Starship Asterisk*

starsurfer wrote: ↑Sat Sep 29, 2018 1:44 pm

Ann wrote: ↑Thu Sep 27, 2018 8:57 pm

starsurfer wrote: ↑Thu Sep 27, 2018 3:32 pm
For some reason both M101 and M33 are called the Pinwheel Galaxy, I've always used it to refer to M101.

Just like NGC 55 and NGC 4631 are both called the Whale galaxy.

Ann

I have never heard NGC 55 called the Whale Galaxy? I do know that somewhere there is a Sacred Mushroom Galaxy.
I just love astronomical names.

Wikipedia wrote:

NGC 55, also occasionally referred to as The Whale Galaxy, is a Magellanic type barred spiral galaxy located about 7 million light-years away in the constellation Sculptor.

Ann wrote: ↑Thu Sep 27, 2018 8:57 pm

starsurfer wrote: ↑Thu Sep 27, 2018 3:32 pm

jisles wrote: ↑Thu Sep 27, 2018 1:55 pm Surely the Pinwheel Galaxy is M101, not M33. https://en.wikipedia.org/wiki/Pinwheel_Galaxy

For some reason both M101 and M33 are called the Pinwheel Galaxy, I've always used it to refer to M101.

Just like NGC 55 and NGC 4631 are both called the Whale galaxy.

Ann

starsurfer wrote: ↑Thu Sep 27, 2018 3:32 pm

jisles wrote: ↑Thu Sep 27, 2018 1:55 pm Surely the Pinwheel Galaxy is M101, not M33. https://en.wikipedia.org/wiki/Pinwheel_Galaxy

For some reason both M101 and M33 are called the Pinwheel Galaxy, I've always used it to refer to M101.

jisles wrote: ↑Thu Sep 27, 2018 1:55 pm Surely the Pinwheel Galaxy is M101, not M33. https://en.wikipedia.org/wiki/Pinwheel_Galaxy

starsurfer wrote: ↑Thu Sep 27, 2018 12:47 pm

Ann wrote: ↑Thu Sep 27, 2018 4:52 am Nice picture!

In my amateur opinion, not a lot of Hα has been used for this image, if any at all. It could be a pure RGB+L image, where none of the colors have been "exaggerated". This gives us an excellent opportunity to judge the overall colors and perhaps also the "true brightness" of the different parts of this galaxy.

We can immediately see that there are two really bright pink regions of star formation in this galaxy, one of which, NGC 604, is really particularly bright. We can also see that the central region, while yellowish, is not strikingly yellow and not very bright. We can also see that there appears to be a small and relatively faint core somewhere in the central region (I wouldn't call it a bulge). We can see that there is an intermediate population in the inter-arm regions which is neither really yellowish nor really blue. And there are numerous bright blue arms in the arms, stars that stand out so clearly that we could probably count them all if we wanted to. Indeed, this picture is so sharp that we can almost count the stars everywhere except in the yellowish center.

Very nice picture!

Ann

From looking at too many astroimages for too many years, I can confidently say this is LRGB.

jisles wrote: ↑Thu Sep 27, 2018 1:55 pm Surely the Pinwheel Galaxy is M101, not M33. https://en.wikipedia.org/wiki/Pinwheel_Galaxy

Ann wrote: ↑Thu Sep 27, 2018 4:52 am Nice picture!

In my amateur opinion, not a lot of Hα has been used for this image, if any at all. It could be a pure RGB+L image, where none of the colors have been "exaggerated". This gives us an excellent opportunity to judge the overall colors and perhaps also the "true brightness" of the different parts of this galaxy.

We can immediately see that there are two really bright pink regions of star formation in this galaxy, one of which, NGC 604, is really particularly bright. We can also see that the central region, while yellowish, is not strikingly yellow and not very bright. We can also see that there appears to be a small and relatively faint core somewhere in the central region (I wouldn't call it a bulge). We can see that there is an intermediate population in the inter-arm regions which is neither really yellowish nor really blue. And there are numerous bright blue arms in the arms, stars that stand out so clearly that we could probably count them all if we wanted to. Indeed, this picture is so sharp that we can almost count the stars everywhere except in the yellowish center.

Very nice picture!

Ann