Jump to content

 

1825338873_SNRPN2021banner.jpg.68bf12c7791f26559c66cf7bce79fe3d.jpg

 

A Globular Feast


Mike JW
 Share

Recommended Posts

  • 4 months later...
  • 2 months later...

M3 in CVn made for a nice diversion from chasing galaxies on 30/3/21. Its age is thought to be about 11.8 billion years and is classified in group 6 (mild concentration of stars towards the centre), contains around 500,000 stars, and lies about 33,900 lyrs from us, it is 180 to 200 lyrs across.. Its central core is just 11 light years across. The brightest stars are about mag 12.7. As it orbits the Milky Way, it can be as far out as 66,000 lyrs from the galaxy centre and get as close as 22,000 lyrs at which point some of the outer stars maybe stripped away. 268 variable stars have been located in this cluster.

1181317970_Messier331Mar21_19_32_49.png.ca888c5d7b025b231df420c790e7bcac.png

  • Like 2
Link to comment
Share on other sites

  • 4 weeks later...

Well it was a bit of a bright moon the other night and I had decided to do a bit more LRGB observing using Jocular. No sign of any brightish planetary nebulae but a couple of globulars looked worth a glance.

Messier 3 has been well described by MikeJW in the post before this one. Here's what a bit of colour gave.

1787989479_Messier325Apr21_22_06_15.png.848cf78c58f00540f51a9fda6de7c43d.png

 

I then had a look at the nearby M53.  This one is a bit further away than M3 at around 60,000 light years in Coma Berenices. M3 is Shapley-Sawyer class VI (intermediate mild concentration) whereas this one is said to be a slightly tighter class V (intermediate concentrations).

1682477166_Messier5325Apr21_22_09_35.png.8f6c1a01dccec30f48ea6feea2752fbd.png

 

So after these too I had a look at NGC 5466. This is in Bootes and is about 52,000 ly away. It's a much looser class XII (almost no concentration towards the centre).

1660533272_NGC546625Apr21_22_22_44.png.cd89ab9bf7eaf738ffae5189dd3d5362.png

It has been found to be the source of an extensive tidal tail stretching more than 40 degrees. This has been pulled out by its passage closer to the centre of the galaxy (perigalacticon - I did not know there was such a word!) and has been extensively studied.

e.g. https://arxiv.org/pdf/1204.5771.pdf

 

Globular clusters - always worth a look!

Bill S

 

 

 

  • Like 3
Link to comment
Share on other sites

  • 1 month later...

Pal 5 in Serpens. I visited this globular as recorded at the start of this thread. Here it is again but this time with the 15/ultrastar set up. Even with this large aperture and over 5 minutes of exposure it is still very faint.

Mike

1282361313_Pal502Jun21_18_14_48.png.cdfd4710dd12012568939cdf3994a13b.png

  • Like 3
Link to comment
Share on other sites

Here are a few globs from last night. They are all from quite low altitudes so highly reddened. Scale is same apart from the last shot.

448088165_NGC569409Jun21_18_44_22.png.617889674485c24ced5ccb4328987fc5.png

490335616_Messier10709Jun21_18_43_07.png.2a8f10d45a401bc95ca0d9ac4678549a.png

1967617232_Messier8009Jun21_18_42_31.png.7c6b7e77da795d3591a89ea00853b716.png

 

349431199_Messier409Jun21_18_42_07.png.2994420826a7e8d1ae8e22257608acf1.png

1507793160_NGC614409Jun21_18_40_39.png.a90f8e8080bb5d522e6e1d108a8f7841.png

And finally, our old favourite sparse cluster, Pal 5, of which there are lots of images further up the thread

1886559448_Pal509Jun21_18_49_31.png.2e90f778169d15c79b77772c5f5927c4.png

 

This shot has the 1.8 billion light year galaxy cluster Abell 2050 in the top left corner (some galaxies can be made out). Distance estimate to Pal 5 is around 75k light years, so the galaxies are about 25000 times as far away as the globular cluster.

Martin

 

 

  • Like 5
Link to comment
Share on other sites

Hi Martin, You did well with the Pal 5 - so much better than my set up.  Makes me think I should try again but you do have the advantage of it being higher in the sky. Envious of you being able to get the low down globs.

Mike

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.