Page 1 of 2 12 LastLast
Results 1 to 10 of 12
Like Tree23Likes

Thread: NGC 2403 a spiral galaxy in Camelopardalis

  1. #1
    JohnP_1's Avatar
    JohnP_1 is offline CMDR, The Eagles Nest
    Points: 57,324, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 19.0%
    Achievements:
    2 Posts Achievement365 Days+ Registered Achievement!20 Posts Achievement!Gallery Achievement!Album Achievement!
    Join Date
    Feb 2014
    Location
    Mystic, CT
    Posts
    4,145
    Points
    57,324
    Level
    100
    Thanks
    2,023
    Thanked 1,640x 1,519 Posts
    Blog Entries
    50
    Downloads
    0
    Uploads
    0

    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
    scope: Celestron C8 SCT w/MOTOFOCUS FR/FF(s): Starizona SCT Corrector

    Galaxy-NGC-2403.binsum_ST.jpg2464223.jpeg

    Galaxy-NGC-2403.binsum_ST by John Pombrio, on Flickr
    The Eagle's Nest - Bortle 4-5 sky - scopes: Celestron C8 SCT w/MOTOFOCUS; ES ED102 APO CF MoonLite w/auto focus! FR/FF(s): Starizona SCT Corrector; Stellarvue 0.8 FR/FF; Explore Scientific 1.0 FF Filters: 1.25 inch - Orion Ha (1.25in), 2 inch - UHC, polarizer, Orion Sky Glow, Astronomik CLS-CCD Mount: Celestron AVX Cameras: Canon 60d (modded); Atik 383L+ OSC Guiding: Olivon OAG; ZWO ASI120MM; QHY QHY5-II Mono

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.

  2. The Following User Says Thank You to JohnP_1 For This Useful Post:

    carter2002 (03-14-2018)

  3. #2
    bladekeeper's Avatar
    bladekeeper is online now Super Moderator
    Points: 269,080, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 99.9%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Awards:
    Activity Award
    Join Date
    Aug 2014
    Location
    Lowell, Arkansas, USA
    Posts
    35,272
    Points
    269,080
    Level
    100
    Thanks
    26,327
    Thanked 15,930x 10,858 Posts
    Downloads
    8
    Uploads
    0

    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.
    BABOafrica likes this.
    Bryan
    Scopes: Apertura AD12 f/5; Celestron C6-R f/8; ES AR127 f/6.4; ES AR127 f/9.4; ES AR102 f/9.8; iOptron MC90 f/13.3; Orion ST80A f/5; Celestron Premium 80 f/11.4; Celestron C80 f/11.4; Meade NG60 f/10
    Mounts: Celestron AVX; Bresser EXOS-2; ES Twilight I; ES Twilight II; iOptron Cube-G; AZ3/wood tripod; Vixen Polaris
    Eyepieces:
    GSO Super Plössl 40mm, 32mm, 15mm, 9mm; ES 82° Series; GSO Superview 30mm; Celestron Plössl 26mm, 20mm; ES 70° 25mm; ES Plössl 25mm; Vite Aspheric 23mm, 10mm, 4mm; Orion Expanse 20mm, 9mm; KK Ortho 18mm, 12.5mm; Bresser 70° 15mm; Coulter Optical 12.5mm; BCO 10mm; ES 62° 9mm; Zhumell Z Series 5mm
    Binoculars: Pentax PCF WP II 10×50, Bresser Corvette 10×50, Bresser Hunter 16×50 and 8×40, Garrett Gemini 12×60 LW, Gordon 10×50, Apogee 20×100
    Observing: Herschel Tallies: H1 = 400/400 H2 =323/400 H3 = 224/300; 3,181 observations of 1,808 objects; Song in my head: The Band - Up On Cripple Creek

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.
    Days since last observing session: 2; Sessions in last 30 days: 13; Last Night's Excuse: Clouds, clouds, and clouds..

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.

  4. The Following User Says Thank You to bladekeeper For This Useful Post:

    JohnP_1 (03-13-2018)

  5. #3
    Gabby76's Avatar
    Gabby76 is offline Super Moderator
    Points: 67,403, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 50.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!Gallery Achievement!Album Achievement!50 Posts Achievement!
    Awards:
    Activity & Post & Thread Master
    Join Date
    Jan 2016
    Location
    Live: Slovakia Work: Canada
    Posts
    15,685
    Points
    67,403
    Level
    100
    Thanks
    2,647
    Thanked 4,940x 4,181 Posts
    Blog Entries
    4
    Downloads
    3
    Uploads
    0

    Default Re: NGC 2403 a spiral galaxy in Camelopardalis

    Very nice capture John
    Refractors: Antares 105 f/15, Bresser 102XL f/13.2, Celestron 102 f/6.5, 2-150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, Vixen SD115s f/7.7
    Mounts: Manfrotto 055PRO, Celestron SLT, Celestron CG-5/ Argo Navis, Vixen SXP Binoculars: Celestron Eyepieces: A-Z

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.

    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
    Ya gotta keep this Apo/Achro thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.

  6. The Following User Says Thank You to Gabby76 For This Useful Post:

    JohnP_1 (03-13-2018)

  7. #4
    ic_1101's Avatar
    ic_1101 is offline Silver Supporters
    Points: 14,325, Level: 82
    Level completed: 50%, Points required for next Level: 175
    Overall activity: 12.0%
    Achievements:
    2 Posts Achievement5 Threads Achievement!20 Posts Achievement!50 Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!
    Join Date
    Sep 2017
    Location
    Hamilton, Ontario, Canada
    Posts
    1,136
    Points
    14,325
    Level
    82
    Thanks
    2,728
    Thanked 375x 355 Posts
    Downloads
    1
    Uploads
    0

    Default Re: NGC 2403 a spiral galaxy in Camelopardalis

    Very nicely done John, great capture.
    ​Alex
    Scope: Stellarvue SVR102T with SV .80 FF/FR & Motorized MoonLite Focuser,
    Mallincam VRC-8 RC with CCDT67 FR & Motorized Moonlite Focuser

    Mount: iOptron CEM60 on tri-pier Cameras: QHY163m, ZWO asi174mm, asi224mc, Altair gp290m, asi120m
    Accessories: Combo Quark, QHYCFW2-M-US, Polemaster Software Pixinsight, Photoshop, StarTools, SGP




  8. The Following User Says Thank You to ic_1101 For This Useful Post:

    JohnP_1 (03-13-2018)

  9. #5
    Peter802's Avatar
    Peter802 is online now HYPER GIANT
    Points: 15,637, Level: 86
    Level completed: 25%, Points required for next Level: 263
    Overall activity: 16.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!365 Days+ Registered Achievement!
    Join Date
    Feb 2016
    Location
    United Kingdom. At present in Germany.
    Posts
    4,000
    Points
    15,637
    Level
    86
    Thanks
    678
    Thanked 1,347x 1,323 Posts
    Blog Entries
    1
    Downloads
    3
    Uploads
    0

    Default Re: NGC 2403 a spiral galaxy in Camelopardalis

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

    Scopes: Bresser AR-127S 635mm. Celestron Travel Scope 70. Mount: Bresser EXOS - 2 modified to belt drive and AstroEQ mount controller.
    Cameras: Un modded Canon 450D.
    Bino's: Nikon Aculon A211. 16x50 4.2 degs.

  10. The Following User Says Thank You to Peter802 For This Useful Post:

    JohnP_1 (03-13-2018)

  11. #6
    JohnP_1's Avatar
    JohnP_1 is offline CMDR, The Eagles Nest
    Points: 57,324, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 19.0%
    Achievements:
    2 Posts Achievement365 Days+ Registered Achievement!20 Posts Achievement!Gallery Achievement!Album Achievement!
    Join Date
    Feb 2014
    Location
    Mystic, CT
    Posts
    4,145
    Points
    57,324
    Level
    100
    Thanks
    2,023
    Thanked 1,640x 1,519 Posts
    Blog Entries
    50
    Downloads
    0
    Uploads
    0

    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.
    bladekeeper likes this.
    The Eagle's Nest - Bortle 4-5 sky - scopes: Celestron C8 SCT w/MOTOFOCUS; ES ED102 APO CF MoonLite w/auto focus! FR/FF(s): Starizona SCT Corrector; Stellarvue 0.8 FR/FF; Explore Scientific 1.0 FF Filters: 1.25 inch - Orion Ha (1.25in), 2 inch - UHC, polarizer, Orion Sky Glow, Astronomik CLS-CCD Mount: Celestron AVX Cameras: Canon 60d (modded); Atik 383L+ OSC Guiding: Olivon OAG; ZWO ASI120MM; QHY QHY5-II Mono

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.

  12. #7
    KT4HX's Avatar
    KT4HX is offline HYPER GIANT
    Points: 90,380, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 45.0%
    Achievements:
    365 Days+ Registered Achievement!First 1000 Experience Points750 Days+ Registered Achievement!1000 Days+ Registered Achievement!200+ Posts Achievement!
    Join Date
    Dec 2008
    Location
    Virginia
    Posts
    10,997
    Points
    90,380
    Level
    100
    Thanks
    1,019
    Thanked 7,365x 4,104 Posts
    Blog Entries
    197
    Downloads
    2
    Uploads
    0

    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.
    Alan || My DSO Blog:
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.

    ---------------------------------------------------------------------------
    Astro Sky 17.5 f/4.5 Dob || Apertura AD12 f/5 Dob || Zhumell Z10 f/4.9 Dob
    ES AR127 f/6.5 and ES ED80 f/6 on Twilight-II Mount
    ES 82° 24mm thru 4.7mm
    ---------------------------------------------------------------------------
    Astronomers: We look into the past to see our future.

  13. The Following User Says Thank You to KT4HX For This Useful Post:

    JohnP_1 (03-13-2018)

  14. #8
    BABOafrica's Avatar
    BABOafrica is offline HYPER GIANT
    Points: 58,790, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 32.0%
    Achievements:
    200+ Posts Achievement!First 1000 Experience Points400+ Posts Achievement365 Days+ Registered Achievement!5 Threads Achievement!
    Join Date
    May 2011
    Location
    Nairobi, Kenya
    Posts
    6,119
    Points
    58,790
    Level
    100
    Thanks
    1,407
    Thanked 2,727x 2,405 Posts
    Downloads
    3
    Uploads
    0

    Default Re: NGC 2403 a spiral galaxy in Camelopardalis

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

    Joe
    In lumine tuo videbimus lumen

    SCOPES: DIY f/4.5 17.5” Dob -- Meade f/9 102mm APO -- Celestron SCT C8 -- Sigma f/5.6 400mm APO lens
    SOFTWARE: DSS -- StarTools -- GIMP -- Bahtinov Grabber 64
    EPs: TV Nagler 13mm / PARKS Gold Series--5 pieces / Zhumell 3mm
    MOUNT: Celestron AVX ****
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.
    CAMERA: Fujifilm X-A1 (mirrorless) / Orion-SSAG

  15. The Following User Says Thank You to BABOafrica For This Useful Post:

    JohnP_1 (03-13-2018)

  16. #9
    JohnP_1's Avatar
    JohnP_1 is offline CMDR, The Eagles Nest
    Points: 57,324, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 19.0%
    Achievements:
    2 Posts Achievement365 Days+ Registered Achievement!20 Posts Achievement!Gallery Achievement!Album Achievement!
    Join Date
    Feb 2014
    Location
    Mystic, CT
    Posts
    4,145
    Points
    57,324
    Level
    100
    Thanks
    2,023
    Thanked 1,640x 1,519 Posts
    Blog Entries
    50
    Downloads
    0
    Uploads
    0

    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.
    KT4HX and bladekeeper like this.
    The Eagle's Nest - Bortle 4-5 sky - scopes: Celestron C8 SCT w/MOTOFOCUS; ES ED102 APO CF MoonLite w/auto focus! FR/FF(s): Starizona SCT Corrector; Stellarvue 0.8 FR/FF; Explore Scientific 1.0 FF Filters: 1.25 inch - Orion Ha (1.25in), 2 inch - UHC, polarizer, Orion Sky Glow, Astronomik CLS-CCD Mount: Celestron AVX Cameras: Canon 60d (modded); Atik 383L+ OSC Guiding: Olivon OAG; ZWO ASI120MM; QHY QHY5-II Mono

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.

  17. #10
    Testgear's Avatar
    Testgear is online now HYPER GIANT
    Points: 26,048, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 40.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Join Date
    Feb 2016
    Location
    Great Britain
    Posts
    3,474
    Points
    26,048
    Level
    100
    Thanks
    17
    Thanked 1,220x 1,037 Posts
    Downloads
    1
    Uploads
    0

    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.
    Dave
    MOUNTS : Mesu 200, NEQ6 Pro, Celestron Advanced GT, CAMERAS : Unmodded Canon 50D, ATIK 4120EX OSC, Lodestar X2, Celestron NexImage 5,ZWO ASI290MC COOL Colour. StarSense, LENS'S : C11. Hyperstar, Celestron Reducer/Corector f6.3. OTHERS : Seymour Solar SF1200 12" Type 2 Glass Solar Filter, Hutech IDAS LPS D1-2 filter, eyepieces, Laptops.SOFTWARE: PixInsight, GIMP2, PHD2, Cartes Du Ciel, EQMOD, ASCOM Platform 6.2, ArtimisCapture, SGPro, TeamViewer :
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.

  18. The Following User Says Thank You to Testgear For This Useful Post:

    JohnP_1 (03-14-2018)

 

 
Page 1 of 2 12 LastLast

Similar Threads

  1. DSLR Deep Sky Imaging: Barred Spiral Galaxy NGC 2146 in Camelopardalis
    By jschr338 in forum Astrophotography Forum
    Replies: 12
    Last Post: 01-25-2016, 07:40 PM
  2. DSLR Deep Sky Imaging: Spiral Galaxy NGC 2336 in Camelopardalis
    By jschr338 in forum Astrophotography Forum
    Replies: 16
    Last Post: 01-17-2016, 06:42 PM
  3. spiral galaxy in Camelopardalis
    By johnrfeeney in forum Astronomy Sketching Forum
    Replies: 8
    Last Post: 11-14-2013, 01:57 AM
  4. DSLR Deep Sky Imaging: NGC 2403 Galaxy
    By tsmith in forum Astrophotography Forum
    Replies: 12
    Last Post: 01-09-2013, 01:20 PM
  5. IC 342 (Caldwell 5) - a galaxy in Camelopardalis
    By ukastronomy in forum UK Astronomy Forum
    Replies: 0
    Last Post: 12-21-2007, 09:26 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBulletin® Version 4.2.0
Powered by vBulletin®
All times are GMT. The time now is 09:05 AM.