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S Coronae Borealis at record maximum

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S Coronae Borealis at record maximum was created by flt158

Hello everyone. 

Over on www.cloudynights.com a special announcement has been made. 
S Coronae Borealis is quite a bit brighter than its normal magnitude of +5.8. 
But right now it's +5.4 - and it may become even brighter. 
Of course once we get a clear night even low powered binoculars will see it. 
The star's spectral class normally varies between M6 to M8. 
But one observer reckons it is now M5. 
S Crb has been known to fade to +14.1 - fainter than Pluto!
Its period is 360 days. 
If we have clear skies on Monday I will seek it out. 
It ought to have an orange or red colour.   

Clear skies from Aubrey. 
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4 months 3 weeks ago #111315

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Replied by Fermidox on topic S Coronae Borealis at record maximum

Super Aubrey. Pretty amazing that R, S and T CrB are all of special interest.

Finbarr.
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4 months 2 weeks ago #111316

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Replied by flt158 on topic S Coronae Borealis at record maximum

Yes Finbarr. 
What an extraordinary small constellation Corona Borealis is!
Regarding its size it's the 73rd largest constellation in the entire sky - seriously small. 
And yet it has plenty of interesting stars within its boundaries. 
I have observed the only 2 carbon stars in it: R and V Crb. 
I've yet to observe S or T Crb. 
And there are plenty more M-class stars too. 

Right now we have so much cloud according to Met Eireann satellite image. 
But over in Limerick you're having plenty of sunshine, Finbarr. 
Maybe you will observe S Crb before any of us on the east coast. 
on www.aavso.org 2 observers are estimating its magnitude as +5.5, 

Clear skies from Aubrey. 
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4 months 2 weeks ago #111317

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Replied by Keith g on topic S Coronae Borealis at record maximum

Thanks guys, I'll check this star out once the clouds clear, also I have been looking at TCrb for years, another important star.

Keith.
If a telescope can fit into your backyard it's too small. If you can't move it, it's too big." -- John Dobson
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4 months 2 weeks ago #111318

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Replied by Fermidox on topic S Coronae Borealis at record maximum

That's right Aubrey, glorious day across Munster yesterday with temps touching 25C. I wasn't observing last night but will make an attempt tonight if clear.

Finbarr.
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4 months 2 weeks ago #111319

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Replied by Until_then-Goodnight! on topic S Coronae Borealis at record maximum

Nice thread gents, thanks for the updates!

Clear skies,
Darren. 


 
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4 months 2 weeks ago #111323

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Replied by Fermidox on topic S Coronae Borealis at record maximum

I observed S CrB last night and found it notably fainter than eta CrB. My estimate is mag 5.6

Clear skies,
Finbarr.
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4 months 2 weeks ago #111326

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Replied by flt158 on topic S Coronae Borealis at record maximum

Great job, Finbarr!
+5.6 sounds very good. 

We are being promised clear skies on Wednesday night. 
(I'm at a church party on Tuesday night). 
It's a guarantee that I will observe S Crb. 

Clear skies for this one, Aubrey. 
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4 months 2 weeks ago #111329

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Replied by flt158 on topic S Coronae Borealis at record maximum

Fermidox post=111326 userid=1800I observed S CrB last night and found it notably fainter than eta CrB. My estimate is mag 5.6

Clear skies,
Finbarr.

Hello again Finbarr.
I see eta Crb has a magnitude 5.6. 
It's an extremely tight binary - too tight for my apo refractor. 

Best regards from Aubrey. 

4 months 2 weeks ago #111330

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Replied by flt158 on topic S Coronae Borealis at record maximum

I'm not sure my post got through. 
Here it is again. 

Hello again, Finbarr. 
I see eta Crb has a magnitude of 5.6. 
It's an extremely tight binary - too tight for my apo refractor. 

Best regards from Aubrey. 

 
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4 months 2 weeks ago #111331

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Replied by Fermidox on topic S Coronae Borealis at record maximum

That's funny Aubrey, I did see mag 5.55 on Stellarium for eta CrB, but AAVSO says 4.99 and Wikipedia 5.02?

www.aavso.org/vsx/index.php?view=detail.top&oid=45678

Clear skies,
Finbarr.
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4 months 2 weeks ago #111332

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Replied by flt158 on topic S Coronae Borealis at record maximum

Yes, Finbarr. 
It all seems very confusing. 
Burnham states that eta Crb A is 5 and a half. B is 6.
Sissy Haas gives A as 5.6. B is 6.0. 
Guide 9.1 DVD varies from 5.0 to 5.6. B is 6. 
Simbad gives A as 5.6. 
Wikipedia gives A as 5.0. 

Who are we to believe?
If the experts cannot agree, then how can we suss it out?
Madness!
And we trying to estimate S Crb. 

Best regards from Aubrey. 



 
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4 months 2 weeks ago #111333

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Replied by flt158 on topic S Coronae Borealis at record maximum

Omicron Coronae Borealis is also nearby. 
Its magnitude is +5.5. 
Get that one right and eta Crb might get sorted. 
Chi Bootis' magnitude is 5.3. 

Clear skies from Aubrey. 

 
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4 months 2 weeks ago #111335

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Replied by Fermidox on topic S Coronae Borealis at record maximum

Well the U (ultraviolet) magnitude in Simbad is 5.6, but the V (visual) mag is 4.98. To me it 'looked' brighter than 5.6 but maybe not all the way up to 5... case unsolved Aubrey.

Finbarr.
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4 months 2 weeks ago #111337

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Replied by R Newman on topic S Coronae Borealis at record maximum

Tcrb

Discovered by John Birmingham of Millbrook Observatory, Co. Galway in 1866.. Will be giving a talk about Birmingham, Tcrb and his other observations at Millbrook in September.

Ronan Newman
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4 months 2 weeks ago #111341

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Replied by Fermidox on topic S Coronae Borealis at record maximum

Just read on the BAA forum about the unearthing of Birmingham's portrait Ronan, that's a remarkable discovery after all these years.

Finbarr.
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4 months 18 hours ago #111371

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Replied by R Newman on topic S Coronae Borealis at record maximum

Yes Finbar

Only took 150 years for the portrait to appear again....

Thanks for your help Finbar about JJ Fisher from Limerick will be mentioning him at my talk in Tullamore in September
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3 months 3 weeks ago #111392

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Replied by Fermidox on topic S Coronae Borealis at record maximum

Saw the video Ronan, very interesting talk. And thanks for the namecheck :D

Finbarr.
1 month 1 week ago #111550

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