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Photo of Eta Cassiopeiae

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#1 Far Star

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Posted 10 January 2020 - 04:08 AM

Eta Cassiopeiae

 

m = 3.52 / 7.36; sep. = 13.38"; distance 19.4 light-years; photo taken on 01/09/2020 with Takahashi FC-100DL (100/900 mm) and 2.7x Barlow, ISO 800, 2 seconds exposure time

 

The primary is overexposed because I wanted to show the beautiful orange color of the secondary. It's a single frame. There was no post-processing done other than a very mild enhancing of contrast and cropping of the image. In particular, I have not increased the color saturation.

 

Eta-Cassiopeiae-20200109-100-900-Refrakt

 

Clear Skies,

Ulrich


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#2 happylimpet

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Posted 10 January 2020 - 04:25 AM

Ooooh that's beautiful! Thank you for sharing it.  I would never have thought that a photo of a double star could be so evocative and powerful but thats really something.


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#3 flt158

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Posted 10 January 2020 - 07:20 AM

Magnificent image!!

The secondary is almond brown alright. 

Sissy Haas states that in her book Double Stars for Small Telescopes. 

Its spectral class is K7 - almost red. 

You got the separation spot on too, Ulrich.  

Well done!

Eta Cassiopeiae is my favourite 4th magnitude binary in the entire sky. 

 

Clear skies from Aubrey. 


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#4 mauigazer

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Posted 10 January 2020 - 11:03 AM

Nice image. This system is actually a multiple star. Its one of the AstroLeague Multiple Star Observing Program objects. Components AB and C are close, and the D companion is quite a distance away. It is covered very well by John Nanson in his Stars Splitters blog here. Stella Doppie provides the Lit. here.

 

 

Iota Cas, Struve 262ABCD

Edited by mauigazer, 10 January 2020 - 11:09 AM.

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#5 Steve Cox

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Posted 10 January 2020 - 01:24 PM

Really nice capture.  I'm going to have to look at this one soon.  Every other time I've observed it over the last 10 years, all I've seen is of a bright white primary and dimmer white to yellow-white companion.  Apparently I've never been fortunate to catch it at minimum.


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#6 Far Star

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Posted 11 January 2020 - 03:35 AM

Thank you all for your kind comments.

 

Aubrey:

 

Your reference to how Sissy Haas saw the secondary is very interesting. It actually looks almond brown in the photo! By the way (and slightly off-topic): You inspired me to buy Guide 9.0. This is excellent, sophisticated and mature software. Thanks!


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#7 flt158

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Posted 11 January 2020 - 09:08 AM

That's a great purchase, Ulrich!

I can give you one tiny piece of advice. 

Keep an eye every now and again to make sure your Guide 9.1 DVD is kept clean and free from scratches. 

If you find you have damaged it in any way Project Pluto just might send you another DVD free of charge! 

 

Now you are going to discover where are those doubles with their unusual designations are - the ones I go after regularly.   

Well done, Ulrich!

Please keep giving us all your images here on Cloudy Nights. 

 

Clear skies from Aubrey. 


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#8 OJS

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Posted 11 January 2020 - 10:25 AM

Ausgezeichnet, Ulrich.

 

B always looks rose-colored in my FS 128 and Mewlon 210.


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#9 c2m2t

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Posted 11 January 2020 - 02:42 PM

Hi All!

This post inspired me to check my double star imaging efforts during my recent trek to Lyman Lake State Park in Arizona for the October new moon...and sure enough I found STF 60, a.k.a. Achird and Eta Cas.

 

Strangely, when I typed "Eta Cas" into the search window of Stelle Doppie, it brings up Caph listed first, followed by Achird...just one of those occasional misfires in SD. I can't say enough about Stelles Doppie...what a huge resource!!

 

This image, as with the vast majority of my double star imaging, is taken with a Canon 350D Rebel camera fitted with a Celestron Luminos 2.5x barlow through a Skywatcher 100 ProED scope (F9). The exposure is 30 seconds at ISO 1600. This is a full field image. I had forgotten that I had labelled the components onto an Aladin image of Eta Cas so I have simply transfered the labels. Component "H" was just outside the fov and "J" at mag 12.3 was not captured...which surprises the heck out of me. I will need to investigate that further.

 

I have done no processing other than erase all the hot pixels and specks in the jpeg.

 

Cheers, Chris.

 

 

 

 

Attached Thumbnails

  • Eta Cas, Achird-2383-sm.JPG

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#10 c2m2t

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Posted 11 January 2020 - 03:50 PM

Hi All!

Just wanting to bring you up to speed on a check via Aladin for the magnitude of the "J" component. With the exposure duration and ISO selected for this image, the typical best I can resolve is mag. 13. A check of the Nomad catalogue provides a Vmag of 13.81 and the UCAC4 survey gives a Vmag of 14.63. This explains why "J" was not picked up in the image. Therefore this component is in need of an update. I will add it to my list. 

 

Cheers, Chris.


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#11 chrysalis

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Posted 11 January 2020 - 06:04 PM

I perceive the secondary as "ashen salmon".


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#12 dmdouglass

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Posted 11 January 2020 - 06:15 PM

I too was inspired to go check back into my library, and compare my results....

Found this...

.

H-3-003-DS-20180830.jpg


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#13 Brollen

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Posted 12 January 2020 - 08:55 PM

Beautiful pairing.. I just finished looking at it with my FS-60Q - tonight’s sky having gauzy clouds. Using my 9mm Morpheus EP, I had a nice clean split with the secondary being a faint brownish color. Same with my 6.7mm ES EP while my Tak/Starbase 14mm Ortho showed the pair cleanly and the secondary seemed a bit brighter.

 

Thanks for sharing the inspiring photo.


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#14 ssmith

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Posted 13 January 2020 - 10:14 AM

Here is a recent photo taken through my C9.25.

 

Eta Cass C9 2x 10-11-19 avg 4fr.jpg

 

 

 

 


Edited by ssmith, 13 January 2020 - 10:21 AM.

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#15 payner

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Posted 13 January 2020 - 06:34 PM

Stunning image to my eyes, Steve. Thank you for posting.

 

Best,


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#16 tchandler

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Posted 31 January 2020 - 07:55 PM

Beauty of a double and one of the reasons that I so enjoy this pleasantly out of the way corner of the hobby.


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