Beginner's list

[leo82]

Hi all,

I'm looking for a nice easy double star list that would be in reach of a 90mm refractor. 

Many thanks 

 

[DarkTraveller]

Hi leo

With my 90mm Williams Optics I like the Astronomical League's doubles program for smaller instruments.  There's a PDF available for downloading. 

https://www.astroleague.org/al/obsclubs/dblstar/dblstar1.html

Ted

 

[lenscap]

This list from Sky & Telescope is handy.

https://www.skyandtelescope.com/observing/celestial-objects-to-watch/pretty-double-stars-for-everyone/

[Knighty2112]

Sissy Haas is good resource of double stars for small telescopes, but you need a star atlas to compliment it too, either online, or on a tablet/phone, or a hard copy atlas.

https://www.365astronomy.com/Double-Stars-For-Small-Telescopes-by-Sissy-Haas.html

[leo82]

Thanks for the replies all, these lists should keep me busy for a while.

I've got the cambridge double star atlas, but as a beginner it's hard to know what's easy medium and hard especially when using smaller telescopes.

[Knighty2112]

1 minute ago, leo82 said:

Thanks for the replies all, these lists should keep me busy for a while.

I've got the cambridge double star atlas, but as a beginner it's hard to know what's easy medium and hard especially when using smaller telescopes.

In that case Sisy Haas would also work a treat here, as use both these tomes together to home in on doubles.  

[leo82]

Does sissy Haas categorise the lists, I have the charts, if sissy Haas lists are easy to understand then I think it's exactly what I need.

[Knighty2112]

3 minutes ago, leo82 said:

Does sissy Haas categorise the lists, I have the charts, if sissy Haas lists are easy to understand then I think it's exactly what I need.

It puts them in order of constellation. Here’s a image I got online showing a page some of Come Berenice’s doubles.

[Knighty2112]

See aboveimage!  

[leo82]

That book looks fab, got to get it! I like the details at the side.

What would the limit be for a 90mm?

[Knighty2112]

It’s predominantly written for small scopes, so most of the doubles should be pretty much doable. 

[leo82]

Ahh that's cool, now to find who's selling it the cheapest!

[wookie1965]

Cheapest I have seen.

https://www.365astronomy.com/Double-Stars-For-Small-Telescopes-by-Sissy-Haas.html

[cloudsweeper]

On 21/08/2018 at 20:24, leo82 said:

 

What would the limit be for a 90mm?

In theory, the best separation with a 90m aperture would be about 1.3 seconds of arc, but it also depends on seeing, transparency, your eyes, and the nature of the target system.  In practice, getting under 2 seconds is good going, 3 or 4 being more manageable.  But that still leaves a very large amount of interesting and varied doubles to enjoy, many with much wider separations.  As Gus says, there are lots of do-able doubles!

Doug.

 

[Alfian]

A good post and some very useful links thank you.