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Article #4756

Earliest known Deep Sky objects; Ptolemy's cluster M7

#4756
From: Hartmut Frommert
Date: Tue, 04 Jul 1995 00:00
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According to the Guinness Book of Stars, the first known Deep Sky 
objects were:

1. The Pleiades (M45), known since pre-historic times
2. 3 objects mentioned by Ptolemy 138 A.D.:
   1. M44       (NGC 2632, Praesaepe); mentioned before by
        Hipparcus about 130 B.C., according to Kenneth Glyn Jones
   2. M7        "Nebula, following the sting of Scorpius"
   3. h+chi Per (NGC 869/884, the Double Cluster)
      I propose to adopt the name "Ptolemy's Cluster" for M7, as 
      M44 and the double cluster have already other names, and M44 
      was mentioned by Hipparcus before.

What appears strange to me is that they all did not mention the Orion
nebula before N. Peiresc's 1610, besides Ptolemy's notion of a star.
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From: phfrom@nyx.uni-konstanz.de (Hartmut Frommert)
Subject: Earliest known Deep Sky objects; Ptolemy's cluster M7
Date: 1995/07/04
Message-ID: <phfrom.1076.0@nyx.uni-konstanz.de>
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references: <phfrom.1072.0@nyx.uni-konstanz.de> <phfrom.1073.0@nyx.uni-konstanz.de> <phfrom.1074.0@nyx.uni-konstanz.de> <phfrom.1075.0@nyx.uni-konstanz.de>
organization: University of Constance, Dept. of Physics
newsgroups: sci.astro,sci.astro.amateur,fido.ger.astronomie,zer.z-netz.wissenschaft.astronomie.allgem