After 2 weeks 2 days, I finally got a clear night!
And it is my 50th observing night of 2020.
I find that very difficult to believe!
On the east coast of Dublin, Ireland our Sun sets at 21.57.
But I did my utmost to set up my William Optics 158 mm apochromatic refractor in the back garden on its Berlebach alt-az mount on this particular evening.
Having observed the Moon for over an hour, I set out to observe 3 doubles and 1 triple star all within the confines of Corona Borealis from 11 pm to midnight.
Success was to be had with each one I observed.
All are south of Iota Crb.
All figures can be found on www.stelledoppie.it
1. STF 2029 which is a true binary and is west of Upsilon Crb. Magnitudes: A = 8. B = 9.6. Sep = 6". PA = 187 degrees. Nice easy split at 112X of course. But I thereafter I found I easy split it at 40X. I did increase to 167X and I was soon to notice that B had an orange hue. A was white. This was the only time I saw an orange star during this hour.
2. STF 2022 is also a true binary. Magnitudes: A = 6.5. B = 10. Sep = 2.5". PA = 153 degrees. This is a reasonably tough double to split. But 167X and 225X did it justice I am very happy to say. The delta mag of 3.5 had to be overcome. By the time I successfully split it there was already a decent black gap between the 2 stars. The colours are yellow-white and white. So nothing fancy here with the colours. However I did admire the view all the same.
3. STF 2011 is the only triple of the night. And it seems that all 3 stars are uncertain binaries. Magnitudes: A = 7.9. B = 10.2. C = 9.5. Sep = 2.7" and 118.1". PA's = 67 and 350 degrees. A and C were easily split at 40X of course. But to see the B star 112X gave a good tight split. At 140X was a delightful split too. All 3 stars were white to me.
4. Finally, I observed an uncertain double called AG 349. Magnitudes: A = 9.6. B = 10.9. Sep = 11.7". PA = 228 degrees. A dim pair but nicely split at 112X. AG stands for Astronomische Gesellschaft.
So there you have it. Nothing terribly exciting this time.
But I was so relieved to do some observing.
Now our friend Rich observed a double called Lambda Crb recently.
And I see where it is located.
So I have since discovered there are 4 more doubles in Corona Borealis for me to seek out.
After that the Northern Crown and I can go our separate ways.
But what an amazing constellation it truly is!
Comments are very welcome.
I wish you all clear skies from Aubrey.
Edited by flt158, 26 June 2020 - 06:19 AM.