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NGC 5747 (12,637 of 18,816)


oc gc pln bn dn gx gxcl ast aka lost




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NGC 5747

NGC 5747, IC 4493, LEDA 52638, MCG+02-38-002, UGC 9496, III 48, GC 3988

RA: 14h 44m 20.94s
Dec: +12° 07′ 55.1″

Con: Bo÷tes
Ch: MSA:718, U2:198, SA:14


(reference key)

Type: galaxy (in pair), S

Mag: B=14.4, V=?

Size: 0.891′ x 0.776′
PA: 169°

History and Accurate Positions for the NGC/IC Objects (Corwin 2004)

NGC 5747 = IC 4493. WH's single discovery observation is about 50 seconds of time too far east. Bigourdan looked for NGC 5747 at WH's position and of course saw nothing. He did find the object, however, and measured it twice. He included it in his 4th list of new nebulae, so it received a number in the second IC. Herschel's note on the object, quoted by Dreyer in the 1912 reprinting of Herschel's papers, reads, "An extremely faint nebula, it is small and required some time to look at before it could be well seen." This helps to explain the position error, but errors of this size are not unknown in others of WH's observations.

Historical observations

William Herschel (c.1784)

Synonyms: H III-048

Discovered in 1784 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "eF ... an eF neb., it is S and required some time to look at it before it could be well seen." Dreyer notes that it was not found twice by Bigourdan.

Published comments

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 14.5 mag galaxy. Their coded description reads IRR,HISB,FDIF APPS.

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