sponsored by psychohistorian.org
Type: planetary nebula
Mag: B=?, V=12.8
Synonyms: H I-192
Discovered in 1787 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "cB, iF, 3' long, 2.5' broad. Nebulosity."
Ced 186 (NGC 7008)
Position (1900): RA 21 57.6, Dec + 54 10
Star: Anon (Mp=12.:, V=12. :)
Spectrum of nebula: emission spectrum (observed)
Classification: Neb associated with mainly one star (which may be multiple) - Quasi-planetary, representing a transitional type between real planetaries and bright diffuse nebulae (eg. NGC 1514)
Notes: "NGC 7008 = GC 4627 = h 2099 = H I 192. Disc. 1787. WP 156. (103, 114, 174, 208, 216, 481, 520, 549, 578, 603 Pl 46, 631). R. Although Curtis (208) descibes this object as quite irregular, it has also been classified as a planetary."
The RNGC (Sulentic and Tifft 1973) notes that this is a 13.5 mag planetary nebula.
by Jim Lucyk: Deep Sky #7 Su84 p8.
Observer: Eric Honeycutt Your skills: Intermediate (some years) Date/time of observation: 8/10-11; 2300 EDT Location of site: Troutdale, VA (Lat 36, Elev 3500) Site classification: Rural Sky darkness: 7.0+ Limiting magnitude Seeing: 6 10-1 Seeing Scale (1 best) Moon presence: None - moon not in sky Instrument: 22", f/4.1, Dob Magnification: 288x with UHC Filter(s): Object(s): The Fetus Nebula - NGC 7008 Category: Planetary nebula. Class: Constellation: CYG Data: mag 10.7V size 98"x75"
Description: The Fetus Nebula is a Pn that has absolutely striking detail! The fetus shape is very obvious, even at low powers. Central star is an easy direct vision object (13.2v) and is near "abdomen region". The Pn is very large in the 9 Nagler at 288x. 2 medium-brightness stars are also within nebula; one as an "eye" of the fetus and the other at the rear. 2 stars of roughly 11th mag reside on N side of Pn. great object!
Houston notes that this 13th mag planetary is about 1' in diameter and difficult to see. He adds that it has been seen in a 4-inch refractor.
This 13th magnitude planetary nebula is described in the NGC as "conciderably bright, large, elongated in approx PA 45 , mottled appearance, double star involved." An 8-inch shows it as an 86" by 96" oval, fairly bright towards the edges and situated near a few bright stars.
Listed by the Herschel Club, described as "oval shaped, fairly bright towards the edges. Situated by a few bright stars in field. 8-inch, 70x."
(PK93+5.2) Mag=10.7. Cygnus: 21h, 0.6m; +54° 33' We didn't recall looking at this marvelous object before a late- summer 1995 observing session with a professional companion, the chemist Dr. Douglas Hudgins, who was studying the composition of planetaries as part of his astronomical work at Nasa-Ames Research. If this object had been given a nickname with which to attract the fancy of amateur astronomers, it would be a sure- fire favorite! For this wonderful planetary has a remarkable variety of stellar and nebular features, and -- like M-17 -- looks good with just about any aperture amateur scope!
In Hudgins' 17.5" Dobsonian, an asterism of finely-scattered stars, sporting a fine 18" double, opens into a fan-shaped spray of nebulosity that is dramatically bright and well-defined. Despite its length of nearly 100 arcseconds, the surface brightness is high, so the nebula is easily visible in a 3-5 inch aperture scope. Less dramatic in our 8" than in the large Dobsonian, NGC-7008 is nevertheless one of the few deep- sky objects whose eyepiece- views really resemble photographs. Much detail was evident at high magnification, using 200x and an oxygen-nebula filter. Don't miss this one!
Your skill: Intermediate
Date and UT of observation: 08/19/97 0300 GMT
Location & latitude: 22 miles west of Boston, Ma. 42.3N
Site classification: Suburban
Limiting magnitude (visual): 4 (estimated) 4(est) in vicinity of object
Seeing (1 to 10 - worst-best): 5
Moon up (phase?): Yes, full, towards horizon
Instrument: 16",dob-newt 96%, 99% coatings- f/4.59, fl 1865mm-Pegasus
Filters used: OIII, UHC
Although just a splash of light in low power observation, using the UHC filter and 266x, I was able to see, especially with averted vision, an open ring, moderately large in size, with an irregular, clumpy nature. Size was just a bit larger than M57, the ring nebula, but much dimmer. Seemingly open on the south side, where two bright stars trailed away from the planetary. So, it takes on an upside down U appearance.
Note.. the moon was out for this observation, and near full. High power did produce a lot of detail despite this.
Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "12M; 1.4' x 1.2' extent; fairly large, faint oblong with 13M center star."
Aller: * NE 28"; W 44".
WDS: br pair = h1606: 9.3,10.2; 18".4; 186. sep from primary to pn cen * is 54" in pa336.
15cm - mod br lg pn @ 50x w/sev *s inv. filters not greatly effective, although gradual contrast improvement going from DS to UHC to [OIII]. 80x shows m9 * S to have comp. cen * of pn vis here, too, m13.0. m14 * just off W edge of neb, m13.5 * in neb ENE. br oval knot NNE edge. clearly annular w/brtr rim brtr at NE & SW ends, wk on E & W. neb oval 2'x1'.5 elong in pa30. needs drawing. BS, 16June1991, Anderson Mesa.
18cm - Pluto camera guidescope, 180x: losfcbr. cen * is ever so sl brtr than * in NE edge. SE lobe not obvious; NE one is consp however, w/o *ar condens of 25cm. BS, 26Aug1983, Anderson Mesa.
25cm - vstrange. on N side of m8,10.5 pair of 20" sep. at 47x it appears as a cl of four *s assoc w/pair. 180x/240x show m13 cen * w/dk area around it. elong in pa45, 1'.5x1'. 25" NE of center is m14.5 * nr edge but w/in neb. the NE lobe is brtr, containing on its W a vcbr spot, which with inattention looks nrly *ar. this is directly N of cen *. lobes rounded on end; object flattened along maj axis. much detailed object.
30cm - nice. just N of m9 dbl (30"; pa20). obliquely lobed w/lobes not on maj or min axes. 1'.5x1'.2. cen * easy, m13.3. a m14.3 * in neb 30" ENE. NE lobe brtst, 45" across. SE lobe more diffuse. W 1' is m14.5. virreg br, w/much detail. lobes in pa40 and neb has bluish color.
[amastro] posting, Sat Nov 25, 2006
82" telescope, McDonald Observatory near Fort Davis, Texas, USA
f/13.7, 35mm Televue Panoptic (5' fov, 812x)
Sometimes called the Fetus Nebula - spectacular in this telescope. Technically a disk, but there are so many internal bright clumps that your first impression is one of a very complex, non-round object. There are several stars superimposed on this PNe, including the easy CS, and a bright double off the north edge completes the superb picture.
Alldays (22.50S, 20.12E, 770m).
12-inch f/10 SCT (218x)
Very soft but brighter than indicated. The nebula somehow looks elongated NE-SW. With high power there seems to be mollted areas and a few faint stars involved. Moore: Hazy patch surely bigger than M57. Some irregularity or blotchiness within. From NW al around N to NE is bare in field stars. Slightly blue in colour.
The Messier objects
The Bennett objects
The Caldwell list
DOCdb is still in beta-release.
Known issues, feature requests, and updates on bug fixes, are here:
Found a bug? Have a comment or suggestion to improve DOCdb? Please let us know!
DOCdb is a free online resource that exists to promote deep sky observing.
You could help by sharing your observations, writing an article, digitizing and proof-reading historical material, and more.
Everything on DOCdb.net is © 2004-2010 by Auke Slotegraaf, unless stated otherwise or if you can prove you have divine permission to use it. Before using material published here, please consult the Creative Commons Attribution-Non-Commercial-Share Alike 2.5 License. Some material on DOCdb is copyright the individual authors. If in doubt, don't reproduce. And that goes for having children, too. Please note that the recommended browser for DOCdb is Firefox 3.x. You may also get good results with K-Meleon. Good luck if you're using IE. A successful experience with other browsers, including Opera and Safari, may vary.