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RA: 19h 55m 2.39s
Dec: +29° 17′ 19.5″
Ch: MSA:1172, U2:119, SA:8
Type: planetary nebula
Mag: B=?, V=16
NGC 6842. Is this possibly NGC 6847 (which see)? Probably not, but it is a possibility.
The RNGC (Sulentic and Tifft 1973) notes that this is a 13.5 mag planetary nebula.
Chopinet, M. & Lortet-Zuckermann, M.C. (1972) A note to designations of planetary nebulae. Astron.Astrophys., 18, 166-167.
NGC 6842: He 2-451, PK 65+0°1, Sh 1-72, Sh 2-95
This planetary nebula on the border between Vulpecula and Cygnus lies just east of the open cluster 6834. Its pale disk is nearly 1' in diameter, but it is only of magnitude 13.6. Houston found it easily with a 8-inch at 100x.
MacRobert writes: "The 13th mag planetary close by [NGC 6834] was totally undetectable in the 6-inch scope from my light-polluted location. A 12-inch will reportedly show it."
POSS: m14.5 * off neb 50" NE; others 1'.1 SE & 1'.8 S.
15cm - vdifficult object! vis w/o filters @ 80x. DS & UHC not effective, but really pops out in [OIII]. circular, uniformly br, w/well-def border, diam 45". m14.5 * on E edge vis @ 140x; two others m13.5 farther SE & S. BS, 12Jul1989, Anderson Mesa.
25cm - not found.
30cm - 238x: vlosfcbr, broad concen. annularity definite, cen * not. S&E are f *s.
The Messier objects
The Bennett objects
The Caldwell list
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