Norman
October 20th, 2017, 11:33 AM
Hi folks,
recently i spent some hours on M 31. One thing i tried was V 19 - the brightest star in M 31. These days of magnitude 16m2...
http://www.astronomerstelegram.org/?read=10752
At powers around 300x reference stars and region was not resolved good enough yet. At 425x all important neighbour-stars become visible and background dark enough.
Already after a few seconds the star easily occured in averted vision! It was no permanent view in averted vision, but appeared easily again and again.
It was definately no threshold object for 12" at this time.
Look at this link and table in the second half:
http://www.baader-planetarium.de/projekt-andromeda/htm/n-andromeda_grenzgroesse.htm
Star Nr. 16 in the table was visible (phot. Mag. 17.03).
NELM something between 6m5-6m8, humidity 50%, 6600ft high. Seeing very good, no wind.
Anyone else tried this?
Maybe even someone with 10"?
CS!
Norman
recently i spent some hours on M 31. One thing i tried was V 19 - the brightest star in M 31. These days of magnitude 16m2...
http://www.astronomerstelegram.org/?read=10752
At powers around 300x reference stars and region was not resolved good enough yet. At 425x all important neighbour-stars become visible and background dark enough.
Already after a few seconds the star easily occured in averted vision! It was no permanent view in averted vision, but appeared easily again and again.
It was definately no threshold object for 12" at this time.
Look at this link and table in the second half:
http://www.baader-planetarium.de/projekt-andromeda/htm/n-andromeda_grenzgroesse.htm
Star Nr. 16 in the table was visible (phot. Mag. 17.03).
NELM something between 6m5-6m8, humidity 50%, 6600ft high. Seeing very good, no wind.
Anyone else tried this?
Maybe even someone with 10"?
CS!
Norman