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Type: galaxy, Sc
Mag: B=12, V=11.39
Size: 3.801′ x 2.884′
NGC 7418. Dreyer suggested that this might be IC 5265 (which see), but it is not.
Discovered by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "pB, vL, R, or vlE, vgbM, 4' diam, with left eye resolvable, hardly resolved, PD bad. A fine object." On a second occassion he called it "B, vL, R or vlE, vglbM, 5'." His third observation was recorded as "vF, vL, R, vglbM, 3'."
See Swift's comments on IC 5264.
F, 2' ino diameter, spiral.
F, 2.5'x2.5', spiral with pF alm.stell.N. This is a 'left-hand' spiral with two main branches which are close together on the f. side, and from these proceed a number of smaller subsidiary whisps.
De Vaucouleurs (1956) "Survey of bright galaxies south of -35° declination", Mem. Mount Stromlo, No. 13. (photographic study, plates taken with the 30-inch Reynolds reflector, 20-inch diaphragm).
Shobbrook (1966, Mon. Not. R. astr. Soc., Vol 131, p351-363) notes that this member of the Grus Cluster has V = 11.77, B-V = 0.60 and U-B = -0.05. It measures 3.2 by 2.2.
Shapley, H. & Paraskevopoulos, J.S. (1940) Southern clusters and galaxies. Harvard Obs. Bull., No.914, 6-8.
The RNGC (Sulentic and Tifft 1973) notes that this is a 12.0 mag galaxy. Their coded description reads S,VDIF,LBM,DKLNS, SEV KNS IN CT.
A supernova erupted in this galaxy in 1983 (15.5p)
Sandage (1975(Astrophysical Journal, 202, 563-582) notes that this galaxy is a member of the IC 1459 Grus Group. Members include NGC 7410, NGC 7412, NGC 7418, NGC 7421, NGC 7424, NGC 7496, NGC 7531, NGC 7552, NGC 7582, NGC 7590, NGC 7599, IC 1459, IC 5267, IC 5269 & IC 5273.
Steve Coe, observing with a 13" f/5.6, notes: "Pretty faint, large, round and little brighter in the middle at 100X."
Canterbury: pa130 overall, paE-W in core.
8cm - not vis. BS, 6Sep1983, Anderson Mesa.
15cm - vf. BS, Slate Mtn.
- lg diffuse glow @ 80x. 140x: 3' diam, or 1/3 sep of m10-11 *s NNW & SSW (latter is un= pair). mod broad concen completely w/o zones. * or knot SSW side w/in halo, another vf */*ing nr S edge. BS, 15Nov1993, LCO.
25cm - losfcbr, 2'.5x1' in pa80-100. cigar-shaped w/o cen condens. a few broad br and dk areas w/in it, but pretty smooth overall. 95x. BS, Slate Mtn.
Alldays (22.50S, 20.12E, 770m).
12-inch f/10 SCT (218x, 346x)
Lovely large round glow situated between four block stars which is away more or less 5' to the sides, it resembles the Crux constellation. Very soft to the edges but slightly oval in a NW-SE direction.
The Messier objects
The Bennett objects
The Caldwell list
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