Good evening, everyone.
It was a windy Tuesday (14th January 2019) night in my back garden as I set up my William Optics 158 mm F/7 apochromatic refractor on its Berlebach Planet altazimuth mount. My finder scope is a William Optics 70 mm F/6 small apo. Mirror diagonals are fitted to both scopes. My north is to the left and my east is up. Seeing conditions were quite good.
All my figures are from www.stelledoppie.it
1. Sigma Cassiopeia was my first port of call. I have reported on it before, but what an exquisite delight it is. Astronomers are not quite sure if it is a true binary. The magnitudes are: A = 5. B = 7.2. Sep = 3.1". PA = 326 degrees. Perfectly split at 112X. Both stars appear to be white.
2. STTA 251 is supposed to be a triple optical star system. But I could not see the C star at all no matter what magnifications I used - up to 280X. According to stelle doppie, the magnitudes should be: A = 6.9. B = 9.1. C = 11.7. There is another star which has a magnitude of 9.5 very close by to the north. Its designation is TYC 3651 109. But that one does not appear to be of any concern to Stelle Doppie. It would be a D star if it was listed. So maybe we have a mystery. Comments are very welcome.
3. ES 1125 might be an uncertain double, but it is a good test for seeing conditions. The magnitudes are: A = 10.9. B = 11.1. Sep = 4.5". PA = 333 degrees. My scope managed to split cleanly at 140X and 167X. ES stands for Rev. Thomas Espin.
4. ES 2735 is a true binary. The magnitudes are: A = 8.9. B = 10.7. Sep = 12.6". PA = 99 degrees. I could just about split the 2 stars split at 40X. 112X was much more satisfying.
5. ES 1124 is an optical double star. The magnitudes are: A = 10.4. B = 10.9. Sep = 2.8". PA = 247 degrees. What an extremely attractive system it is! The 2 stars point downwards and were lovely and tight at 112X and 140X.
6. ES 700 is an uncertain double. The magnitudes are: A = 7.2. B = 11. Sep = 14.7". PA = 35 degrees. Good split at 112X.
7. ARY 33 is a true binary even though its separation is wide. The magnitudes are: A = 7.3. B = 8.1. Sep = 100.1". PA = 139 degrees. 40X is enough to see the 2 stars. But to check the colours I used 112X. The spectral classes are: A = G5. B = K2. Yellow and orange were the colours I observed. ARY stands for Robert Argyle.
I did observe one carbon star.
Please have a read on the Observational Astrophysics forum.
Thank you for reading.
Comments are very welcome.
Clear skies from Aubrey.