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{{Short description|Astronomical star catalogue}}
{{italic title}}
{{Infobox astronomical survey|alt_names=|namedafter=[[Henry Draper]]}}
The '''''Henry Draper Catalogue''''' ('''HD''') is an [[Astronomy|astronomical]] [[star catalogue]] published between 1918 and 1924, giving [[spectroscopic]] [[stellar classification|classifications]] for 225,300 stars; it was later expanded by the '''''Henry Draper Extension''''' ('''HDE'''), published between 1925 and 1936, which gave classifications for 46,850 more stars, and by the '''''Henry Draper Extension Charts''''' ('''HDEC'''), published from 1937 to 1949 in the form of charts, which gave classifications for 86,933 more stars. In all, 359,083 stars were classified as of August 2017.<ref name=Nesterov>{{Cite journal |last1=Nesterov |first1=V. V. |last2=Kuzmin |first2=A. V. |last3=Ashimbaeva |first3=N. T. |last4=Volchkov |first4=A. A. |last5=Röser |first5=S. |last6=Bastian |first6=U. |year=1995 |title=The Henry Draper Extension Charts: A catalogue of accurate positions, proper motions, magnitudes and spectral types of 86933 stars |journal=Astronomy and Astrophysics Supplement Series |volume=110 |pages=367 |bibcode=1995A&AS..110..367N |id=[[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://cdsarc.u-strasbg.fr/viz-bin/Cat?III/182 III/182]}}</ref><ref name=hde />

The HD catalogue is named after [[Henry Draper]], an amateur astronomer, and covers the entire sky almost completely down to an apparent [[photographic magnitude]] of about 9; the extensions added fainter stars in certain areas of the sky.<ref name=Bell>{{cite web |year=1996 |title=HD (S0): HENRY DRAPER star catalog, edition 1985 (19930406) |url=http://www.willbell.com/software/hypersky/hd.htm |work=HyperSky |publisher=Willmann-Bell, Inc. |archive-url=https://web.archive.org/web/20080509145504/http://www.willbell.com/software/hypersky/hd.htm |archive-date=May 9, 2008 }}</ref> The construction of the ''Henry Draper Catalogue'' was part of a pioneering effort to classify stellar spectra, and its catalogue numbers are commonly used as a way of identifying stars.<ref name=webb /><ref name=galaxies />

==History==
The origin of the ''Henry Draper Catalogue'' dates back to the earliest photographic studies of stellar spectra. [[Henry Draper]] made the first photograph of a star's [[spectrum]] showing distinct [[spectral lines]] when he photographed [[Vega]] in 1872. He took over a hundred more photographs of stellar spectra before his death in 1882. In 1885, [[Edward Charles Pickering|Edward Pickering]] began to supervise photographic spectroscopy at [[Harvard College Observatory]], using the [[objective prism]] method. In 1886, Draper's widow, [[Mary Anna Palmer Draper]], became interested in Pickering's research and agreed to fund it under the name Henry Draper Memorial.<ref>{{cite journal |title=On the Henry Draper Memorial Photographs of Stellar Spectra |last=Barker |first=George F. |year=1887 |url=https://books.google.com/books?id=KcAAAAAAYAAJ |journal=Proceedings of the American Philosophical Society |volume=24 |pages=166–172}}</ref><ref>{{cite book |last=Ogilvie |first=Marilyn Bailey |year=1986 |title=Women in Science: Antiquity Through the Nineteenth Century: a Biographical Dictionary with Annotated Bibliography |url=https://archive.org/details/womeninscience00mari |url-access=registration |page=[https://archive.org/details/womeninscience00mari/page/75 75] |publisher=MIT Press |isbn=978-0-262-65038-0}}</ref> Pickering and his coworkers then began to take an objective-prism survey of the sky and to classify the resulting spectra.<ref>{{Cite journal |bibcode = 1915JRASC...9..203C|title = The Henry Draper Memorial|journal = Journal of the Royal Astronomical Society of Canada|volume = 9|pages = 203|last1 = Cannon|first1 = Annie J.|year = 1915}}</ref>

{| class="wikitable" style="float: right"
|+ Classifications in the Draper Catalogue of Stellar Spectra<ref name=drclass>{{harvnb|Hearnshaw|1986|p=108}}; {{harvnb|Pickering|1890|pp=2–4}}</ref>
|-
! Secchi || Draper || Comment
|-
| I
| A, B, C, D
| Hydrogen lines dominant.
|-
| II
| E, F, G, H, I, J, K, L
|
|-
| III
| M
|
|-
| IV
| N || Did not appear in the catalogue.
|-
| &mdash;
| O || Wolf–Rayet spectra with bright lines.
|-
| &mdash;
| P || Planetary nebulae.
|-
| &mdash;
| Q || Other spectra.
|}
A first result of this work was the ''Draper Catalogue of Stellar Spectra'', published in 1890. This catalogue contained spectroscopic classifications for 10,351 stars, mostly north of [[declination]] −25°. Most of the classification was done by [[Williamina Fleming]].<ref>{{cite journal|bibcode = 1890AnHar..27....1P|title = The Draper Catalogue of stellar spectra photographed with the 8-inch Bache telescope as a part of the Henry Draper memorial|journal = Annals of Harvard College Observatory|volume = 27|pages = 1–388|last1 = Pickering|first1 = Edward C.|year = 1890}} See in particular pp. 1–2.</ref> The classification scheme used was to subdivide the previously used [[Secchi classes]] (I to IV) into more specific classes, given letters from A to N. Also, the letter O was used for stars whose spectra consisted mainly of bright lines, the letter P for [[Planetary nebula|planetary nebulae]], and the letter Q for spectra not fitting into any of the classes A through P. No star of type N appeared in the catalogue, and the only star of type O was the [[Wolf–Rayet star]] [[HR 2583]].<ref name=drclass />

[[Antonia Maury]] and Pickering published a more detailed study of the spectra of bright stars in the northern hemisphere in 1897.<ref>{{Cite journal |bibcode = 1897AnHar..28....1M|title = Spectra of bright stars photographed with the 11-inch Draper Telescope as part of the Henry Draper Memorial|journal = Annals of Harvard College Observatory|volume = 28|pages = 1|last1 = Maury|first1 = Antonia C.|last2 = Pickering|first2 = Edward C.|year = 1897}}</ref> Maury used classifications numbered from I to XXII; groups I to XX corresponded to subdivisions of the Draper Catalogue types B, A, F, G, K, and M, while XXI and XXII corresponded to the Draper Catalogue types N and O.<ref>{{harvnb|Maury|Pickering|1897|loc=Table I}}</ref> She was the first to place B stars in their current position, prior to A stars, in the spectral classification.<ref>{{harvnb|Hearnshaw|1986|p=112}}</ref>

In 1890, the Harvard College Observatory constructed the [[Boyden Observatory]] in [[Arequipa]], [[Peru]] in order to study the sky in the [[Southern Hemisphere]], and a study of bright stars in the southern hemisphere was published by [[Annie Jump Cannon]] and Pickering in 1901.<ref>{{Cite journal |bibcode = 1901AnHar..28..129C|title = Spectra of bright southern stars photographed with the 13-inch Boyden telescope as part of the Henry Draper Memorial|journal = Annals of Harvard College Observatory|volume = 28|pages = 129|last1 = Cannon|first1 = Annie J.|last2 = Pickering|first2 = Edward C.|year = 1901}}</ref><ref>{{harvnb|Hearnshaw|1986|pp=110–111, 117–118}}</ref> Cannon used the lettered types of the ''Draper Catalogue of Stellar Spectra'', but dropped all letters except O, B, A, F, G, K, and M, used in that order, as well as P for planetary nebulae and Q for some peculiar spectra. She also used types such as B5A for stars halfway between types B and A, F2G for stars one-fifth of the way from F to G, and so forth.<ref>{{harvnb|Hearnshaw|1986|pp=117–119}}</ref>

Between 1910 and 1915, new discoveries increased interest in stellar classification, and work on the ''Henry Draper Catalogue'' itself started in 1911. From 1912 to 1915, Cannon and her coworkers classified spectra at the rate of approximately 5,000 per month.<ref>{{harvnb|Cannon|1915|pp=214–215}}</ref> The catalogue was published in 9 volumes of the ''Annals of Harvard College Observatory'' between 1918 and 1924. It contains rough positions, magnitudes, spectral classifications, and, where possible, cross-references to the [[Durchmusterung]] catalogs for 225,300 stars.<ref>{{cite journal |last=Cannon |first=Annie J. |last2=Pickering |first2=Edward C. |year=1918 |title=The Henry Draper Catalogue |journal=Annals of Harvard College Observatory}};<br />hours 0 to 3, '''91''' (1918), {{bibcode|1918AnHar..91....1C}};<br />hours 4 to 6, '''92''' (1918), {{bibcode|1918AnHar..92....1C}};<br />hours 7 to 8, '''93''' (1919), {{bibcode|1919AnHar..93....1C}};<br />hours 9 to 11, '''94''' (1919), {{bibcode|1919AnHar..94....1C}};<br />hours 12 to 14, '''95''' (1920), {{bibcode|1920AnHar..95....1C}};<br />hours 15 to 16, '''96''' (1921), {{bibcode|1921AnHar..96....1C}};<br />hours 17 to 18, '''97''' (1922), {{bibcode|1922AnHar..97....1C}};<br />hours 19 to 20, '''98''' (1923), {{bibcode|1923AnHar..98....1C}};<br />hours 21 to 23, '''99''' (1924), {{bibcode|1924AnHar..99....1C}}.</ref> The classification scheme used was similar to that used in Cannon's 1901 work, except that types such as B, A, B5A, F2G, and so on, had been changed to B0, A0, B5, F2, and so on. As well as the classes O through M, P was used for nebulae and R and N for [[carbon star]]s.<ref>{{harvnb|Hearnshaw|1986|pp=121–122, 128, 133–134}}; also see {{harvnb|Cannon|Pickering|1918|loc=vol.&nbsp;1, pp.&nbsp;5–11}}</ref>

Pickering died on February 3, 1919, leaving 6 volumes to be overseen by Cannon.<ref>{{cite book |last=Hearnshaw |first=J. B. |year=1986 |title=The Analysis of Starlight: One Hundred and Fifty Years of Astronomical Spectroscopy |url=https://archive.org/details/analysisofstarli0000hear |url-access=registration |page=[https://archive.org/details/analysisofstarli0000hear/page/135 135] |publisher=Cambridge University Press |isbn=978-0-521-25548-6}}</ref> Cannon found spectral classifications for 46,850 fainter stars in selected regions of the sky in the ''Henry Draper Extension'', published in six parts between 1925 and 1936.<ref name=hde>{{Cite journal |bibcode = 1936AnHar.100....1C|title = The Henry Draper extension|journal = Annals of Harvard College Observatory|volume = 100|pages = 1|last1 = Cannon|first1 = Annie. J.|year = 1936}}</ref><ref>{{Cite journal |bibcode = 1937AnHar.105....1C|title = The Henry Draper charts of stellar spectra|journal = Annals of Harvard College Observatory|volume = 105|issue = 1|pages = 1|last1 = Cannon|first1 = Annie Jump|last2 = Shapley|first2 = Harlow|year = 1937}}</ref> She continued classifying stars until her death in 1941. Most of these classifications were published in 1949 in the ''Henry Draper Extension Charts'' (the first portion of these charts was published in 1937.) These charts also contained some classifications by Margaret Walton Mayall, who supervised the work after Cannon's death.<ref>{{harvnb|Cannon|Shapley|1937}}; {{harvnb|Hearnshaw|1986|p=138}}</ref><ref>{{Cite journal |bibcode = 1949AnHar.112....1C|title = The Henry Draper extension. II|journal = Annals of Harvard College Observatory|volume = 112|pages = 1|last1 = Cannon|first1 = Annie J.|last2 = Mayall|first2 = Margaret Walton|year = 1949}}</ref>

The catalogue and its extensions were the first large-scale attempt to catalogue [[spectral type]]s of stars,<ref name=galaxies>{{cite book |last=Sparke |first=Linda S. |author-link=Linda Sparke|last2=Gallagher |first2=John S. III |year=2007 |title=Galaxies in the Universe: An Introduction |url=https://archive.org/details/galaxiesuniverse00spar |url-access=limited |page=[https://archive.org/details/galaxiesuniverse00spar/page/n15 4] |publisher=Cambridge University Press |isbn=978-0-521-85593-8 |edition=2nd}}</ref> and its construction led to the [[Harvard classification]] scheme of stellar spectra which is still used today.<ref>{{cite book |last=Schulz |first=Norbert S. |year=2005 |title=From Dust to Stars: Studies of the Formation and Early Evolution of Stars |url=https://archive.org/details/fromdusttostarss00schu_155 |url-access=limited |page=[https://archive.org/details/fromdusttostarss00schu_155/page/n26 13] |publisher=Springer |isbn=978-3-540-23711-2}}</ref>

==Availability and usage==
Stars contained in the main portion of the catalogue are of medium [[apparent magnitude|magnitude]], down to about 9<sup>m</sup> (about {{sfrac|1|15}} as bright as the faintest stars visible with the [[naked eye]]). The extensions contain stars as faint as the 11th magnitude selected from certain regions of the sky.<ref name=Bell /><ref>[https://www.britannica.com/EBchecked/topic/92776/Annie-Jump-Cannon Annie Jump Cannon], article, ''Encyclopædia Britannica Online'', accessed September 12, 2008.</ref> Stars in the original catalogue are numbered from 1 to 225300 (prefix ''HD'') and are numbered in order of increasing [[right ascension]] for the [[epoch (astronomy)|epoch]] 1900.0. Stars in the first extension are numbered from 225301 to 272150 (prefix ''HDE''), and stars from the extension charts are numbered from 272151 to 359083 (prefix ''HDEC''). However, as the numbering is continuous throughout the catalog and its extensions, the prefix ''HD'' may be used regardless as its use produces no ambiguity.<ref>See p. 2, Cannon and Shapley 1937 and p. 369, Nesterov et al. 1995.</ref> Many stars are customarily identified by their HD numbers.<ref name=webb>{{cite book |last=Webb |first=Stephen |year=1999 |title=Measuring the Universe: The Cosmological Distance Ladder |page=327 |publisher=Springer |isbn=978-1-85233-106-1}}</ref>

The ''Henry Draper Catalogue'' and the ''Extension'' were available from the [[NASA]] [[Astronomical Data Center]] as part of their third [[CD-ROM]] of [[astronomical catalogues]].<ref>[http://adc.gsfc.nasa.gov/adc/adccdrom3_doc.html Astronomical Data Center CD-ROM: Selected Astronomical Catalogs, Volume 3] {{webarchive|url=https://web.archive.org/web/20080916100212/http://adc.gsfc.nasa.gov/adc/adccdrom3_doc.html |date=2008-09-16 }}, Astronomical Data Center, [[NASA]]. Accessed on line September 11, 2008.</ref> Currently, the ''Catalogue'' and ''Extension'' are available from the [[VizieR]] service of the [[Centre de Données astronomiques de Strasbourg|Centre de Données astronomiques]] (French for "Astronomical Data Center") at [[Strasbourg]] as catalogue number III/135A.<ref>Henry Draper Catalogue and Extension, A. J. Cannon and E. C. Pickering, [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://cdsarc.u-strasbg.fr/viz-bin/Cat?III/135A III/135A].</ref> Because of their format, putting the ''Henry Draper Extension Charts'' into a machine-readable format was more difficult, but this task was eventually completed by 1995 by Nesterov, Röser and their coworkers, and the charts are now available at [[VizieR]] as catalogue number III/182.<ref name=Nesterov/>

==References==
{{Reflist|colwidth=30em}}

==External links==
The ''Henry Draper Catalogue'' and its extensions are available on line free of charge at the [[VizieR]] service of the [[Centre de Données astronomiques de Strasbourg]]:
* ''Henry Draper Catalogue'' and ''Extension'', A. J. Cannon and E. C. Pickering, [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://cdsarc.u-strasbg.fr/viz-bin/Cat?III/135A III/135A].
* The ''Henry Draper Extension Charts'': A catalogue of accurate positions, proper motions, magnitudes and spectral types of 86933 stars, V. V. Nesterov, A. V. Kuzmin, N. T. Ashimbaeva, A. A. Volchkov, S. Roeser, and U. Bastian, [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://cdsarc.u-strasbg.fr/viz-bin/Cat?III/182 III/182].

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[[Category:Astronomical catalogues of stars]]
[[Category:Henry Draper Catalogue objects| ]]
[[Category:1910s books]]
[[Category:1920s books]]
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[[Category:1940s books]]