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Johann Abraham Ihle (14 June 1627 – c.1699) was a German amateur astronomer who discovered the first known globular cluster, M22, on 26 August 1665 while observing Saturn in Sagittarius.
References
- Sharp, N. A., M22, NGC6656, REU program/NOAO/AURA/NSF, retrieved 2006-08-16.
- Kirch, Gottfried (1682) Annus II. Ephemeridum Motuum Coelestium Ad Annum Aerae Christianae M. DC. LXXXII. … Leipzig, (Germany): Heirs of Friedrich Lanckisch. (in Latin) 54 pages. The pages of this book are not numbered. However, in the Appendix, section III. Stella nebulosa prope pedem borealem Ganymedis observata, Lipsia, die 1. Sept. 1681. (III. Nebula near the northern foot of Ganymede observed, Leipzig, 1. September 1681.), first paragraph, Kirch enumerated recently discovered nebulae: " & tertia in Sagittaris, quam Dn. Joh. Abrah. Ihle Anno 1665. deprehendit; " ( and the third in Sagittarius, which Mr. Johann Abraham Ihle discovered in the year 1665; ) Downloadable at: Digitale Sammlungen der Universitäts- und Landesbibliothek Sachsen-Anhalt (Digital collections of the university- and state library of Sachsen-Anhalt)
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