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Good test stars for a 60mm scope

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#1 dlapoint

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Posted 03 April 2010 - 12:45 AM

I'm looking for some difficult, but possible double stars for my 60mm refractor. I would prefer stars in the east-south parts of the sky. my north and west skies are washed out from LP. Thank you.

#2 caheaton

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Posted 03 April 2010 - 05:06 AM

It's a bit SW, but you could try to see how many stars you can see in the Trapezium of M42. Likewise Sigma Orionis (in my 3" I saw 3 stars, the 10" revealed 4.) You could also try splitting Rigel.

Algieba in Leo. Those are a few I can think off offhand.
Craig

#3 exile

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Posted 03 April 2010 - 06:29 AM

If you are interested in testing the optics, try these two evenly matched test stars:

39 Boo 6.31,6.67 2.7" 46deg F6V+F6V
STF 2245 Her 7.43,7.55 2.6" 292deg

not exactly in the directions you stated, but should pass close to your canopy. Resolution of either of these will tell you if you have a good quality scope.

Check out the resources at the top of the page, too - lots of great observing lists here.

#4 dlapoint

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Posted 06 April 2010 - 05:55 PM

Thanks for the sugestions, the never ending rain is keeping me from observing.

#5 Clive Gibbons

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Posted 07 April 2010 - 01:45 PM

Izar (epsilon Bootis) would be worth a shot.

#6 Erik Bakker

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Posted 07 April 2010 - 05:17 PM

Izar (epsilon Bootis) would be worth a shot.


I second Epsilon Bo├Âtes.

A beauty in my 55mm f/8. From 90x upwards I see both components seperated. Beautiful color diffence as well.

Clear skies,

Erik

#7 dlapoint

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Posted 07 April 2010 - 10:18 PM

Thanks for the idea about Izar. I never thought about it because it is so low in the sky from my location as darkness sets in. But it is on the rise.

#8 dlapoint

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Posted 10 April 2010 - 09:57 PM

Well I split Izar tonight at 97x, the clouds rolled in before I could try any other stars in the bootes

#9 Jon Isaacs

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Posted 12 April 2010 - 03:26 PM

Doubles in a 60mm.

As others have said, Izar is a reasonable challenge for a good 60mm. It is probably too low and too late in the season but Zeta Orionis is doable in a 60mm as is the double-double which is reasonably well positioned in the morning right now.

Most older 60mm are setup to use 0.965" eyepieces, using modern 1.25 inch format eyepieces with wider better corrected fields of view certainly makes splitting tight doubles at high mags a lot easier. I was able to use part of a 1.25 inch diagonal as a visual back for my 60mm F/13.3 Asahi-Pentax and it's pretty wonderful at 170x with a 4.8mm Nagler.

Jon Isaacs

#10 Clive Gibbons

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Posted 14 April 2010 - 11:39 AM

Mu Draconis (in the north-east sky, later on) would be a target.

2.2 arc sec. sep and 5th magnitude components.

#11 PJ Anway

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Posted 14 April 2010 - 01:45 PM

Here are a few, the bottom two coming up in the early morning.
I tried to find doubles with equal magnitude stars; they make it easier for testing a scope's limits.

Attached Thumbnails

  • 3744898-60mm_test_doubles.jpg


#12 EdZ

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Posted 15 April 2010 - 09:17 AM

PJ

Other than STT437, I would think all of these would be impossible to split in a 60mm, other than being able to see them as a strongly overlapped figure 8 with perhaps being able to notice a notch. But, perhaps that's what you were thinking too?

My experience is 1.7" to 1.8" is the limit for an 80mm scope split. Of course all your suggestions are wider than that, but a 2" pair in a 60mm scope would probably be overlapped by 15-20%.

edz

#13 PJ Anway

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Posted 15 April 2010 - 06:08 PM

Edz,

You are right of course when it comes to clean splits, I guess I should have clarified what I meant by good tests for a 60mm. Elongation or "peanut shape" would be enough for a "split" as in duplicity determined = success. :D

#14 dlapoint

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Posted 16 April 2010 - 08:16 PM

Thank you for all the suguestions. My 60mm scope seems to excell at doubles. Its a lot of fun pushing a small scope.+


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