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The History of the Webb Society Double Star Section Bob Argyle

The History of the Webb Society Double Star Section Bob Argyle. 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

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The History of the Webb Society Double Star Section Bob Argyle

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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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  21. 2nd Pro-Am Meeting, Barcelona

  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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  43. 2nd Pro-Am Meeting, Barcelona

  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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