NGC 6572 = PK 34+11.1 = PN G034.6+11.8 = ?6 = Emerald Nebula
18 12 06.3 +06 51 13
V = 8.0; Size 16"x13"
18" (8/2/05): at 225x I noticed an interesting color effect;
although the color was a quite prominent bluish-green, while staring
at the center the planetary decreased in size but the color changed
to a deep emerald green.
18" (8/14/04): at 225x, strikingly bright emerald green oval,
slightly elongated ~N-S, ~15"x12". Increasing to 435x this compact
planetary appears elongated 3:2, ~16"x11" and brightens towards the
center with direct vision, although the color becomes bluish and
washed out. The surface brightness is too high to pick out a central
star. There appears to be small, faint envelope which encases the
18" (7/19/04): at 225x this small planetary is very bright, with an
obvious blue-green color. Generally, the color appeared a vivid
emerald green and other times there was bluish tint to the color.
The main body is only ~8" in size with a thin halo elongated ~SW-NE
increasing the size to roughly 15"x11". It appears to have a much
larger, very low surface brightness halo, though perhaps this is
scattered light as the planetary has such as a high surface brightness.
This halo is still evident at 322x appears ~30" in diameter.
17.5" (6/3/00): at 220x appears as a very bright, small, intense blue
oval, ~15"x12". At 280x-500x, a thin outer envelope is obvious with
the inner oval a uniform high surface brightness. No central star
13" (8/24/84): very bright, small, about 15" diameter, slightly
elongated N-S, extremely high surface brightness, blue color. Very
faint outer halo is elongated N-S. No central star seen.
8" (7/79): bright, small, very high surface brightness.
- by Steve Gottlieb