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RA: 00h 45m 32s
Dec: −73° 04′ 48″
Ch: MSA:502, U2:460, SA:24
Ref: SIMBAD, Skiff20080430-HGCjr
Type: emission object
Mag: B=?, V=?
Discovered by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "faint, large, round; very gradually brighter in the middle; 2' across. Here begins a starry region of the Nubecula Minor." The second observation reads: "pretty bright, pretty large, oval, resolvable, 2' diameter." The last observation recorded it as "faint, round, 30 arcseconds." Herschel notes that this entry could refer to either Dunlop 19 or Dunlop 20.
Henize (Catalogues of Hydrogen Alpha Emission Stars and Nebulae in the Magellanic Clouds, Astrophysical Journal Supplement 2, 1956, p315) notes that his nebula LH N 115-12B is "NGC 249 and Nail 18." The nebula measures 2.1' x 1.7', appears round with slightly irregular edges, and shows considerable structural detail.
The RNGC (Sulentic and Tifft 1973) notes that this is a diffuse nebula in the SMC.
15cm - mod f vsm neb cl @ 80x. neb is circ & well-def w/UHC, not so good with
[OIII], 1'.2 diam. 140x: circ rel unconcen cl w/sev *s m14+. BS,
11x80: 1997-10-09, 02:30, Jonkershoek, seeing 3, transparency 3, darkness 3 "Not found."
The Messier objects
The Bennett objects
The Caldwell list
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