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Type: planetary nebula
Mag: B=?, V=?
NGC 7048. There are several stars and faint knots "in" the interior of this planetary. Most of the stars are only optical companions along our line of sight to the nebula. One, however -- clearly seen on the DSS2B image and no other -- is the central star. I've adopted the position of this star. Just east of this on the DSS2R image is a tight group of faint knots; the star has disappeared from this R-band image.
The RNGC (Sulentic and Tifft 1973) notes that this is a 11.5 mag planetary nebula.
by Jim Lucyk: Deep Sky Monthly 9/80 p9.
writes: "Work south from Barnard 361 to the 8th mag star just east of the nebula. Right away I could make out a vague glow barely north-northwest of a little Y-shaped asterism. I couldn't see any real structure in this 1' gas bubble, but try using very high powers. Its circular edges are quite well defined [in photographs]."
(e-mail: email@example.com, web: http://www.west.net/~jbc/); Instrument: 8-inch Dobsonian reflector Location: Carpinteria, CA, USA; Light pollution: light Transparency: good Seeing: fair; Time: Wed Jul 2 08:40:00 1997 UT Obs. no.: 183
I decided to go for a fainter planetary; Burnham's lists this one at mag 11, dimensions 60" x 50". At 49x a fleeting, irregular glow was visible in the area of three field stars. At 122x, averted vision showed what I thought was nebulosity surrounding those three stars, plus an oblong patch extending to the north. I recorded in my notes that there was definitely _something_ there, but that it didn't look much like a planetary. Checking the Palomar Sky Survey print on the Web at STScI, though, I could see what was really going on: There was indeed an oval planetary north of the three field stars, as well as several fainter stars surrounding them, leading me to combine the two limit-of-visibility phenomena into one big, faint patch.
Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "11M; 1' x 0.8' extent; faint, large and a little irregular; N-filter helps."
POSS: br (m8?) * ~3'.5 SW. Y-shaped *ism SE from neb as per PK photo.
m11 * 2'.5 NNE.
PK: *s SSE (two), N, NE edge. br parts on E--->SE, W.
15cm - fairly f puff @ 80x w/m10.5 * on SSE edge. UHC gives mod enhancement, [OIII] is mod-strong. 140x: circ, 50" diam, just touching br * SSE. no cen brtning or cen *, uniformly br except vf *ing on W edge. BS, 17Jun1991, Anderson Mesa.
25cm - lg & mod br @ 180x. seems annular. 1' diam. threshold *s on SE & W. * to W may be spot in neb. m10 * on SE. N is m12 *. small Y-shaped *ism SE from m10 *. neb trails N to m12 *.
30cm - 238x: easy, elong N-S w/m11.5 * on N. in neb on W & NE are threshold *s. W edge brtr and moer sharply def.
The Messier objects
The Bennett objects
The Caldwell list
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