NGC 6254 or Messier 10 in Ophiuchus

NGC 6254, M10, is a globular cluster with a spacial diameter

of 83 ly.  It is found in the constellation Ophiuchus.

M10 is estimated to contain 100 000 stars

and is located 14.3 kly from us.

Hover over the picture for an annotated version

Date:  19 May and 27 June 2024

FOV:  cropped to 45' × 30'; the angular size of M10 is about 20'

Telescope:  Stellarvue SVX102T + SFFX-1 (737mm, f/7)

Guiding:  ZWO ASI120MM mini mono guide camera,

Stellarvue F050G 50mm guide scope

Computer:  ASIair pro Raspberry Pi

Mount:  iOptron CEM40

Camera:  ZWO ASI6200 Pro Cooled (-10°C) Color CMOS with gain 100, 19 May

ZWO ASI071 Pro Cooled (-10°C) Color CMOS with gain 90, 27 June

Pixel size:  3.76 μm

Resolution:  1.052 arcsec/pixel

Filter:  none 19 May and Baader semi-APO filter 27 June

Stacking:  ninety-one 240 second frames using Pixinsight

41 frames 19 May 2024

50 frames 27 June 2024

Calibration:  20 darks, 20 flats, 20 dark flats for each session

Total Time:  6 hours 4 minutes

Processing:  Pixinsight – DynCrop, SPCC, DBE, SPCC, BlurXT, NoiseXT,

HST, GHS, MStr, PMath MStr + GHS + HST, Sat, Scale

Location:  Darling Hill Observatory near Vesper, NY