Sirius B

[John Hothersall]

SPX350 11585mm fl - 0.1-0.9 arc sec/pixel, PGRFlea3, Baader LRGB. A+B mags -1.47+8.4 10.? arc sec separation.

This is not really a planet but I consider this section the orbiting section - Looks like I got moved to deep space section.

This has a period of 50 years and is now a touch over 10" separation and can be split visually even with smaller scopes. I did this a couple of hours before Jupiter on 25th. Very faint in red but clear in blue filter. Visually best separated in the blue filter. In the UK twilight viewing seems to lessen the glare somewhat making it easier as its is very low from UK.

Regards, John.

[blink138]

great john, a good thread on at the moment discussing exactly this on the visual astro forum!
pat

[bigjoe]

Thanks for this wonderful image John, it could not have been more timely, as we've been discussing it in a thread above for some time!

That's interesting about viewing in twilight; another good tip!:thumbsup:

And the colour there of the PUP, is as I saw it, at the EP to my eyes; and agree about the blue filter visually as the red was hopless in my setup.

Cheers bigjoe.

[Camelopardalis]

That's a cracker John :thumbsup:

[astronobob]

Good one John,, quite some magnification there - I assume this helped to some degree, well done & yeah, good for the other thread out there, just read through parts recently .. :thumbsup:
Rgrds

[John Hothersall]

Thanks everyone, I did not know there was another thread in visuals otherwise I would have put it there.

I did have a go at it visually in 2011 and used 320x mag and it popped in and out of the diff spike of my newtonian worst luck, the blue filter kept it out more permanently on 2 successive nights. My scope position has now changed rotating diff spikes conveniently by 45 degrees.

I used the same fl as I used for Jupiter so it was pretty long. Sirius B is about 110 pixels out from A, I would advise 0.20"/pixel to get it nicely separated out.

Regards, John.

[Placidus]

Amazing. How did you take the photo? Did you for example take hundreds of subs, keep the very best, and stack them? Did you deconvolve?

[multiweb]

Cool shot John. :thumbsup: Massive separation. I had a go at 2.4m but I didn't get the pup quite as far as your shot.

[Shiraz]

spectacular image John - well done.

[John Hothersall]

Thanks again.

Marc I saw your image on the visual forum and it still separates out obviously at 2.4m - would have thought 6m at least. We have the advantage in Au of overhead viewing. Back in the UK it dances on the rooftops scintillating severely.

Mike and Trish I image planets with my 350mm newtonian and Flea3, so after collimating on the star Sirius and turned the gain down on my Flea3.

Red,Green-3000frames 16fps
Blue-4000frames 16fps
Luminance-2000 frames 22fps.

I sharpened with Registax5 wavelets and used the histogram for more stretching and stacked RGB with MaximDL and finished in PShop. Simple quick processing really.

I imaged it back in 2011 with a Mintron and the RGB gave a pleasing slight blue colour.

Regards, John.