Maybe, if the observer's eye was sensitive enough (otherwise, probably not). I have only seen the typical bluish-green color in my 10 inch (but 36 inches is a lot of aperture).
The maps of OIII and Ha emissions shows that the ratio Ha/OIII is greater at the centre than in the outer shell. The fringe is greener than the centre. So: if one sees geen the centre it must cannot see the fringe reddish regardless how much sensitive he is to red (the first red he should see should be at the centre).
It depends on the spectral sensitivity of the observer. Most of the observations I have read on NGC 1535 do not mention red at all (bluish, bluish-green, or even gray). One mentions that the outer edge looks a bit "coppery" in color.
Quote:
The theory that observed colors are necessarily real is dead.
Well, it is dead to you, but not to those who have observed the reds. There is no definitive proof that these colors are illusionary despite all you have provided.
Quote: This, besides the ears of M27, is a proof of false color percetion at a relatively high brightness.
No, again, this is not "proof". You have misread a number of the postings here and distorted what was said.
Quote:
What hiopes remain? IC418 is much redder, so if real red is see that should happen there. Let us see if it is visible in Halpha. As for M42, the brightness levels where red is seen are similar to those of rthe above false colors. Unfortunately those regions are red so we cannot discriminate between false color perception and real perception based on the perceived color. But we only have to wait the ha test.
There is no need to "hope". IC 418 *does* appear red on the edges, and this is well documented as you have been told more than once by a number of people. Also, the "H-alpha test" was done for you by me (and others) using a variety of filter combinations to rule out a contrast effect. Red was seen in parts of M42 when a narrowband filter with H-alpha and OIII/H-Beta passband was used and was not seen when a filter that had only the OIII/H-Beta passband was used. Red was seen when an H-Beta line filter with a high red transmission secondary passband was used on M42 but not when an OIII filter *without* any red transmission was used. This is clear evidence that the red is not a contrast effect, as the red vanished when the filters without any red transmission were used. Why can't you understand this? Although it can be difficult to do, it is definitely *possible* to see reddish hues in M42, M8, IC 418, and Campbell's Hydrogen Star. It is your contention that it is not possible which is "dead".
Previous
Index
Next
Flat
Re: Is it possible to see the nebula with colour?
Edit
Reply
Quote
