Saturday, August 1, 2009

The Cygnus Sweep

So let it begin.

Starting from the top down in Sissy Haas' Double Stars for Small Telescope and newly acquired Cambridge Double Star Atlas I started to make the sweep through Cygnus with the hit list being from Haas' book. I gave them a rating on how I felt about how they looked in either scope. The Pronto, despite it's size kept pace with the old SP-C102 which after receiving it's collimation, is running just fine as the new/old Struve hunter.

TeleVue Pronto

Struve 2486 (****)
What a pleasant surprise! With so little differential in magnitude (6.5 and 6.7), this neat double is indeed the "kissing double" as described in the DSST. With only a separation of 7.3" it is easy to split in either telescope. Looks great in medium to higher power, but not too high so you don't dim the view.

Albireo (Beta Cyg) (*****)
Although in the list, I didn't observe it tonight because I know this star like the back of my hand

16 Cyg (Struve II 46) (*****)
Can't let Mr. SUG have all the fun. What a dynamite pair. Of course this is located right next door to the Blinking Planetary Nebula but forget that because I am in the city. Wide and bright, it is easily observed in both scopes. Most people really need to take a look at 16 Cyg with a separation of 39.1" and very little in the magnitude differential. Certainly a showpiece pair right up there with Albireo.

Delta Cyg (Struve 2579) (***)
Was already observed previously this year. This is a tight double star with a dramatic magnitude difference of 2.9 - 6.3. and only 2.5" separation. It is easily observable in a four inch refractor but I don't recall trying this in the Pronto. I will have to see. Still a very nice site.

Struve 2578 (****)
Another nice site. The DSST calls for a colour difference but I wasn't seeing it. I will have to try harder. With a separation of 14.7" it is fairly easy to find and especially because the mag difference is not all that much (6.4 - 7.0). Very easy in either telescope but it is located in a busy stretch of Cygnus so you will have to do some hunting here. But it is worth it.

Next up...17 Cyg.

Who is this and why are you in Cygnus?...well okay, you're not. But what a way to end an observing session. While tearing down the 102, I put the Pronto on Jupiter but alas, seeing had degraded and not much to report here except a few cloud bands and the moons. Too bad too.

A productive night to say the least. I am pleased the 102 can be a true Struve hunter. I am also please the Pronto keeps up quite nicely despite that it is only 70mm. But all in all, a great experience. Both the DSST and The CDSA are excellent to work from and highly recommended.



  1. What a fun observational time. Thanks for mentioning me in conjunction with a fine Dbl Star as 16 Cyg!

    I cannot recall observing Str 2486 - it is on my to do list!

    Glad your scopes are knocking them out for you!

  2. Great double star targets Marc. Did you see the write up about the Cambridge Double star atlas in this months Sky and Telescope. I think I made a good choice in obtaining that atlas. thanks to you and SUG for getting me interested in observing the doubles!
    Looking forward to our Virtual Dbl. Star Observation

  3. Glad you guys enjoyed the posting. Hopefully I will be out again. Doubt this evening, but soon!