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The Herschel Double Star Object Listings
Last Updated:   15-Dec-12
Sir William Herschel (1738 - 1822 ), his sister Caroline  (1750-1848), and his son Sir John Herschel (1792 - 1871) are credited with the discovery and documentation of roughly 2518 objects in the night sky, now known as the Herschel Objects, to include the famous Herschel 400 Observing List, the H2 Observing List. In his “classifications” system, no reference to the term “Galaxy” was made. Today, we know that roughly 75% of the Herschel objects are indeed “Galaxies”. But to them, they appeared as “Nebulae”. In addition to his DSO discoveries as outlined above, Herschel was very busy with Double Stars as well. He discovered and documented over 800 (827 minus Dups and Non-Documented objects) of them, and catagorized them into the groups as shown below.  During 1821, he discovered a number of additional objects, which were grouped in “Catalogue N”, a collection of various seperations. Bruce MacEvoy has documented his “restoration” of the Herschel Double Star List of the over 800 objects at his website:   My spreedsheets linked below are based upon his work. Herschel I am currently working on Classses IV, V, VI, Double Star Classifications: and “N” which are wider than 15 ArcSec Seperation. 1782 / 1784: Herschel Double Star Excel Spreedsheet  Last 200 Observations Shows Common Names, WDS Numbers, and  Class I “Most Difficult” (096) Flamsteed/Bayer Designations. Links to the objects. Class II Less than 5” Sep (102) Class III 5” to 15” Sep (107) Class IV 15” to 30” Sep (128) Class V  30” to 60” Sep (131)   Class VI > 60” Sep (112)   1821: Cataloue N - all Classes (129)  
Sir William      Caroline           Sir John
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