The Twins' Twins...and others

Hi all

Got out last evening for a tour of Gemini and came up with the following:

Otto Struve 134: Located on the edge of M35 this unequal white pair are almost swamped by the cluster stars and it's only by working out their PA that I can be sure which stars are the double.
15 & 18 Geminorum These are two sets of doubles that I managed to fit into the same FOV using the 30mm Moonfish yielding a magnification of 27X. 15 is a nice yellow/blue combination with a 2 magnitude difference. 18 is a white pair of wide magnitude variance and wide separation, the companion is a brilliant white star that takes magnification well.
20 Geminorum: An equal pair of gold and white stars in a sparse field, with a separation of 20 they are easily visible at low magnification.
25 Geminorum: This is a triple system of white members, the primary is 6th mag., the companions are very faint at 10th & 11th mag, the C star is twice the distance from the primary than the B star.
Struve 1027: A lovely pair of equal 8th mag orange suns surrounded by fainter stars, well worth checking for the colours.
Struve 1035: Similar in magnitude to Struve 1027, but whereas 1027 had orange stars, 1035 boasts yellow stars with a similar separation.
Struve 1083: A faint pair of unequal white stars in a barren field. The companion is said to have a greenish tint, I confess that I could not see it, which is a pity, I would like to see a green star.
Struve 1094: A very tight pair of 7th & 8th mag stars with a small separation of 2.5. At 63X the separation was visible, 103X made it obvious.
63 Geminorum: An easy pair of white suns, there is a 4 magnitude difference between the pair, but with a separation of 43 this difference did not affect the splitting.
Struve 1108: An Albireo system wannabe, the colours are very similar to the famous Cygnus double, the magnitudes are lower at 6.5 and 8.3 and the separation smaller. They sit in a well populated field and are obvious at low magnification.
Alpha Geminorum: A very easy split, there is only a single magnitude difference between the pair so the low separation of 4 isn't a factor. Seen best at 103X where it's like looking at a pair of headlights, with the inferior optics of the achro the extra blue tint added gives this pair a pretty nice look.
Pi Geminourum: This triple system has a nice orange primary with very faint companions with large separations.
Struve 1140: A tight pair of unequal members, both white at 8th mag & 10th mag respectively neither is brilliant.
Struve 1156: Similar to Struve 1140, similar magnitude members, same colours, just a slightly wider separtion.
Struve 899: This white pair are very close together, at 103X they were easilt separated, again their similar magnitudes made this possible, they are 7th & 8th magnitude with a separation of 2.3.
Struve 957: A couple of faint white stars in an empty part of the Gemini, they are separated by 3.5 and as with 899 their similar magnitudes make the split possible.

I'll have to return to Struve 1083 to try and get that green star as I imagine there are not many out there.

Paul --

While none of them are a very saturated green, I see avocado or pale green in the following:

Delta Herculis
100 Herculis
Psi Cygnus
Theta Serpentis
Beta Orionis
Delta Orionis (probably the strongest green to my eyes)
Alpha Canes Venatorium

I've added STF1083 to my observing plan to see what it's like.

Cheers,
-- Jeff.

Thanks Jeff, I'll add those to the list.

I'm glad you posted that Jeff. I've also seen green in Cor Caroli's secondary, in my 4" refractor. Having said that, in Neil's 6" refractor it was lilac, and in the C6 it is white ???