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RA: 11h 28m 36.21s
Dec: −52° 56′ 4″
Ch: MSA:976, U2:427, SA:25
Type: planetary nebula
Mag: B=13.1, V=?
A photographic survey of bright southern planetary nebulae. M.N.R.A.S., 110(5), 429-439.
Positive prints show an image precisely like the face of a circus clown, but a negative is more revealing… [further discussion, photo]
PK 290+ 7 1 = E170-PN06 (~N3702)
QBS: big & br w/br cen *. sl wkr on E side of annulus. m~14 cen * dead center, nrly sym nebula. m13.5 * at 39" pa60.
15cm - br, lg, easy to see @ 80x, m10.5; surprising it's not an NGC/IC object.
140x/195x: 35"-40" diam, circ, but fades out on E side, and much brtr on W side. m13.5-14 cen * or sup * seen consistently, but seems off-center to N side. m13.5 * ENE, neb reaches at least two-thirds way to *. UHC enhancement strong, [OIII] vstrong. BS, 23Feb1990, LCO.
Included in the discussion of NGC 3918 in "Neat Southern Planetaries - II", by Andrew James:
"SA2-75 (WRAY16-91, HE2-66, PK290+7.1) (11287-5256) lies 5.3° NW of NGC 3918 or 1.8° NE of Pi Centauri. At magnitude 11.6p this planetary is surprisingly bright. The diameter is some 16.0"sec.arc. The type is classed as '3+4' - Irregular Disk with a Ring structure. It is recommended to use an O-III filter to find it. A 20cm. or 25cm. is required to see this object with it's nebulosity. A 10.5cm. could possibly see it with an O-III. The western side of the nebulosity is slightly brighter."
The Messier objects
The Bennett objects
The Caldwell list
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