What do 2 stars 1.5 seconds of arc apart look like through a 25-cm telescope?

Question

What do 2 stars 1.5 seconds of arc apart look like through a 25-cm telescope?

Answer 1

They would look like two point sources separated by 1.5 arc seconds. You should be able to identify their colour if you have good optics and a stable atmosphere.

Answer 2

two stars, very close together. this is well outside dawe's limit for a telesscope of this size.

Answer 3

It turns out that a 10 inch telescope is 254 mm, or 25.4 cm.  I can generally split doubles that are slightly closer than 1 second of arc apart, if the weather is good.  At 1.5 seconds, i get to see both stars, clearly separated.  My scope is a Newtonian reflector on a very stable non-tracking mount.  It makes a big difference if the optics are properly aligned.  It is harder to separate close doubles if one is much brighter than the other.  The glare of one star can hide the other.

Answer 4

In good seeing, you should see two well-separated stars with their first diffraction rings almost touching. (Tina, that's 25 cm, not mm.)