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Other "double doubles "


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A few on view at the moment and a lovely one in Taurus to note, in addition to the Lyra epsilon " double double",

Taurus. STF7 (SAO 75970) and STF401 at x48. Two pairs of near equal stars inclined at an angle towards each other.

Leo. Leonis 83 and tau Leonis. Parallel pairs at x48 (SAO 118864)

Lyra. STF2470 and STF2474. Two parallel pairs at x57.

19h 08.8m. +34 46'

19h 09.1m. +34 36'

Cygnus. S786 and STF2789. Two parallel pairs at x48.

21h 19.7m. +53 03'

21h 20.0m. + 52 59''

Nicely amusing for visitors,

Nick.

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Thanks Nick, didn't know about some of those, so I'll take a look when I can.

There's also the Pegasus 'double double'  Struve 3012 & 3013, RA 23h 28m, DEC + 16.38.

Struve 3012 - Mag 8.2 / 9.3, separation 2.8"    and    Struve 3013 - Mag 8.5 / 10.2, separation 3.1"

Only Struve 3012 is plotted on my Cambridge Double Star Atlas.

Regards, Ed.

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  • 2 weeks later...

I gave a couple of them a go!

Here is Cygnus. S786 and STF2789. Or I`m  pretty sure it is.

And then I took a look at Lyra. STF2470 and STF2474. 

These are with a Watec 120N+, Celestron C9.25 and a quick run through on Registax 6

post-3820-0-11547000-1398976483_thumb.jp

post-3820-0-68793700-1398976576_thumb.jp

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  • 2 weeks later...

Thanks Nick, more for my list! I've never found a definitive list of close pairs of doubles (not insisting that they be physically related). 

The ones I've seen so far are:

epsilon Lyr, of course

STF 2470 and 2474

STF 1062 (19 Lyn) and 1050  (14.7" and 19.3", 07h22m52s +55°16'53") ... and STF 1025 further away

gamma Del and STF 2725  (9.4" and 6.1", 20h46m40s +16°07'27")

kappa and iota Boo  (13.5" and 38.8", 14h13m28s +51°47'16")

zeta CrB and STF 1964  (6.3" and 14.7", 15h39m23s +36°38'09")

STF 3062 and 3057 in Cas  (1.5" and 3.8", 00h06m16s +58°26'13")

And I really want to have a look at nu Sco, STF 2816/2819 in Cep, S 715/716 in Sgr, and as many others as I can get an eyepiece around! If anyone has any other suggestions I'd be very interested. 

Personally I prefer the wider ones - a tight double is a nice challenge, but for a double double you're always going to have one of them in your peripheral vision, so they both have to be easily split. 

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