jwaldo
Smart Mime
Reged: 04/26/04
Posts: 3489
Loc: SoCal
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Last night I was viewing M42, it was definitely bright green, with some flashes of brown or dark red at times.
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-Jim
DHQ 8"
C102 w/ upgraded focuser
ZenithStar 66 ED Triplet
DSH 6"
Transporter 70
Sears 60/900mm
10x50's & assorted other binos
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Anonymous
Unregistered
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M42 is a slate green color in my eye, and very subtle at that. I only get the color after several minutes at the eyepeice.
I do get hints of color in globulars, but they are fleeting and my just be eye strain 
I haven't seen any colors in galaxies at all.
boyd
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markf
Carpal Tunnel
Reged: 10/13/04
Posts: 1935
Loc: Houston, TX
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I saw M42 the first time last thursday. Found by accident while scanning Orion with binocs. Through them it was bluish. ONce I put the scope on it, it was greenish tint. Can't wait to get back out there and try to find other nebulas! 
Mark
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Celestron C6N on a CG5-GT
Orion 80mm Refractor (guidescope)
ToUCam Pro II
Canon Digital Rebel
http://www.carsandfish.com/astroweb
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Daniel Mounsey
Vendor
Reged: 06/12/02
Posts: 2591
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You can see color in objects if you have a big enough scope but that's not being practical. In Steve Kennedy's 24" and 28" dobs, numerous planetary nebulas are in color. You just need enough light to stimulate the cones in your eyes. If you read "Seeing In the Dark" by Timothy Ferris, he describes the Tarantula nebula at the eyepiece in a huge observatory scope and said it was brick red. But like I said before, under most viewing you rarely see color, so it just depends.
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Dave Mitsky
Postmaster
Reged: 04/08/02
Posts: 5012
Loc: Pennsylvania, USA
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Here's a list of colorful nebulae from the Starrynights Yahoogroup.
Name Const. R.A. Dec. mv Notes
NGC 7662 And 23 25.9 +42° 33' 8.3 Blue Snowball
NGC 7009 Aqr 21 04.2 -11° 22' 8.3 Saturn Nebula
NGC 40 Cep 00 13.0 +72° 31' 12.4 .
M27 Vul 19 59.6 +22° 43' 7.3 Dumbbell Nebula
NGC 6826 Cyg 19 44.8 +50° 31' 8.8 Blinking Nebula
NGC 6891 Del 20 15.2 +12° 42' 10.5 .
NGC 6543 Dra 17 58.6 +66° 38' 8.1 Cat's Eye Nebula
NGC 1535 Eri 04 14.3 -12° 44' 9.6 .
NGC 2392 Gem 07 29.2 +20° 55' 7.4 Eskimo Nebula
NGC 6210 Her 16 44.5 +23° 49' 8.8 .
NGC 3242 Hya 10 24.8 +18° 38' 7.8 Ghost of Jupiter
IC 418 Lep 05 27.5 +12° 42' 9.3 Raspberry Nebula
NGC 6369 Oph 17 29.3 -23° 46' 11.4 Little Ghost
NGC 6572 Oph 18 12.1 +06° 51' 9.1 The Emerald Nebula
M42 Ori 05 35.4 -05° 27' 4 The Great Orion Nebula
M8 Sgr 18 03.8 -24° 23' 5.8 Lagoon Nebula
M20 Sgr 18 02.6 -23° 02' 6.3 Trifid Nebula
NGC 6445 Sgr 17 49.3 -20° 01' 11.2 .
NGC 6818 Sgr 19 44.0 -14° 09' 9.3 Little Gem
Dave Mitsky
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Chance favors the prepared mind.
De gustibus non est disputandum.
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BillFerris
Carpal Tunnel
Reged: 07/17/04
Posts: 2435
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Quote:
Here's a list of colorful nebulae from the Starrynights Yahoogroup.
Name Const. R.A. Dec. mv Notes
[snip]
NGC 6826 Cyg 19 44.8 +50° 31' 8.8 Blinking Nebula
[snip]
I recently had an interesting experience with NGC 6826. The view in the new 18-inch Obsession was quite unexpected. I've seen the blinking effect, where the nebula is visible with averted vision but disappears as the the central star switches on under direct scrutiny, many times in smaller scopes. In the 18-inch, there is more of a dissolving effect. Both the central star and nebula are visible with averted vision. With direct vision, both are initially visible and the nebula dissolves away over the course of a second or two.
It's similar to blowing a puff of air to fog a window and watching as the condensations evaporates from the outside-in. I was reminded of the scenes in LOTR where Frodo dissappears after putting on the ring.
Regards,
Bill in Flagstaff
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Grand Canyon Adventure
Lowering the Threshold
18" Obsession
4.5" Meade 4500
10x50 Swift Audubon
Cosmic Voyage
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Barry Fernelius
professor emeritus
Reged: 01/28/04
Posts: 602
Loc: Rancho Santa Margarita, Califo...
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Dave Mitsky's post included:
Quote:
Name Const. R.A. Dec. mv Notes
NGC 7662 And 23 25.9 +42° 33' 8.3 Blue Snowball
...
M27 Vul 19 59.6 +22° 43' 7.3 Dumbbell Nebula
...
M42 Ori 05 35.4 -05° 27' 4 The Great Orion Nebula
M8 Sgr 18 03.8 -24° 23' 5.8 Lagoon Nebula
M20 Sgr 18 02.6 -23° 02' 6.3 Trifid Nebula
Just a few random comments. I definitely have seen the pretty blue color in NGC 7662. I see color in M42 and M8 as well.
Unless I have access to a rather large aperture instrument, I can't see color in M20 or M27 at all!
As always, your mileage may vary...
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The real voyage of discovery consists not in seeking new landscapes, but in having new eyes. -Proust
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Dave Mitsky
Postmaster
Reged: 04/08/02
Posts: 5012
Loc: Pennsylvania, USA
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Quote:
Quote:
Here's a list of colorful nebulae from the Starrynights Yahoogroup.
Name Const. R.A. Dec. mv Notes
[snip]
NGC 6826 Cyg 19 44.8 +50° 31' 8.8 Blinking Nebula
[snip]
I recently had an interesting experience with NGC 6826. The view in the new 18-inch Obsession was quite unexpected. I've seen the blinking effect, where the nebula is visible with averted vision but disappears as the the central star switches on under direct scrutiny, many times in smaller scopes. In the 18-inch, there is more of a dissolving effect. Both the central star and nebula are visible with averted vision. With direct vision, both are initially visible and the nebula dissolves away over the course of a second or two.
It's similar to blowing a puff of air to fog a window and watching as the condensations evaporates from the outside-in. I was reminded of the scenes in LOTR where Frodo dissappears after putting on the ring.
Regards,
Bill in Flagstaff
Bill,
I've noted the same phenomenon with NGC 6826 and several other planetaries that "blink".
Dave Mitsky
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Chance favors the prepared mind.
De gustibus non est disputandum.
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Anonymous
Unregistered
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it may be the blink is located on the other end of the observation continueum. In other words, the photonic destination may have a periodic obscuration rather than the point of origin 
boyd
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dlapoint
sage
Reged: 08/18/03
Posts: 300
Loc: Moncton NB Canada
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I see color in many dso's, but you need to be careful. Are you really seeing the color of the neb, or transfering the color of near by stars. In m42 for example, many back ground stars have nebulosity around them. Are you seeing the color of the gas? Or the star?
Often times late at night our ep's fog up, this spreads color as well. To judge the color of a dso move the scope around, try to get it away from near by colorful stars. Try looking on different nights and when the object is higher in the sky.
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Antares 127 F6.5
Orion 80 ED
Orion XT8
C4.5
Naglers 16mm T5, 9mm T6
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Starman1
Postmaster
Reged: 06/24/03
Posts: 10186
Loc: Los Angeles
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I have seen the peach/rose colors in the outer sections of M42 with a 90mm scope on a particularly dark, clear night.
The greenish tint is usually seen in the brighter center under the same conditions. But the distinct red hues of the nebular arcs on either side of the Trapezium area I had never seen until recently through a 28" scope. It is amazing to me how much color M42 has when the aperture is large enough and the night is dark enough. Wow!
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Don Pensack
12.5" Truss Dob, 5" Maksutov
Sustaining Lifetime IDA member, TeleVue junkie
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Scott Beith
SRF
Reged: 11/26/03
Posts: 29752
Loc: Gulfport, MS
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I have seen M-42 as VERY green in my CR150 from a dark site. No other color (except greyish hues).
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  Scott
TMB 130SS/Atlas (IT'S HERE - THANKS ASTRONOMICS!)
SV102V/CG-5(AS-GT)
SV Nighthawk/Telepod
SV Nighthawk with Coronado SM40/BF10
Oberwerks 8x42 and 11x56
Coronado Binomite II
"The only thing necessary for the triumph of evil is for good men to do nothing." Edmund Burke.
"The measure of a man's life is not what he accomplishes for himself, but what he accomplishes for others." Some bald guy.
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fxxm747
professor emeritus
Reged: 05/26/04
Posts: 654
Loc: Milwaukie, Oregon
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First time I looked at the Veil was through an 18" Obsession in very dark skies (watch your step) with an O3 filter. It was clearly red, soooooo cool!
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* Jim *
80mm f15 Refractor
Meade Research Grade 8" Newt
Meade Starfinder 10" EQ
Homemade 12.5" Fork Mount Newt
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sixela
Postmaster
Reged: 12/23/04
Posts: 8967
Loc: Boechout, Belgium
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Colour me (pun intended) puzzled - given that an OIII filter is designed to let through only a very narrow band of visible light that is definitely *not* red...
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400mm f/4.46 David Lukehurst truss Dobsonian on Tom Osypowski equatorial platform
Orion Starblast (114mm f/4 reflector, Alt/Az)
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David Knisely
Postmaster
Reged: 04/19/04
Posts: 5974
Loc: Beatrice, Nebraska
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Quote:
Colour me (pun intended) puzzled - given that an OIII filter is designed to let through only a very narrow band of visible light that is definitely *not* red...
Well, we might need a bit of history here. "In the beginning...." (oops...sorry, went back too far), Lumicon created the OIII filter to see if it could improve on the performance of its UHC design. The early versions were the single passband design (bluish-green transmission of only the OIII lines), and they worked pretty well. However, as production rolled on over a few years, for some reason, a change occurred (probably to make production easier). A broad red "leak" passband appeared in the newer OIIIs, which also allowed me to see some reds in bright objects like M42. For most observer's, the red response of their eyes is almost nil, so the red passband didn't really hurt anything anyway. One night, a friend of mine and I were observing together with our two filters when M42 rose up over the eastern horizon. We turned our scopes towards it, and in my friend's OIII, we saw no hint of red, while in my filter, the reds were faintly but plainly visible (both in 10 inch Newtonians). This puzzled us until we held up our filters to a red light and discovered the difference (ie: his older filter had no red transmission). We contacted Jack Marling at Lumicon and he wanted both filters back for inspection. I recommended that he leave the red passband in, and for a number of years, that is what happened. However, Jack sold the company, it eventually went under, and has now re-emerged as a division of Parks. The current OIII filter in the 2" model appears to now no longer have the red "leak" passband, as the one I bought recently shows no sign of it in my spectroscope. So, those with the *really old* or *really new* filters probably won't see red through the Lumicon OIII filter. Clear skies to you.
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David W. Knisely
Hyde Memorial Observatory
http://www.hydeobservatory.info
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Astroguy
super member
Reged: 11/19/04
Posts: 312
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I've seen green on many occassions when viewing M42 through a 4.5" reflector without a Nebula filter. When under darker skies... mag 5.5 - 6, I've picked up on some purplish-pinks along with the green. I was very excited on the three occassions that I saw such amazing color through a small aperture scope. I found the green to be very distinct, and the purplish-pinks to be more subtle, but definitely there. A friend of mine also picked up on the same aray of color  , though are perception in regard to what shade of green and purplish-pink was somewhat different. We did see similar colors in the same exact regions of the orion nebula.  "J"
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Meade EQ/4500 4.5" f/8 Reflector(1995)
Orion EQ-2/Short-Tube 90mm Achro Refractor(2001)
Orion SVP-EQ/120mm f/8.3 Achro Refractor(2006)
Kant: To Be is To Do
Neitzsche: To Do is To Be
Sinatra: Do Be Do Be Do
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fxxm747
professor emeritus
Reged: 05/26/04
Posts: 654
Loc: Milwaukie, Oregon
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Well, all I can tell you is I know what I saw through the guys scope. As I recall there was some blue-green as well but almost the whole thing looked red. This was the first time I'd looked through a big scope and it was my first star party before I got hooked on this hobby. I don't have any specialty filters so I can't say anything about them. Could I have "imagined" it? I was so awestruck when I saw it maybe so  Outside of used anybody know the least expensive ones to get and where (outside of AM or course)? 
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* Jim *
80mm f15 Refractor
Meade Research Grade 8" Newt
Meade Starfinder 10" EQ
Homemade 12.5" Fork Mount Newt
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fxxm747
professor emeritus
Reged: 05/26/04
Posts: 654
Loc: Milwaukie, Oregon
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I want one of those middle year Lumicon O3's!!!!!
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* Jim *
80mm f15 Refractor
Meade Research Grade 8" Newt
Meade Starfinder 10" EQ
Homemade 12.5" Fork Mount Newt
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fxxm747
professor emeritus
Reged: 05/26/04
Posts: 654
Loc: Milwaukie, Oregon
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This is slightly off topic,,,please forgive. I had never heard we have poor red response (assume meant as when dark adapted) so I did some surfing. I came across an article that was very interesting. If this article is correct we're all running around with our red flashlights degrading our dark adaptation every time we turn one on. Read and see! No pun intended Also to see red it appears you need to look directly at what you looking at. The center of your retina is all red cones. Interesting read.
oops...forgot the link  http://www.stlplaces.com/night_vision.html
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* Jim *
80mm f15 Refractor
Meade Research Grade 8" Newt
Meade Starfinder 10" EQ
Homemade 12.5" Fork Mount Newt
Edited by fxxm747 (01/05/05 07:40 AM)
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sixela
Postmaster
Reged: 12/23/04
Posts: 8967
Loc: Boechout, Belgium
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Quote:
I want one of those middle year Lumicon O3's!!!!!
Well, the Astronomik UHC (bought by me in Germany, but given the dollar rate actually cheaper from OPT these days! I guess that price won't stay the same once they run out of stock...) has an H-alpha passband - no leak, but a specific band for H-alpha passthrough.
So has the Baader "UHC-S", but that's a bit of a misnomer -- the pass band around OIII/H-beta on the Baader is closer to that of a broadband filter than all other "UHC" filters from others.
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400mm f/4.46 David Lukehurst truss Dobsonian on Tom Osypowski equatorial platform
Orion Starblast (114mm f/4 reflector, Alt/Az)
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