www.g-vo.org ag herbsttagung 2009 – e-science splinter meeting tools and applications – potsdam,...
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www.g-vo.org AG Herbsttagung 2009 – e-Science Splinter MeetingTools and Applications – Potsdam, 24.9.2009
Digitising Digitising Historical AstronomicalHistorical Astronomical
DataDataIliya Nickelt (AIP/GAVO), Markus Demleitner (ZAH/GAVO)Iliya Nickelt (AIP/GAVO), Markus Demleitner (ZAH/GAVO)
Milcho Tsvetkov, Katya Tsvetkova (Bulgarian Academy of Sciences)Milcho Tsvetkov, Katya Tsvetkova (Bulgarian Academy of Sciences)Harry Enke, Petra Böhm (AIP)Harry Enke, Petra Böhm (AIP)
www.g-vo.org AG Herbsttagung 2009 – e-Science Splinter MeetingTools and Applications – Potsdam, 24.9.2009
Carte du Ciel – a historic project
• first all sky photographic survey• initiated 1887 by A. Mouchez, Obs. Paris• 35 cm refractor (Henry), 2’x2’ plate• observed stars of >14th m, “Astrographic
Catalogue” (AC): all stars down to 11th m (~5-6 min exp)
• main work carried out 1895-1920
www.g-vo.org AG Herbsttagung 2009 – e-Science Splinter MeetingTools and Applications – Potsdam, 24.9.2009
Contributions by Observatory
Hyderabad north ; 149,000
Uccle ; 117,000
Oxford 2 ; 117,000
Oxford 1 ; 277,000
Paris ; 253,000
Bordeaux ; 224,000
Toulouse ; 270,000
Algiers ; 200,000Tacuba ; 312,000
Hyderabad south ; 293,000
Cordoba ; 309,000
Perth ; 229,000
Perth/Edinburgh ; 139,000
Cape Town ; 540,000
Sydney ; 430,000
Melbourne ; 218,000
Potsdam ; 108,000
Vatican ; 256,000
San Fernando ; 225,000
Greenwich ; 179,000Catania ; 163,000
Helsingfors ; 159,000
Total: 5,167,000 Stars
www.g-vo.org AG Herbsttagung 2009 – e-Science Splinter MeetingTools and Applications – Potsdam, 24.9.2009
Potsdam participation• “Potsdam Zone”: 32°-39° = 1232 areas• Observations started 1893• ~400 plates observed and reduced by about 20
observers and computers until 1899• During and after wartime, observation were
carried on by 4 observers, 1913 to 1924• ~1000 Plates were never reduced• In 1932, the IAU decided to pass on the work for
the zone to Oxford and Hyderabad• 2006-2009: Scanning of the remaining plates• 2009: VO publication
ComputerComputer
www.g-vo.org AG Herbsttagung 2009 – e-Science Splinter MeetingTools and Applications – Potsdam, 24.9.2009
Digitisation
• Off the shelf flatbed scanner, 2400 dpi• FITS, TIFF, JPEG• Log book snapshots • About 12 PM of work• Financed by DFG project 436 BUL 113/110 -
Bulgarian academy of sciences, see also AN 330, No. 8, 840 ff. (2009) DOI 10.1002/asna.200911245
www.g-vo.org AG Herbsttagung 2009 – e-Science Splinter MeetingTools and Applications – Potsdam, 24.9.2009
www.g-vo.org AG Herbsttagung 2009 – e-Science Splinter MeetingTools and Applications – Potsdam, 24.9.2009
Metadata
• Collect as much meta data as possible, redundancy
• Due to project history, different people involved, errors, software: meta data must be homogenised
• Of 977 plates, 955 (98%) exist as scans and 948 (97%) are published
www.g-vo.org AG Herbsttagung 2009 – e-Science Splinter MeetingTools and Applications – Potsdam, 24.9.2009
Publication
• Storage on a grid connected web server, mirror at the GAVO DC
• “Homepage” (http://vo.aip.de/plates) with complete listing and descriptions
• Search interface and VO connection via GAVO DC
www.g-vo.org AG Herbsttagung 2009 – e-Science Splinter MeetingTools and Applications – Potsdam, 24.9.2009
GAVO Data center
• Project description for registry entry• Metadata extraction• Astrometric determination via
astrometry.net• GAVO DC publication infrastructure
delivers registration, cone search, image cutouts for SIAP, etc.
• Total: About 3 PMs of work
www.g-vo.org AG Herbsttagung 2009 – e-Science Splinter MeetingTools and Applications – Potsdam, 24.9.2009
Example
www.g-vo.org AG Herbsttagung 2009 – e-Science Splinter MeetingTools and Applications – Potsdam, 24.9.2009
Scientific results?
Frost, E. B., ApJ 12, 297 (1900)
• Precision: ~1’’ ?• Photometry not impossible, re-scanning suggested• Multiple exposures make automatic extraction
difficult• However, historic material may still be useful for
special cases• … if data is detectable by VO• A centralised approach (Europe?) is preferrable