A quick wander through Leo.

[lunator]

Conditions last night were pretty good. I spent most of my time teasing detail out of Jupiter as this run of sessions seems to be favourable to seeing more detail than usual. But I could not total ignore observing some doubles so I popped over to Leo  

STF1419 - A close pair of uneven magnitude, split at x60 best view at x100 white primary/orange secondary.

STF1434 - A neat pair of orange stars split at x50. Even magnitude, part of a nice right-angled triangle asterism.

STF1442 - A fairly wide pair of white stars, even magnitude split at x50.

STF1446 - A close pair with a moderate difference inmagnitude. Primary is white/secondary pale blue. split at x100.

STF1472 - A wide pair of uneven magnitude easily split at x50. Yellow and pale blue. shares view with AG341.

STF1477 - A pair of off-white/cream stars , even magnitude and spilt at x50.

Cheers

Ian

[John]

Thats a nice list Ian

We have another really hazy night here tonight and there is not too much happening on Jupiter so the brighter doubles are just about visible. Most notable for me this evening was STF 1536, Iota Leonis. I was using my ED120 refractor and got a really nice split at 257x with the much more distant and much fainter C componant just on the edge of the field of view.

I've split this before but on a night when mist dominates its an even nicer reward this time I think

[lunator]

John, it was quite hazy last night, the seeing was pretty good. I think we are suffering from Saharan dust contrails now. There was less to see on Jupiter but he still looked good cheers Ian

[John]

I managed to get A+B and C Iota Leonis with my 4" Vixen refractor this evening. It needed 189x and 221x to get the tight A+B pair but I'm pleased with the little frac

The conditions were hazy again and the 11th mag C componant was elusive much of the time.

[cotterless45]

Same here ! You sure that you've not got a webcam installed here !

102 Vixen M at x218. I'll be out again tonight , see if I can find your spy cam !

Nick.

[John]

Same here ! You sure that you've not got a webcam installed here !

102 Vixen M at x218. I'll be out again tonight , see if I can find your spy cam !

Nick.

[chiltonstar]

Seeing these posts, I thought I'd have another look at Iota Leonis! I set my Mak up alongside my ED80 (I'd seen a post on CN which reports the AB components being split with 80mm).

With the ED80 at x200, the AB split was obvious, although not much space between them and B a slightly fuzzy disk. C was visible fairly easily. I assume it was C as it was in the right place, at about the right sep. Colours for AB? yellowish and grey-white.

With the Mak, it took some time to settle on account of the buffeting wind, but A and B were cleanly split at x250, with B a bright pinpoint. C just about visible with averted vision, but not easy. Colours? Yellow and a definite lilac/pale blue.

Chris

[John]

Well done Chris !

Any advance on 80mm ?

I'll have to break out my old 60mm F/13 Tasco ....

[cotterless45]

Looks like the Grunge scope 60mm will have to dug up.

I had a look at Ian's list and had a very pleasant time observing most of these new ones. Observing reports are very much appreciated and used, even if it's only one star,Nick.

[chiltonstar]

 

I'll have to break out my old 60mm F/13 Tasco ....

Might be a bit too optimistic....!

But seriously though, the table in the front of Sissy's book re splitting unequal doubles is, IMHO, a bit too pessimistic. It would be nice to find, or maybe write, a simulation program to show what doubles really do look like through a scope of a given aperture, with additional parameters the mags of the two componets, separation, PA, spectral class, seeing etc.

Something to work on....

Chris

[lunator]

Might be a bit too optimistic....!

But seriously though, the table in the front of Sissy's book re splitting unequal doubles is, IMHO, a bit too pessimistic. It would be nice to find, or maybe write, a simulation program to show what doubles really do look like through a scope of a given aperture, with additional parameters the mags of the two componets, separation, PA, spectral class, seeing etc.

Something to work on....

Chris

Chris

I am looking at this at the mo

Cheers

Ian