Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

sgl_imaging_challenge_banner_beauty_night_skies.thumb.jpg.2711ade15e31d01524e7dc52d15c4217.jpg

davhei

Mayall II

Recommended Posts

To begin this year’s dark season I wanted to try something faint in order to really get the feeling of dark skies again. Have had the andromeda galaxy globular clusters on my list for a while and decided to give G1 or Mayall II, the brightest one, a go.

Finding M31 wasn’t difficult and even though G1 was surprisingly far from the core regions it was still a fairly easy star hop. Had prepared detailed charts beforehand and that certainly helped. The difficult part was identifying the triangle asterism with two stars in one corner, a faint star of similar magnitude in the second and G1 with a magnitude of 13.8 in the third.

Once dark adapted it was a distinct but faint averted vision asterism but I found that at higher magnifications I lost it a couple of times and had to start over with wider field EPs.

Mayall II appeared starlike at first, and after a while I thought it took on a slightly diffuse appearence. Either from the two faint stars close to G1 or from that it had an angular diameter greater than a pinpoint star. Could never separate the glob from the two stars for certain even though I may have glimpsed it at times. Or not. Could have been tricks of the mind.

Spent some time on this object and found it really enjoyable. First in a session a few days ago and then again yesterday when I made a sketch as a keepsake. Had major dew problems on the secondary mirror though that made sketching more difficult.

Shall have to try the fainter M31 globulars as well, maybe doable but would certainly stretch the limits of the scope and myself.

 

5ACB34C8-45CF-47A9-ACD5-B89E318848B2.jpeg

670A9EC2-C16F-44A6-9584-783DC578FC6F.jpeg

Edited by davhei
  • Like 7

Share this post


Link to post
Share on other sites

Nice observation. A good target too. Unfortunately beyond me in my LP skies.

  • Like 1

Share this post


Link to post
Share on other sites

What  a super idea to go hunting this target out - thanks for the inspiration. Mike

  • Like 1

Share this post


Link to post
Share on other sites

Thats really nice - does that 254 mean its a 254mm mirror? I guess that means I probably wont see it in my 90mm telescpe. Is that just in pencil? How did you make the smudge shape for M31?

  • Like 1

Share this post


Link to post
Share on other sites

Amazing observation, Davhei :thumbright: Not only blessed by good skies but excellent observation skills. So glad you made a sketch of this. Not only as a nice record of evens but also a tip-top reference for future observers. Thank you :smiley:

  • Like 1

Share this post


Link to post
Share on other sites
11 minutes ago, MimasDeathStar said:

Thats really nice - does that 254 mean its a 254mm mirror? I guess that means I probably wont see it in my 90mm telescpe. Is that just in pencil? How did you make the smudge shape for M31?

Aye, 254 would be the mirror size: 254mm or around 10". The 1200 number is the scopes focal length: 1200mm.

Clearly lacking the skills of Davhei, I think I'd struggle to find Mayall II with a 10" under dark skies :biggrin: With an apparent magnitude of around 14, even under dark skies, I reckon Mayall II is a tad beyond what a 90mm could pick out

Not wanting to speak for Davhei but I imagine it is a pencil sketch of Mayall II (not M31) and the smudge could have been produced with a blending stump.

  • Like 1

Share this post


Link to post
Share on other sites
12 hours ago, Rob Sellent said:

Aye, 254 would be the mirror size: 254mm or around 10". The 1200 number is the scopes focal length: 1200mm.

Clearly lacking the skills of Davhei, I think I'd struggle to find Mayall II with a 10" under dark skies :biggrin: With an apparent magnitude of around 14, even under dark skies, I reckon Mayall II is a tad beyond what a 90mm could pick out

Not wanting to speak for Davhei but I imagine it is a pencil sketch of Mayall II (not M31) and the smudge could have been produced with a blending stump.

Thank you for your kind words! Not sure I deserve all that much praise on the observation skills, it mostly boils down to aperture and dark skies I think. 90 mm does seem a tad on the small side for this object though. As a side note, the deepest I've gone with my scope setup is in the range of mag 14.4 +/- 0.2 for a quasar and thereabout I think is the limit for my location.

You are spot on, 254 mm or 10 inches is the mirror size and 1200 mm is the focal length. The technique is also just like you guessed, a blending stump to create the diffuse effect and a soft pencil to get the graphite for the stump.

  • Thanks 1

Share this post


Link to post
Share on other sites

Wonderful report. You’ve inspired me to give this a go in my 10” dob. Excellent observing skills :) 

  • Like 1

Share this post


Link to post
Share on other sites
43 minutes ago, Littleguy80 said:

Wonderful report. You’ve inspired me to give this a go in my 10” dob. Excellent observing skills :) 

Brilliant! I recall that you inspired me to observe quasar PG 1634+706 in draco. If you could see that then Mayall II should be a breeze. 😀

  • Thanks 1

Share this post


Link to post
Share on other sites

I had a look at Mayall II in my new 20 inch and it looks just like your sketch.

I could not separate the two stars next to the globular either.

Great sketch.

Mark

  • Like 1

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.