for double star measurements since March 1990 • 6600 mean measures – four PA and three double distance • RETEL micrometer + Barlow x3 = x450 (1 rev =24".9). Threads subtend 0".3. Range of separation 0".4 to 145" 2nd Pro-Am Meeting, Barcelona

  23. The 8-inch Cooke refractor at Cambridge 2nd Pro-Am Meeting, Barcelona

  24. RETEL micrometer 2nd Pro-Am Meeting, Barcelona

  25. RETEL micrometer on 8-inch 2nd Pro-Am Meeting, Barcelona

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  30. Orbital elements for  Vir Element Error  = 255°.034 0°.368  = 35°.356 0°.414 (Eq. 2000.0) i = 149°.414 0°.159 e = 0.8815 0.000182 T = 2005.509 0.00187 P = 169y.101 0y.01096 a = 3.641 0.00750 2nd Pro-Am Meeting, Barcelona

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  37. Domenico Gellera • Lodi, near Milan, Italy • 11-cm Zeiss refractor + filar micrometer • Home-made measuring machine • Pourteau pairs • Luyten common proper motion pairs 2nd Pro-Am Meeting, Barcelona

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  44. Webb SocietyDouble Star Section Circulars1979 - 1998 Issue Date Filar DIM Other CCD 1 1979 - - - - 2 1982 - - ( 505)$ - 3 1984 ( 666)* - - - 4 1989 ( 734)* - ( 50)$ - 5 1992 2021 - - - 6 1996 3018 - (383)$ - 7 1998 1657 - - 182 $ = Measuring machine * = includes some grating micrometer 2nd Pro-Am Meeting, Barcelona

  45. Webb SocietyDouble Star Section Circulars2000 - 2010 Issue Date Filar DIM Other CCD Microguide Internet 8 2000 1217 - - - - - 9 2001 679 - - 25 - - 10 2002 682 - (22)^ 489 15 9 11 2003 642 1152 - 1685 - - 12 2004 433 - - 269 50 3324 13 2005 314 437 - 252 29 1465 14 2006 337 187 - 519 33 68 15 2007 348 - - 320 39 1027 16 2008 377 311 - 371 8 1024 17 2009 215 - - 582 30 108 18 2010 285 - - 892 - 195 ^ = Ring micrometer 2nd Pro-Am Meeting, Barcelona

  46. CircularNo 16 2nd Pro-Am Meeting, Barcelona

  47. USNO 6th orbital catalogue 2nd Pro-Am Meeting, Barcelona

  48. Drift method – Doug West 2nd Pro-Am Meeting, Barcelona

  49. An example of a CCD image (Doug West) 2nd Pro-Am Meeting, Barcelona

  50. Celestron Micro Guide • Basic graticule 2nd Pro-Am Meeting, Barcelona

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