Venus + double star

4 months 2 weeks ago #108325 by flt158
Venus + double star was created by flt158
Get out quick!

Venus and Zeta Piscium are less than 2 degrees apart.
Zeta Psc is true binary.
I can split it at 11X.

Aubrey.
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4 months 2 weeks ago #108329 by Until_then-Goodnight!
Replied by Until_then-Goodnight! on topic Venus + double star
You're kidding me!

I'm just seeing this now...it might be too late for me.

Not to worry...thanks for notifying us Aubrey, and I'm looking forward to reading your report on the event.

Clear skies,

Darren.
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4 months 2 weeks ago #108330 by Fermidox
Replied by Fermidox on topic Venus + double star
Couldn't see a thing with the driving snow.....
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4 months 2 weeks ago - 4 months 2 weeks ago #108331 by flt158
Replied by flt158 on topic Venus + double star
Good evening, one and all.

It was such a biting wind on Tuesday night.
The temperature was 2 degrees Celsius.
But because of the severe wind chill, it turned out to feel like -2.
I had 6 layers on.
The William Optics 158 mm apochromatic refractor was reasonably sturdy - but not always.

1. A 2 day old Moon was sinking behind some distant leafless trees and I could not name one crater. They were all too small - even at 40X. The Moon's magnitude was -4. It was gone by 6.30 pm.
2. Then there was Venus whose magnitude was -4.3. How about that?? Venus brighter than our Moon!! Venus was sporting a gibbous phase - 65% illuminated. It was 18.1" wide. (This information is from Guide 9.1 DVD). 112X was sufficient to see her gibbous phase.
3. And then I could see Zeta Piscium split at 11X and 40X. The magnitudes are: A = 5.2. B = 6.3. Sep: 23.2". PA = 63 degrees. I had observed this true binary before; but never with Venus so close to it. Both objects were 1.5 degrees apart.
4. I spent some time on the triple star Castor (Alpha Geminorum). I was nearly splitting A and B at 40X. But 112X is excellent to seeing A, B and C. The magnitudes are: A = 1.9. B = 3.0. C = 9.8. Sep = 5.3" and 70". The PA's = 52 degrees and 163 degrees. There is a wider D star, but it is not part of the system.
5. I was waiting to head into Cancer the Crab which is further east of Gemini. M44 - the Beehive open cluster was nice at 40X.
6. Tegmine (Zeta Cancri) is my favourite triple star. The scope manged to split it at 225X even in the blustery conditions. Indeed at 167X I could see 3 stars; but A and B were not quite split at that power. At 40X there was no problem seeing A and C. Stelle Doppie informs us that A and B are getting tighter bit by bit as every year goes by. The magnitudes are: A = 5.3. B = 6.3. C = 5.9. Sep's = 1.142 and 5.9". PA's = 8.4 degrees and 64 degrees.In 2021 A and B will be even tighter: 1.14".
7. I headed south to Epsilon Hydrae. The star doesn't have a name. But a fine true binary it is. Magnitudes: A = 3.5. B is not visible (It is too close for us).C = 6.7. Sep = 2.8". PA = 310 degrees. I needed 140X to split it. 167X was even better. A is yellow white. B is slight blue. I had no split at 112X. Maybe on a less windy night I could.

The rest of these are on Cancer.

8. A 2963 is a charming true binary. Magnitudes: A = 9.3. B = 10.9. Sep = 3.5". PA = 264 degrees. A is yellow white. B is orange. My scope had a successful split at 112X. There was no need to go higher.
9. J 735 is my very first Jonckheere double star. It is a true binary and very faint too. Magnitude of both stars is 10.2. Sep = 2.8". PA = 339 degrees. Clean split at 112X, 140X and 167X; but only when the wind tried to die down. A is yellow. B might be a bit red. I need to revisit it.
10 My carbon star of the entire evening: TYC 223-509-1. It is seriously faint at magnitude 10.3. Its spectral class is C. I could just about see a reasonable but definite orange - not too strong. It is my 3rd carbon star in Cancer after T and X Cancri. Those 2 are far brighter. I have now observed 81 carbon stars in the whole sky. There are more carbons in Cancer to come. 

Thank you for reading.

Comments are very welcome.

Clear skies,

Aubrey.
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4 months 2 weeks ago #108333 by Until_then-Goodnight!
Replied by Until_then-Goodnight! on topic Venus + double star
Hi Aubrey,

I very much enjoyed reading your report from last night's session. Unlike me, it seems that you had a good night: Not one Galaxy, but I did get to observe Mizar and Alcor before the clouds blew in. So, I was delighted to read your report.

Your description of Venus was intriguing insofar that it was brighter than the Moon yesterday. 

I did not realise that Castor was a triple star - thanks for that Aubrey! Also, Zeta Cancri is new one for me...you never fail to enlighten us. 

The colours of A 2963 sound lovely, as do J 735 A and B. Thanks to you I did a little reading on Robert Jonckheere: what an interesting story!

And congratulations on observing you 81st carbon star; I'm looking forward to hearing what ones you observe next.

Until then, clear skies,

Darren.
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4 months 2 weeks ago #108336 by Fermidox
Replied by Fermidox on topic Venus + double star
Have you a specific goal to observe as many carbons as possible Aubrey, or are they just an attractive target as you're starhopping? There's a nice list of 'easy' carbons here but I'm sure you're aware of it:

www.astrosurf.com/buil/us/peculiar2/carbon.htm

Finbarr.
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4 months 2 weeks ago #108338 by flt158
Replied by flt158 on topic Venus + double star
 Hi Finbarr. Thank you for your question.

The list I got over on www.cloudynights.com is this one: 2343 Carbon stars brighter than Mag. 13 . 

Apologies it does not open on our website. I just copied and pasted it.  
A guy called Eric (Cildarith) sent it to me originally nearly one year ago in April 2019.
Of course the list is huge. 
And a lot of these carbon stars are not visible from Ireland at all for one reason or another. 
Some are too low and some are too faint. 
So I very slowly work my way through them. 

I simply pick a constellation and find the right ascensions and declination of that constellation using the list. 
For instance, Cancer ranges from 7 hours 55 minutes in RA to 9 hours 21 minutes. Declination ranges from +33 degrees north to +6 degrees north.
Needless to say I don't rush!!
I locate the star. Then print off a map using my Guide 9.1 DVD. 

But to answer your original question: to observe 100 would be nice. 
And It would be nice to find a decent carbon star as number 100. 

I haven't come across your list before. Not that I can remember. 
But all lists regarding these fascinating stars are always worthwhile. 

By the way, I don't think there are many more carbon stars for me to find in Cancer. 
There might be 2 or 3 more. 
But V Cancri appears to be far too faint right now according to www.aavso.org   

Clear skies to you, Finbarr. 

Aubrey. 
 
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4 months 2 weeks ago #108339 by Fermidox
Replied by Fermidox on topic Venus + double star
Excellent. Here is a table showing how many stars are visible down to each magnitude:

www.stargazing.net/david/constel/howmanystars.html

Then if we round off the number of stars above mag 13 we get some 12.5 million. So, fewer than 1 in every 5,000 stars is a carbon star!

Clear skies,
Finbarr.
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4 months 2 weeks ago #108343 by flt158
Replied by flt158 on topic Venus + double star
That is most interesting, Finbarr.
Thank you for your willingness to share these good facts with the rest of us.

Clear skies,

Aubrey.
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4 months 5 days ago #108371 by Fermidox
Replied by Fermidox on topic Venus + double star
And tonight Venus 2.2 degrees NW of Uranus. The 7th planet is 24 times more distant and 12,000 times fainter.



Finbarr.
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4 months 5 days ago #108373 by Until_then-Goodnight!
Replied by Until_then-Goodnight! on topic Venus + double star
What a nice photo Finbarr. Thanks for sharing it with us. 

Clear skies, 

Darren. 
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