Hello, enthusiasts of carbon stars.
I set up my William Optics 158 mm F/7 apochromatic refractor in my back garden on Tuesday 16th February 2021 to seek out the carbon star TYC 660 420 which is also known as DO 616.
The Hipparcos satellite is responsible for the TYC designation. Whilst the DO designation refers to the Dearborn Observatory in Illinois, USA.
I hope I'm correct on both those issues. Please correct me if I'm wrong.
The Right Ascension (RA) of TYC 660 420 is: 3 hours 37 minutes and 43.94 seconds.
The Declination (Dec) is +11 degrees 13 arc minutes and 37.6 seconds.
Some time ago I downloaded an Excel Spreadsheet which is set out in order of each of these carbon stars' RA starting at 00 Hours and finishing just short of 24 hours.
Therefore it starts and ends in Cassiopeia.
The C spectral class star TYC 660 420 is positioned in western Taurus near the double star AG 68 and I did print a detailed map from my Guide 9.1 DVD before I observed it.
It is the very first carbon star I came across from the western side of Taurus in the lowest RA.
On this map I had to observe 4 stars which are arranged in slightly curved line.
These stars and their magnitudes were TYC 660 410 (11.6), TYC 660 579 (11.8) and TYC 660 519 (10.5)
The target star is seriously faint at magnitude 11.3.
But it presented itself at a very reasonable 112X between the first 2 stars above.
As I increased to 225X the star did have a fairly decent orange colour.
I was overjoyed when I had it all figured out.
DO 616 or TYC 660 420 is my 96th observed carbon star.
Other carbon stars I have observed in the past in Taurus were: TT, TU and Y Tauri.
So it is nice to add a 4th.
I do promise the next carbon in Taurus will be a brighter one.
Thank you for reading this report.
Comments, corrections and images are very welcome.
Clear skies from Aubrey.