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RA: 19h 05m 55.56s
Dec: −05° 59′ 32.9″
Ch: MSA:1317, U2:296, SA:16
Type: planetary nebula
Mag: B=15.78, V=15.48
This 12.5 magnitude planetary nebula is described in the NGC as "pretty bright, small."
Burnham calls it "annular."
The RNGC (Sulentic and Tifft 1973) notes that this is a 12.0 mag planetary nebula.
Photo Index by Jim Lucyk: Deep Sky #3 Su83 p22, Deep Sky #15 Su86 p17, Deep Sky #20 Fa87 p12.
Observer: Scott Hogsten; Your skills: Intermediate (some years); Date/time of observation: Aug 19, 1998 00:05 EDT; Location of site: Perkins Observatory, Delaware OH (Lat , Elev ); Site classification: Suburban; Sky darkness: 5.5 Limiting magnitude; Seeing: 7 1-10 Seeing Scale (10 best); Moon presence: None - moon not in sky; Instrument: 12.5" F5 Dob; Magnification: 120x, 150x; Data: mag 11.9 size 20"; Position: RA 19:05 DEC -06:00
Description: Small dim planetary, very ghost like and difficult to see due to sky glow. The object gave hints of detail at 150x and appeared as an irregular oval. Averted vision was necessary to keep this planetary from blinking out of view.
Hartung notes "in a field sprinkled with stars is a greyish rather diffuse disk of luminous haze about 20 arcsec across, with no visible central star. 15cm will show it."
Notes that this planetary is about 20 arcseconds in diameter and easy to find in a 10-inch telescope.
Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "12M; 20" diameter; small, fuzzy-edged disc with 13M center star; 14M stars on each side E-W; use >200x and N-filter; 30' to NW is red type-N6 variable star V AQL (Period = 353 days; 6.6->8.4M)."
Steve Coe, using a 13" f/5.6, notes: "Pretty large, bright, somewhat elongated, greenish at 135X. A very nice planetary that will show off its' central star at 270X. Using the 13" I see the central star as about 12th mag, also there is a star of similar magnitude on the eastern edge, seen at 220X. This is on a night I rated 8/10 for seeing and 9/10 for transparency in the central Arizona mountains. On that very nice evening, this object appeared to me as one of the best objects in Aquila."
Steve Coe, in "SACNEWS On-line for September 1996", observing with a 13-inch, notes: NGC 6751 is a very nice planetary nebula at 19 hr 05.9 and -06 00. In the 13" it is pretty large, bright, somewhat elongated, and greenish at 135X. This is on a night I rated 8/10 for seeing and 9/10 for transparency in the central Arizona mountains. On that very nice evening, this object appeared to me as one of the best objects in Aquila. There are two stars of about 12th magnitude embedded within this bright planetary, one in the center and one on the eastern edge, both can be seen at 220X.
POSS: see fld sketch on card.
15cm - found @ 60x. br * W. *ar even light. a garland of f *s SE. HM, Roof.
- fairly br, vis @ 62x. 190x: cen * barely vis w/m13.5 * 20" E, same mag as
cen *. BS, 3Sep1981, Anderson Mesa.
- sm grey puff easy to spot @ 80x. 165x: m13.5 * on E side, neb reaches
two-thirds distance to *. fntr pair(?) farther ESE. m13-13.5 * on W. neb
circ w/cen brtning but cen * not obvious. BS, 11Jun1988, Anderson Mesa.
25cm - sm ,mod br. cen * vis. two *s on E edge, one on W edge. inner * on E
brtst. some features. HM notes poss annularity. BS & HM, Roof.
- 190x: 20" diam, gradually brtr to center where cen * is clr. circ, no
features. BS, 3Sep1981, Anderson Mesa.
30cm - hisfcbr. cen * easy @ 476x. E 1' and W 1'.5 are m12 *s. one or two dk
spots on S. broad core fades evenly, smoothly. CBL, Roof.
Instrument:12-inch Dobsonian Reflector Telescope.
Sky Conditions:The fainter parts of the Milky Way are barely visible with the naked eye.
Transparency Of The Sky:Haziness only visible on the horizon.
Seeing:Atmosphere stable with little interference.
Object Type:Planetary Nebula.
First Impression:This object looks like a planetary nebula.
Chart Number:No.12(Extract taken out of "Atlas of the Night Sky").
Size:9mm Eyepiece:Field Of View:15'/14=1'.
7mm Eyepiece:Field Of View:15'/13=1.1'.
Size In Arc Minutes:1'.
Planetary Nebula is 1'* 0.5'.
Brightness Profile:The central nucleus of this planetary nebula is bright all over.
Challenge Rating:Very Difficult.
This planetary nebula is both seen at 167* and 214* as a relatively small round halo of soft light and is seen as a pale greenish blur of light which is well defined.
The Messier objects
The Bennett objects
The Caldwell list
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