Observations - 19th April 2020

1 month 1 week ago #108740 by flt158
Observations - 19th April 2020 was created by flt158
Hello everyone.

Would you believe it?
We still have another week of April 2020 to go and I have observed no less than 10 times so far.

On Sunday evening 19th April I set up my William Optics 158 mm F/7 apochromatic refractor and the WO 70 mm F/6 small apo in my back garden. I observed the heavens from 6 to 7 pm; and then again from 8.30 to midnight. Sunset occurred at 8.33 pm. Temperatures dropped from 16˚ C to 4˚C at midnight.

1. Of course, first on the menu was Venus. I found her with my small apo at 11X at precisely 6 pm which is a whacking 2 hours 33 minutes before sunset. At 6.10 pm I could see her with my unaided eye. Her magnitude is now a steady -4.7 with a distance of less than 76,300,000 kms from us. Her phase was 34.3% illuminated and had an angular diameter of 32.7” on this particular Sunday night. I have to say she is getting bigger as each week goes by. But that is perfectly logical as her distance is becoming less. Unfortunately, she is shimmering or “boiling” every time I observe her. This time she was doing so at lowly power of 40X. How sad! I refused to go higher than 167X, but I did notice those bright cusps once again at both ends of her poles even during the appalling seeing conditions.

Figures for these doubles, triples are from www.stelledoppie.it as per usual.

2. After dinner at 8.45 pm, I found Castor in my small apo at 11X. Switching over to the main scope using my 2 inch 28 mm eyepiece at 40X, the 2 brightest stars were split. This occurred 12 minutes after sunset – amazing! It is only the 2nd time I have achieved this feat. But I did increase my magnification from 112X up to 225X. Seeing conditions were clearly improving all the time. The C and D companions were visible at 40X at 9 pm. For the record, Castor’s magnitudes are: A = 1.9. B = 3. C = 9.9. D = 10.1. Sep’s from A are 5.4”, 69.8” and 179.8”. PA’s are 52˚, 163˚ and 221˚. A, B and D are all white. But C is red. How extraordinary! A, B and C are a true triple. But D is optical.

3. Off to Lynx once again. I did have a most excellent time in this elusive constellation. 38 Lyncis which is a true binary is as wondrous as ever - split at 112X. Magnitudes: A = 3.9. B = 6.1. Sep = 2.5”. PA = 229˚. The B star has starting to “point” downwards to the western horizon. The “teardrop” effect is particularly stunning at any magnification. Both stars are white. Of course those of us who have reflectors will see the B star pointing upwards. Never mind! It’s still a great sight.

4. Over on www.cloudynights.com we have been discussing 20 Lyncis. It is a true binary. Magnitudes: A = 7.5. B = 7.7. Sep = 14.9”. PA = 256˚. As usual it is effortlessly easy to split at 40X. But to check out those subtle hues, I went up to 167X. I had no problem figuring out the colours from 112X. A's spectral class A6 and it is blue-white. B is F0 and is yellow-white. That information is from Robert Burnham's Celestial Handbook. The “6” must refer to the strength of the blue colour of the primary. F always is yellow-white, but the “0” must make it a very weak yellow-white. That is my consensus. See what you think.

5. The rest of these 7 doubles are first timers for me. The first 3 are in a very confined space of 1 degree east of 20 Lyn. 22 Lyncis is an optical double. Magnitudes: A = 5.4. B = 10.1. Sep = 179.7”. PA = 304˚. This double has the alternative designation ENG 31. George Engelmann is the discoverer. He lived from 1809 to 1884. He was born in Frankfurt, Germany and emigrated to Baltimore, USA. It is very easy to see plenty of space in between the 2 stars at 40X. A is yellow-white (F6). B is white.

6. Stf 1091 is an optical double. Magnitudes: A = 9.5. B = 10.1. Sep = 29.9”. PA = 322˚. Very easily split at 40X of course and very similar in magnitude. Both stars are yellow – like 2 eyes.

7. What a difficult true double is right next to Stf 1091. I knew full well Stf 1093 was going to be one tough cookie to split. Magnitudes: A = 8.8. B = 9. Sep = 0.9”. PA = 206.4˚. The separation and the PA are increasing. I could see 2 stars at 225X. But no split was to be had at that power. However I could see the tiniest black space between the 2 stars at 280X and 320X alright – but only when the seeing conditions were decent. Thankfully the 2 stars are nearly identical in magnitude. There is the minimal delta magnitude difference of 0.2 – which proved to be a major advantage on this occasion.

8. The rest of these were easy to separate. Stf 1096 is a true binary. Magnitudes: A = 8. B = 10.6. Sep = 29”. PA = 327˚. 2 white stars clearly split at 40X.

9. ES 2622 is an optical double. Magnitudes: A = 8.2. B = 9.5. Sep = 46.7”. PA = 127˚. Split at 40X. A is a good yellow star alright (G5).

10. Stf 1032 proved to be a little challenge. It is both an uncertain and optical triple. Magnitudes: A = 7.3. B = 10.3. C = 9.5. Sep’s = 2.7” & 131”. PA’s = 113˚ & 319˚. At first I had all 3 visible at 167X. But I decreased my magnifications back to 140X and 112X. The B star proved to be very tight to the A star. All 3 stars are white.

11. Stf 1040 is a true binary. Magnitudes: A = 8.8. B = 10.3. Sep = 7.3”. PA = 261˚. Good and tight at 40X. Very pleasing at 112X too.

12. Finally to fill the page of my diary, I could see Porrima, otherwise known as Gamma Virginis, over my neighbour’s house. Magnitudes: 3.5 & 3.5. Sep = 2.9”. PA = 357˚. Of course, we all know of this hugely famous binary. Its separation is increasing and its PA is decreasing year on year. My scope is just about splitting it at 112X now. But what a glorious sight it is at 140X! Both stars’ spectral classes are F0. There are most certainly yellow-white for me.

And on that note I would like to thank everyone for reading this my latest report.

Comments are most welcome.

Clear skies from Aubrey.
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1 month 1 week ago #108741 by Fermidox
Replied by Fermidox on topic Observations - 19th April 2020
That's pretty amazing Aubrey, April has turned out to be a bumper month for clear skies. The Starlinks went over last night about 9.30 and apparently some of them were as bright as Procyon. Due over tonight again in a darker sky around 10pm.

Finbarr.
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1 month 1 week ago #108742 by flt158
Replied by flt158 on topic Observations - 19th April 2020
Hello again everyone.
Sorry to bother you with this news!
Would you believe it?
My printer has packed up!
So I won't be printing off any more maps which I get from Guide 9.
And I have to wait until 29th April to receive a new printer.
That's 9 or 10 days time.
I was trying to print off a map for my next carbon star ES Lyncis when this crisis occurred.
Such a nuisance.

Clear skies to everyone,

Aubrey.
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1 month 1 week ago #108744 by Fermidox
Replied by Fermidox on topic Observations - 19th April 2020
Here's a 2 degree fov from Stellarium Aubrey, if it's of any use. Only mag 11.8, a tough one.

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1 month 1 week ago #108745 by Until_then-Goodnight!
Replied by Until_then-Goodnight! on topic Observations - 19th April 2020
Hi Aubrey,

Brilliant reporting from you as always. Sounds like you had your 'Weetabix' yesterday! Very well done on observing seven new doubles - in one night too - wow!

Very many thanks for the details on Castor. The red star among the white ones sounds lovely. So, I must try take a look at them. Also, very well done, on splitting Stf 1093 - that must have felt great.

It will be interesting to read future reports on Gamma Virginis to find out how it affects what you do at the eyepiece.

The most interesting point I read from your observational report was observing Venus at 6pm - amazing!

Clear skies,

Darren.

BTW, sorry to read about your printer Aubrey, hopefully you'll be back up and running soon enough.
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1 month 1 week ago #108746 by flt158
Replied by flt158 on topic Observations - 19th April 2020

Fermidox wrote: Here's a 2 degree fov from Stellarium Aubrey, if it's of any use. Only mag 11.8, a tough one.


It turns out I can still find that carbon star, Finbarr. 
I already have a map printed which shows me the field star Hip 38325. 
So I'm going out to have a look right away. 
My scope is up and ready to go. 

Clear skies, 

Aubrey. 
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1 month 1 week ago #108747 by flt158
Replied by flt158 on topic Observations - 19th April 2020

Until_then-Goodnight! wrote: Hi Aubrey,

Brilliant reporting from you as always. Sounds like you had your 'Weetabix' yesterday! Very well done on observing seven new doubles - in one night too - wow!

Very many thanks for the details on Castor. The red star among the white ones sounds lovely. So, I must try take a look at them. Also, very well done, on splitting Stf 1093 - that must have felt great.

It will be interesting to read future reports on Gamma Virginis to find out how it affects what you do at the eyepiece.

The most interesting point I read from your observational report was observing Venus at 6pm - amazing!

Clear skies,

Darren.

BTW, sorry to read about your printer Aubrey, hopefully you'll be back up and running soon enough.


I will always recommend Castor and Porrima to anyone, Darren. 
Algieba is also a glorious binary too. 

Clear skies from Aubrey.  
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1 month 1 week ago #108748 by Fermidox
Replied by Fermidox on topic Observations - 19th April 2020
Quite a lot of action out there... half a dozen starlinks ranging from around mag 3.5 up to the brightness of Denebola, and one not far off matching Regulus. This last one seemed to be accompanied by a fainter companion moving parallel to the south. Another bright object appeared near Alphard at the predicted position of the Lacrosse 5 satellite and seemed to exceed the forecast mag of 1.4. Also a flare-like flash of less than a second directly overhead, possibly a Lyrid seen head-on. All within half an hour....

Finbarr.
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1 month 1 week ago #108749 by flt158
Replied by flt158 on topic Observations - 19th April 2020
It seems you are also having a "whale" of a time, Finbarr.
I'm so glued to the eyepiece I don't get to see the Starlinks spacecraft at all. Lacrosse 5 I have seen in the past.
Maybe the reason it does brighten is because of its solar panel(s) having its light bouncing off the Sun.

I will have a report tomorrow as to what I did observe on Monday night.

Are the clear skies going to continue for an indefinite period?
Surely not!

Aubrey.
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1 month 1 week ago - 1 month 1 week ago #108750 by Until_then-Goodnight!
Replied by Until_then-Goodnight! on topic Observations - 19th April 2020
Hi Aubrey and Finbarr,

I've just finished-up after a great session tonight. Observations last just under two hours (23:20 - 01:15 IST). I spotted one of those star links this evening when setting up my scope, and I believe I also saw that 'flare-like flash' you mention Finbarr but that was a bit later. 

Following on from your suggestion Aubrey, I observed Porrima, but I was unable to split it. In saying that I did observe a most beautiful double star tonight. It looked very much like a miniature version of Alberio in terms of the colours. I am not sure of its name. It seemed to form a equilateral triangle with the stars Muphrid and Vindemiatrix. I'm afraid I cannot do any better than that tonight. However, I'll attempt to observe it again at the next opportunity, and I'll aim to have a more accurate location.

I also spent a great deal of time revisiting Arcturus, M3, M53 again, and the two asterisms I viewed last week, particularly the hatchet shaped one. I find this a really useful starting point for star-hopping to M3, and M53.

In terms of the globular clusters, M3, looked much better tonight. Using several different eyepieces, the best view was to be had at 96X (25mm with 2X Barlow). The core was bright, and I managed to resolve some of the outer stars in the cluster. M53, was considerably fainter, and I failed to resolve any stars there.

To finish the evening I viewed TYC2590-1034-1 and  TYC2590-299-1 in Hercules. They looked like a double star, but I have since discovered they're not a true double - is that correct? I decided to leave M13 - got to leave something good for the next night out!

All the best, and long may these clear skies last,

Darren.
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1 month 1 week ago #108751 by flt158
Replied by flt158 on topic Observations - 19th April 2020
What a brilliant time you had on 20th April, Darren!

I am utterly surprised you could not split Porrima. How unfortunate that is!
Next time you might just make sure you have the correct star. It's the star at the centre of the "Y" of Virgo.

Please do check out that lookalike of Albireo you found. We would all be delighted to know what it was.

M3 and M53 are magnificent globular star clusters alright. Well done on locating them both.

Sadly I'm in the dark regarding those last 2 TYC stars. Guide 9.1 DVD places them both in Pisces. I'm sure there is an explanation somewhere.

There will be plenty of time to study M13 throughout the summer. M92 is another bright globular in Hercules.

Great report, Darren.
Please keep busy by providing many more reports each day on www.irishastronomy.org

I am now setting up my scope to repeat what I observed on Monday night.
I will definitely come back here tomorrow to share my findings. ES Lyn was found last night. Whoo hoo!

Clear skies,

Aubrey.
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1 month 1 week ago - 1 month 1 week ago #108752 by Fermidox
Replied by Fermidox on topic Observations - 19th April 2020

Until_then-Goodnight! wrote:  To finish the evening I viewed TYC2590-1034-1 and  TYC2590-299-1 in Hercules.


That seems to be quite a nice optical double Darren, although faint. In the same fov as epsilon Herculis but according to Simbad some 12 light years apart, so definitely not a double if those figures are accurate.

Finbarr.
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1 month 1 week ago #108755 by flt158
Replied by flt158 on topic Observations - 19th April 2020
Could you give us the designations, Finbarr?
I'm looking at Guide 9, but I'm not coming across our mysterious double.
Thank you.

Aubrey.
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1 month 1 week ago #108758 by Fermidox
Replied by Fermidox on topic Observations - 19th April 2020
Here is a Stellarium screenshot Aubrey, with the double marked. And the Simbad listings below -



simbad.u-strasbg.fr/simbad/sim-id?Ident=...min&submit=submit+id

simbad.u-strasbg.fr/simbad/sim-id?Ident=...min&submit=submit+id

Finbarr.
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1 month 1 week ago #108760 by flt158
Replied by flt158 on topic Observations - 19th April 2020
Hi Finbarr and Darren.

What do you know?
We do have a double star beside Epsilon Herculis.
As far as I can make out the Flamsteed designation is 58 Herculis. It is also called HLM 8. The most extraordinary news is that it is most definitely a true binary! Check out www.stelledoppie.it for the details.
The magnitudes are: A = 11.6. B = 11.45. Sep = 19.8". PA = 347 degrees.
This certainly is a Wow moment!
Your TYC designations are correct, Darren.
So well done to you.

So far I have not been able to discover who HLM refers to.
Any ideas, Finbarr?

Kind regards,

Aubrey.
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1 month 1 week ago #108761 by Fermidox
Replied by Fermidox on topic Observations - 19th April 2020
Eps Herculis actually is 58 Her according to Stellarium Aubrey, the double star is 2 arcminutes to the east. And if you search eps Her on stelledoppie it also returns 58 Her. So the fact it returns 58 Her for TYC 2590-1034-1 is a mistake I think. It could well be a true double though, those Simbad distances have a margin of error and the fact they are both in the 420-440 LY range is suspicious.

ELM was E Holmes, I presume the same astronomer who discovered the comet of 1892 which again outbursted in 2007.  

Clear skies,
Finbarr.
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1 month 1 week ago #108762 by Until_then-Goodnight!
Replied by Until_then-Goodnight! on topic Observations - 19th April 2020
Good morning Aubrey and Finbarr, 

Very many thanks for your replies. 

When I viewed Porrima through the eyepiece there were two other stars in the same FOV. These two stars were dimmer than Porrima, and had a similar magnitude to each other. For these reasons I thought I had split Porrima. However, when I went to confirm whether I had split the star by looking online at sketches and photos of what the split looks like, it seemed that the companion star was of a much brighter magnitude to either of those faint stars. I tried several eyepieces on it too, so maybe I was on the wrong star. Sure, I can give it another go! 

In terms of the double close to epsilon Herculis, you are both very kind for the efforts you are going to by supplying Stellarium screen shots of it, and info from www.stelladoppie.it , and Simbad. That is greatly appreciated gents!

And by the sounds of your most recent posts, it seems like we've stumbled across quite the enigma in this double star. One thing is sure - I'm looking forward to seeing where this conversation goes! 

Kindest regards, 

Darren. 
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1 month 1 week ago #108764 by flt158
Replied by flt158 on topic Observations - 19th April 2020
Eps Herculis actually is 58 Her according to Stellarium Aubrey, the double star is 2 arcminutes to the east. And if you search eps Her on stelledoppie it also returns 58 Her. So the fact it returns 58 Her for TYC 2590-1034-1 is a mistake I think. It could well be a true double though, those Simbad distances have a margin of error and the fact they are both in the 420-440 LY range is suspicious.

ELM was E Holmes, I presume the same astronomer who discovered the comet of 1892 which again outbursted in 2007.  

Clear skies,
Finbarr.

That is all very good, Finbarr. 
It is HLM 8 which is on www.stelledoppie.it
Somehow I don't think ELM is the same as HLM. 
But - no matter. We can all call it 58 Herculis from here on. 
58 Her is a Flamsteed designation. 
The only more important designation "in my book" is Bayer with the Alpha, Beta, Gamma and so on. 

Clear skies from Aubrey. 

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1 month 1 week ago #108765 by flt158
Replied by flt158 on topic Observations - 19th April 2020

Until_then-Goodnight! wrote: Good morning Aubrey and Finbarr, 

Very many thanks for your replies. 

When I viewed Porrima through the eyepiece there were two other stars in the same FOV. These two stars were dimmer than Porrima, and had a similar magnitude to each other. For these reasons I thought I had split Porrima. However, when I went to confirm whether I had split the star by looking online at sketches and photos of what the split looks like, it seemed that the companion star was of a much brighter magnitude to either of those faint stars. I tried several eyepieces on it too, so maybe I was on the wrong star. Sure, I can give it another go! 

In terms of the double close to epsilon Herculis, you are both very kind for the efforts you are going to by supplying Stellarium screen shots of it, and info from www.stelladoppie.it , and Simbad. That is greatly appreciated gents!

And by the sounds of your most recent posts, it seems like we've stumbled across quite the enigma in this double star. One thing is sure - I'm looking forward to seeing where this conversation goes! 

Kindest regards, 

Darren. 

What magnification did you use on Porrima, Darren?

I do have a new report for the last 2 nights coming up. 

Clear skies, Aubrey.  

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1 month 1 week ago #108767 by Until_then-Goodnight!
Replied by Until_then-Goodnight! on topic Observations - 19th April 2020
Hi Aubrey, 

Magnification at 37.5X, 48X, and 133X. Maybe I was on a different star. 

I'm looking forward to reading your reports.

All the best, 

Darren. 
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1 month 1 week ago - 1 month 1 week ago #108768 by flt158
Replied by flt158 on topic Observations - 19th April 2020
Hi Darren.
You will not be splitting Porrima at 37.5X or 48X at all.
But you will split it at 133X for sure.
In fact you ought to split at about 100X.
Please do check out the colour of both stars while you are observing Gamma Virginis. They are very good.  

We are having to go out for a walk right now.
So my astronomical report is still coming.

We've been onto Eir all morning.
They have been making a complete hames regarding our telephone bills.
That took up over 1.5 hours of our time!
I kid you not!

Skies are likely to be enduring high cloud on Wednesday night.

Best regards from Aubrey.
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1 month 1 week ago #108771 by Fermidox
Replied by Fermidox on topic Observations - 19th April 2020

flt158 wrote: It is HLM 8 which is on www.stelledoppie.it
Somehow I don't think ELM is the same as HLM.  


Ah good spot Aubrey, I should have said HLM stands for E Holmes. Which makes more sense actually. I will attempt to observe this 11th mag double tonight, but cloudy here at the moment.

Finbarr.
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1 month 1 week ago #108772 by flt158
Replied by flt158 on topic Observations - 19th April 2020
Hi Finbarr.
I wish you every success in splitting 58 Herculis.
It's also interesting to note that component A is slightly fainter than B.
Perhaps the reason for that is A is might be nearer to us than B.

Who knows?

Clear skies,

Aubrey.
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1 month 1 week ago #108775 by Until_then-Goodnight!
Replied by Until_then-Goodnight! on topic Observations - 19th April 2020
First the printer, now the phones; one more for the hat-trick Aubrey! Seriously though it can be excruciating trying to deal with telecom companies... Hope its all sorted. 

Many thanks for providing those magnification details Aubrey. 

Best of luck with that double star Finbarr, do let us know how you get on. 

Clear skies to you, 

Darren. 
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1 month 1 week ago #108781 by flt158
Replied by flt158 on topic Observations - 19th April 2020
Hey, lads.
Our new printer is supposed to be arriving today Thursday via UPS.
We hope so.

Kind regards,

Aubrey.
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