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Type: planetary nebula
Mag: B=?, V=?
Synonyms: H III-637
Discovered in 1787 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "vF, eS, 300 power shewed 2 vS stars with nebulosity."
The RNGC (Sulentic and Tifft 1973) notes that this is a 13.5 mag planetary nebula.
Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "12M; 25" diameter; soft, small fuzz surrounds 13.5M star visible at high-x; near center of 10'-diameter triangle of 11-12M stars."
Houston notes that this is a very faint object of magnitude 12 some 20 arcseconds across.
Your skills: Intermediate (some years) Sky darkness: 5.2 Limiting magnitude Seeing: 7 1-10 Seeing Scale (10 best) Instrument: Ultima C-8 PEC w/ 80mm f/10 MAK
Small, but not quite stellar. Like an slightly out of focus star. No color. Lies along axis between two of three stars which form a triangle. Easy w/ 21mm Konig at 96x. Unseen with 80mm.
PK: N & S parts brtr.
15cm - like a f *.
- mod f patch @ 50x in a triangle of m10 *s 10' on-a-side, nr SW face.
circ, uniformly br @ 165x w/m14 cen * clearly vis. BS, 29Jun1989,
25cm - 20" diam. cen * clearly vis @ 240x. circ, diffuse, fades gradually to
- cen * clear @ 140x. BS, 23May1982, Anderson Mesa.
30cm - found w/in a triangle of m10 *s. avg brtness for a gx, in fact looking
much as a gx: cen * vis easily in center with neb fading evenly to outer
indef edges. 40" diam, grey.
Observer: Yann POTHIER (France) Your skill: advanced (many years) Object: NGC 6058 (PK 064+48.1; PN G064.6+48.2; ARO 49, VV 76) Category: planetary nebula Constellation: HER Object data: Vmag=12.9; Bmag=13.3; 25"x20" (32"x27" in IDB); type III+II; central star of Vmag=12.8; discovered by Herschel in ????; ELCAT: [OIII, 496+501nm] = 14 x [Hbeta, 486nm]. RA/DE: 16h04.42m, +40°41.0' (2000.0) Date and UT of observation: 17 February 1994, 02h00 UT Location & latitude: La Clapiere Obs. (France, latN44 40 00, longE06 27 36) Site classification: rural, alt.1650m (5500ft) Limiting magnitude (visual in UMi): 6.0 Transparency (1 to 5 - best to worst): 2 Seeing (1 to 5 - best to worst): 3 Moon up (phase?): no Instrument: Coulter 445mm/17.5" F/4.5 Magnification: 125x Filters used: OIII
Description: at 125x, small PN, bright, gradually brighter towards the center, stellar nucleus of mag13.5, overall shape slightly oval (estimated on drawing to be 54"x43") in SSW-NNE axis; better seen with OIII filter but no more internal detail.
Observer: Yann POTHIER (France) Your skill: advanced (many years) Object: NGC 6058 (PK 064+48.1; PN G064.61+48.2; ARO 49, VV 76) Category: planetary nebula Constellation: HER Object data: Vmag=12.9; Bmag=13.3; 25"x20"; type III+II; central star of Vmag=12.8; discovered by Herschel in ????; ELCAT: [OIII, 496+501nm] = 14 x [Hbeta, 486nm]. RA/DE: 16h04.42m, +40°41.0' (2000.0) Date and UT of observation: 17 July 1991, ... Location & latitude: La Clapiere Obs. (France, latN44 40 00, longE06 27 36) Site classification: rural, alt.1650m (5500ft) Limiting magnitude (visual in UMi): 6.0 Transparency (1 to 5 - best to worst): 1 Seeing (1 to 5 - best to worst): ? Moon up (phase?): no Instrument: Japanese Newtonian 4.25"/114mm f/7.8 Magnification: 36-100x Filters used: -
Description: at 36x, practically invisible; at 72x, better seen, small to medium in size, very faint with some faint stars scattered around, especially one of mag12 on hte W side; at 180x, small slighlty brighter core.
Alldays (22.50S, 20.12E, 770m).
12-inch f/10 SCT (218x, 346x)
This planetary displays a small and very faint disc with a hazy outer envelope. It has a pale whitish disc, which seems to be slightly elongated north south. The central star dimly shines at 13.8 magnitude. This planetary form a very distinct Y shape with the surrounding stars in the middle connecting the two bars of the Y. Pale blue in colour.
NGC 6058 / Planetary Nebula / Hercules / 16h 04m 4s / +40 41
Met die 8" Meade en 18mm oogstuk was ek verstom met die Planetary Nebula en omliggende sterre se voorkoms wat 'n duidelike Y patroon gevorm het. Sagte dowwe (ongeveer 12 tot 13 Magnitude) nebula wat ook in 'n buitenste laag wasigheid ontvou. Met 'n veldgroote van 36.2, geen middel ster sigbaar nie skat wel die helderste ster 9 magnitude. Met meer vergroting het die planetary 'n groter waaserigheid ontbloot.
"With the 8-inch Meade and an 18mm eyepiece, I was astonished at the appearance of this planetary nebula and the obvious Y-shaped pattern of the surrounding stars. The planetary is a soft, faint (12-13th magnitude) nebula [[wat ook in 'n buitenste laag wasigheid ontvou ]].
In a 36 arcminute eyepiece field of view, no central star was visible; I estimate the brightest star in the field at 9th magnitude. With higher magnification the planetary is shown as a larger nebulous presence."
Subject: [deepsky] Hercules in the south
Using an 8 inch Schmidt-Cassegrain (focal length 2000mm) telescope and 18mm wide angle eyepiece, I was astonished and surprised at the appearance of this particular nebula with an obvious "Y" shaped configuration of the surrounding stars. The planetary nebula appears soft, rather faint approximately 12 to 13 magnitude, with an outer hazy envelope. It would seem as if the nebula is surrounded by the foggy/smoky envelope. With higher magnification the planetary is shown as a large nebulous presence.
Observing site: Little Bennett Regional Park
Telescope: 18-inch Obsession
[16h 4m 24s, 40° 41m 0s] A small, round patch. 14mv central star seen with averted vision.
The Messier objects
The Bennett objects
The Caldwell list
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