Sirius B by iphone

sn1987a (Barry) · #1 10-11-2014, 04:31 AM

iphoning between waves of cloud. Webster 28"f4 with 10mm Ethos and Paracorr and iphone.

edit
...err apparently not Sirius B

gregbradley · #2 13-11-2014, 07:58 AM

How about that eh? Amazing.

Greg.

Geoff45 (Geoff) · #3 13-11-2014, 08:42 AM

I presume it's the little dot at about 11o'clock. As Greg says--amazing!
Geoff

RickS (Rick) · #4 13-11-2014, 11:52 AM

I was wondering about that. In previous images I have seen the "pup" has been quite close to Sirius so I don't think the little dot is it?

sn1987a (Barry) · #5 13-11-2014, 04:36 PM

In my 28 f4.2 the magnification is roughly 300x with the 10mm Ethos and Paracorr. Sirius B is clearly separate from Sirius when viewing by eye but I had to expand (two fingers) the image on the iPhone before it would photograph. Hope that makes sense. I was actually testing out some alterations to the ServoCat tracking at the time.

So yes little dot around 11 o'clock.

Peter Ward · #6 18-11-2014, 10:17 PM

Interesting pic, but looks way too far from Sirius A to be the Pup.

Even Hubble struggles to get it cleanly beyond the glare of it's parent:

http://hubblesite.org/gallery/album/star/pr2005036a/

I'd suggest it's more likely an internal reflection of the phone lens.....

sn1987a (Barry) · #7 19-11-2014, 12:45 AM

You inpugn me sir!

Myself, my Webster and my iphone: we will have satisfaction!.

Yourself, your proxy or anyone who doubts is welcome to see for themselves, anytime, (bring a clear sky and a large humble pie).

http://www.dfacaz.org/quidnovi/2010/...0/Sirius-B.jpg

jenchris (Jennifer) · #8 19-11-2014, 07:39 AM

How much does the pup wander?
I got a pic a while back and it was like a lump on the side of the glare.

Peter Ward · #9 19-11-2014, 10:23 AM

Quote:

Originally Posted by sn1987a

You inpugn me sir!

I have no doubt you can split it visually on a good night...even my 6" Starfire can do that at the current separation.

But my experience has been cameras don't cope with the glare well. Hence I remain unconvinced with that considerable space beyond the parent's glare, it's anything other than a lens reflection.

BTW...another error. it's impugn

RB (Andrew) · #10 19-11-2014, 10:57 AM

Quote:

Originally Posted by Peter Ward

BTW...another error. it's impugn

Peter, those two letters are so close together in the alphabet, they're hard to split sometimes.

sn1987a (Barry) · #11 19-11-2014, 10:58 AM

[BTW...another error. it's impugn

[/QUOTE]

Goddammit!!

Well I'll have another go at it tonight.

...and Sirius B

jenchris (Jennifer) · #12 19-11-2014, 01:48 PM

This is the one I got Jan 2013

Peter Ward · #13 19-11-2014, 08:59 PM

Quote:

Originally Posted by jenchris

This is the one I got Jan 2013

Looks to be in a correct and eye-pleasing position

brian nordstrom (As avatar) · #14 19-11-2014, 09:12 PM

Would love to , one of these nights when I don't have to get up at 4am for work , Barry .
Brian.

Quote:

Originally Posted by sn1987a

You inpugn me sir!

Myself, my Webster and my iphone: we will have satisfaction!.

Yourself, your proxy or anyone who doubts is welcome to see for themselves, anytime, (bring a clear sky and a large humble pie).

http://www.dfacaz.org/quidnovi/2010/...0/Sirius-B.jpg

sn1987a (Barry) · #15 20-11-2014, 07:34 AM

Peter, I like eat my humble pie served in an old hat with lashings of "Doh"
Cheers

Ok after taking a few more images with the iphone I find what I thought was Sirius B was actually a nearby star along roughly the same line. I was fooled into thinking it was Sirius B because the image on the screen looked very similar to what I could see at the eyepiece. Sirius B is actually drowned in the glare of Sirius on the iphone

.

I'll keep trying for a real iphone Sirius B

Peter Ward · #16 24-11-2014, 09:53 PM

Maaaate.... no loss-of-face here.

....and you are not Robinson Crusoe in thinking it was Sirius B

sn1987a (Barry) · #17 02-12-2014, 02:10 AM

OK I think I've got it this time I've used a 3.7 Ethos to get roughly 900x instead of the 300x last time with the 10mm Ethos. Double checked by slewing out to the star that I thought was Sirius B last time along the same line. So I'm confident now that this is Sirius B by iphone

RichardJ (Richard) · #18 02-12-2014, 07:15 AM

Quote:

Originally Posted by sn1987a

OK I think I've got it this time I've used a 3.7 Ethos to get roughly 900x instead of the 300x last time with the 10mm Ethos. Double checked by slewing out to the star that I thought was Sirius B last time along the same line. So I'm confident now that this is Sirius B by iphone

Hi Barry,

Well done. Looks like you got it.
Here is an image I took with my 10 inch scope last year for those who want to see Sirius B.

RichardJ

multiweb (Marc) · #19 02-12-2014, 12:46 PM

Nice! Time for a cigar!

AstroJunk (Jonathan) · #20 02-12-2014, 01:04 PM

It is such a difficult target to verify

For those trying similar adventures, it's worth trying the following:

A) Image Canopus. It's another very bright star and it may show up lens reflections and dust motes (I got caught by that the first time!)

B) Calculate the image scale exactly then measure the separation. A little trick with eyepiece projection, but here is a tool to get the approximate focal length: http://starizona.com/acb/ccd/advequipplanet.aspx then apply (Pixel Size * 206) / Focal Length to get the arc secs per pixel.

C) Verify the PA of the star by switching the guide motors off and watching the direction of drift. Conveniently, Sirius B is directly behind at the moment! As per images from 2008 using 20" dob and 5000mm focal length.

D) keep at it!

Well done Barry