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Type: galaxy, Sc
Mag: B=11.98, V=11
Size: 4.466′ x 2.041′
Discovered by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "a star 12th mag, perfectly sharp in the centre of a very dilute, very gradually fading atmosphere, pmE, 1.5' long, 40 arcseconds broad. A very remarkable specimen of its class."
This 12.3 mag spiral galaxy is recorded in the NGC as "remarkable, very faint, pretty much elongated, extremely suddenly very much brighter in the middle like a 12th mag. star".
In 1902 R.T.A. Innes of the Royal Observatory, Cape of Good Hope, wrote: "As seen with the 7-inch [refractor]. This is a fine nebulous star".
[1902MNRAS..62..468L Notes on Nebulae observed at the Royal Observatory, Cape of Good Hope]
vF, 2.5'x1', E 130deg, oval or a compact spiral, with a B stell.N.
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).
The galaxy measures 2.4' x 2' in PA 127 .
The RNGC (Sulentic and Tifft 1973) notes that this is a 12.0 mag galaxy. Their coded description reads SLEL,VDIF,BM,STELNUC.
Included in the CCD-atlas of Ryder S.D. & Dopita M.A. (1993) "An H-alpha Atlas of Nearby Southern Spiral Galaxies" Astrophys.J.Suppl. 88, 415. They note: "The nuclear region of NGC 5530 appears unusually bright owing to the near superposition of a 13th mag field star."
16-inch f/10 SCT (127x, 290x, 462x)
Very soft elongated haze NW-SE which is estimated in length 4'. Very prominent star like nucleus. The star field is scattered with faint stars and it seems to be a few splinter stars involved.
Instrument:12-inch Dobsonian Reflector Telescope.
Eyepieces:26mm Super Wide Field Eyepiece.
20mm Ultra Wide Angle Eyepiece.
Sky Conditions:Whole Milky Way is visible.
Transparency of the Sky:The sky is clean.
Seeing:Atmosphere stable with little interference.
Limiting Magnitude:Magnitude 6.
First Impression:This object looks like a faint smudge of light.
Chart Number:No.17(Extract taken out of "Atlas of the Night Sky").
Size:26mm Eyepiece:Field Of View:57'/14=4.0'.
20mm Eyepiece:Field Of View:50'/13=3.8'.
Size in Arc Minutes:3.9'.
Brightness Profile:The whole of this galaxy is very faint but grows slightly brighter in the nucleus.
Challenge Rating:Very Difficult.
This galaxy looks like a faint smudge of light.No spiral structure is observed.The galactic nucleus is somewhat oval and well defined and observed as an extremely faint oval glow.On the other hand there are some darker areas within this galaxy.
The Messier objects
The Bennett objects
The Caldwell list
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