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Thread: NGC 2403 a spiral galaxy in Camelopardalis

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    Default NGC 2403 a spiral galaxy in Camelopardalis



    This is a new galaxy for me and is the first for galaxy season. It is quite charming and very colorful in my mind. It is also rather dim with a surface brightness of 23.37 mag/arcsec^2. (Compare that to 22.80 for a another familiar target, M33). I've include a plate-solve of the area too.

    This is my first outing of the year with the SCT. Alignment went very well and focus was about as close as I think possible. The remote MOTOFOCUS worked very well, though it is not an autofocus.

    Integration of 6 x 300s subs taken with the Atik 383L OSC
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    Galaxy-NGC-2403.binsum_ST.jpg2464223.jpeg

    Galaxy-NGC-2403.binsum_ST by John Pombrio, on Flickr
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    Default Re: NGC 2403 a spiral galaxy in Camelopardalis

    Nice grab, John! This is a rather large galaxy (compared to most of the dim bulbs I go for), and I too am reminded of M33, albeit from a visual standpoint. I've logged this one three times.

    My last log entry from 26 Feb 2016...

    4. NGC 2403 - Spiral Galaxy in Camelopardalis - 20:32:47 - 3rd visit to this galaxy, and first since last spring. Just stopped by this big ol' honker while I was in the area. Rather face-on-ish, at 84x the almost stellar core of this galaxy is bracketed by two stars. At 138x I can pretend that I can barely make out a bit of mottling. Otherwise, an extended and diffuse round glowy patch, reminiscent of M33 only much smaller. Mag 8.35, SB 14.60 mag/arcmin².

    Loooooow surface brightness.
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    Default Re: NGC 2403 a spiral galaxy in Camelopardalis

    Very nice capture John
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    Default Re: NGC 2403 a spiral galaxy in Camelopardalis

    Very nicely done John, great capture.
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    Default Re: NGC 2403 a spiral galaxy in Camelopardalis

    Very nice John.
    Thank you for posting.
    Clear skies.
    Peter.


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    Default Re: NGC 2403 a spiral galaxy in Camelopardalis

    It was fun reading your report. The surface brightness was calculated using arcsec^2 in my case. This is the same scale that the normal visual magnitude is on and helps the user understand how difficult it is to view. The higher the number, the dimmer the image (on a log scale).

    Quote Originally Posted by bladekeeper View Post
    Nice grab, John! This is a rather large galaxy (compared to most of the dim bulbs I go for), and I too am reminded of M33, albeit from a visual standpoint. I've logged this one three times.

    My last log entry from 26 Feb 2016...

    4. NGC 2403 - Spiral Galaxy in Camelopardalis - 20:32:47 - 3rd visit to this galaxy, and first since last spring. Just stopped by this big ol' honker while I was in the area. Rather face-on-ish, at 84x the almost stellar core of this galaxy is bracketed by two stars. At 138x I can pretend that I can barely make out a bit of mottling. Otherwise, an extended and diffuse round glowy patch, reminiscent of M33 only much smaller. Mag 8.35, SB 14.60 mag/arcmin².

    Loooooow surface brightness.
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    Default Re: NGC 2403 a spiral galaxy in Camelopardalis

    Quote Originally Posted by JohnP_1 View Post
    It was fun reading your report. The surface brightness calulated using arcsec^2 in my case. This is the same scale that the normal visual magnitude is on and helps the user understand how difficult it is to view. The higher the number, the dimmer the image (on a log scale).
    Nice image of a fine galaxy John. We certainly agree that the magnitude scale is logarithmic using the constant of Pogson's Ratio or about 2.512, and that the calculation of surface brightness in both mag/arcsec2 and mag/arcmin2 utilizes this constant.

    However, I tend to diverge with the thinking that SBr expressed in terms of mag/arcsec2 is more easily digested by the majority of observers. I think Bryan's use of mag/arcmin2 is easier for most to wrap their heads around when looking at them side by side with visual magnitudes. I've lost count of the number of posts by observers at various sites who were left scratching their heads when looking at the data for a galaxy that utilized mag/arcsec2. Of course all one need do to get themselves down to mag/arcmin2 is to subtract 8.89 from the larger number (or rounded to 8.9). Or add that number to go the other direction.

    To that end I also keep my records in terms of mag/arcmin2. That certainly is not for my own comfort as I understand exactly what you are saying, but more to allow others with perhaps less experience who might read my reports to more easily grasp the direct relationship between magnitude and SBr. In the end we of course each utilize the system that we find more comforting for our own use.
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    Default Re: NGC 2403 a spiral galaxy in Camelopardalis

    That's a nice capture and a great way to start the G-season.

    Joe
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    Default Re: NGC 2403 a spiral galaxy in Camelopardalis

    Thanks. I use what I've learned in Roger Clark's book Visual Astronomy of the Deep Sky, https://books.google.com/books?id=gC...htness&f=false. I defer to your experience on what is more practical to use visually. I usually compare to calculated surface brightness for objects that I've attempted to both image and view visually.

    I was attempting to point out that the higher the surface brightness, the dimmer the object.

    Quote Originally Posted by KT4HX View Post
    Nice image of a fine galaxy John. We certainly agree that the magnitude scale is logarithmic using the constant of Pogson's Ratio or about 2.512, and that the calculation of surface brightness in both mag/arcsec2 and mag/arcmin2 utilizes this constant.

    However, I tend to diverge with the thinking that SBr expressed in terms of mag/arcsec2 is more easily digested by the majority of observers. I think Bryan's use of mag/arcmin2 is easier for most to wrap their heads around when looking at them side by side with visual magnitudes. I've lost count of the number of posts by observers at various sites who were left scratching their heads when looking at the data for a galaxy that utilized mag/arcsec2. Of course all one need do to get themselves down to mag/arcmin2 is to subtract 8.89 from the larger number (or rounded to 8.9). Or add that number to go the other direction.

    To that end I also keep my records in terms of mag/arcmin2. That certainly is not for my own comfort as I understand exactly what you are saying, but more to allow others with perhaps less experience who might read my reports to more easily grasp the direct relationship between magnitude and SBr. In the end we of course each utilize the system that we find more comforting for our own use.
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    Default Re: NGC 2403 a spiral galaxy in Camelopardalis

    Nice capture John.
    I have not looked at this galaxy before.
    Thanks for highlighting it.
    Its nice to see "new" galaxies

    Thanks for sharing.
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