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RA: 13h 20m 52.68s
Dec: +57° 38′ 31.4″
Con: Ursa Major
Ch: MSA:557, U2:48, SA:2
Ref: SIMBAD, Corwin (2004)
Type: galaxy (low surface brightness), S
Mag: B=13.6, V=?
Size: 1.737′ x 0.457′
NGC 5109 = NGC 5113. Both objects were found by William Herschel, N5109 = H II 826 on 17 March 1790, and N5113 = H III 808 eleven months earlier on 24 April 1789. His descriptions are very nearly the same: "F, S, E" and "cF, S, E." John Herschel lists only one galaxy here (h1588) which he identifies as H II 826 (= N5109), in spite of the fact that his father's position for N5109 is a full minute of time and nearly two arcmin off, while that for N5113 is only 10 seconds of time and just over one arcmin off. Sir John's description "vF, pmE, 30sec" is also closer to his father's "cF" for N5113 than it is to the "F" for N5109. Dreyer followed Sir John's lead here, but added a note to the NGC description: "perhaps = N5109." He reinforced this in his 1912 MN paper and collection of Sir William's papers, and suggested that the number N5113 be discarded. Reinmuth agreed, and accepted the equality of the two numbers.
CGCG, however, located a small galaxy six arcmin north of the NGC position for N5113, and assigned the number to that galaxy. UGC followed along. Given the data above, and the fact that this galaxy is 1.6 magnitudes fainter than the brighter one, this identification is certainly incorrect. So, I have followed Dreyer (1912) in equating the two NGC numbers.
Synonyms: H II-826, III-808
Recorded in 1790 by William Herschel as II-826 with an 18.7-inch f/13 speculum telescope. He called it "F, S, E." On April 24, 1789, he recorded III-808 as "cF, S, E." The Notes to the 1820 'Catalogue of 500 Additional New Nebulae and Clusters of Stars' read "Is no doubt identical with II.826, both observed once only and in different sweeps."
The RNGC (Sulentic and Tifft 1973) notes that this is a 13.5 mag galaxy. Their coded description reads EL,BM,HISB.
The Messier objects
The Bennett objects
The Caldwell list
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