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Type: galaxy, S...
Mag: B=13.1, V=12.2
Size: 1.5′ x 1.1′
Synonyms: H II-018, H II-498
In William Herschel's "Catalogue of One Thousand New Nebulae and Clusters of Stars" he observed an object on 23 January 1784 which he called "Faint, small." This object received the number H II-18. Its identity was for some time questionable, as Herschel mistook M49 for M61, thereby causing quite some confusion. Dreyer writes: "The entry in the Register (Sweep 105) is: 'Preceding M. Messier's 61st Nebula and not far from its parallel is a nebulous star or small nebula; its PD must be about 80 degrees 23 minutes. The time of its entrance not being taken leaves it uncertain so some minutes, but probably it is about 12h 15m." He recorded it on a second occasion ( H II-498) on the night of 28 December 1785 as "Faint, pretty large."
The RNGC (Sulentic and Tifft 1973) notes that this is a 13.0 mag galaxy. Their coded description reads R,HISB,SLDIFPERIPH.
Observing site: Pinnacles overlook
[12h 29m 36s, 7° 49m 0s] A faint, but distinct patch. A face on S0? Not in Burnham. NASA extragalactic Database lists it an an Sa(?).
The Messier objects
The Bennett objects
The Caldwell list
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