Two nice doubles visible in one FOV

[pepitoz]

Recently I discovered two very nice doubles in Aquila - both visible in one FOV!

Look 1.5 degrees east of Zeta Aquilae - there you should find a close pair of 5th mag stars. These are the doubles.

The one to the north is Otto Struve 4178 (STT 4178). It consists of a 5.5 mag red primary and 7.5 mag blue secondary separated by about 90''. The colors are very obvious, making this a very pretty pair. It's also really wide - it can be split with binoculars!

The other double is Struve 2489 (STF 2489). It is significantly harder to split - a 5.5 mag blue-white primary and a 9.5 white secondary separated by 8.2''. It is an easy split with my 10 inch dob, but may be a challenge for small scopes. Still, very nice!

Both pairs were fit in FOV and split with a 48 magnification eyepiece. Struve 2489 however is much easier to see with 120X. 

Very nice doubles! Definitely worth checking out!

RA: 19h 15.8m     DE: 14° 50'

STT 4178      Separation: 90''                                  STF 2489     Separation: 8.2''

Components     Magnitude      Color                        Components      Magnitude     Color

A                       5.5                  Red                          A                       5.5                 Blue-white
B                       7.5                  Blue                         B                       9.5                  White

[cotterless45]

This is a lovely area, are you meaning ΟΣΣ178 ?

Nick.

[pepitoz]

This is a lovely area, are you meaning ΟΣΣ178 ?image.jpg

Nick.

Yes - this is the double. According to http://www.eaglecreekobservatory.org/eco/doubles/aql.html the double is called STT 4178. Maybe Eagle creek observatory made a mistake or both names are referring to the same thing. 

[algol]

Very nice. The red and blue double sounds really something to look at