M 28

60%  resolution (2.5MB)

DSLR widefield image

Object data of M28

Object type: Globular star cluster (IV)
Size: 11.2'
Magnitude: 7.7 mag
Constellation: Sgr
Distance: 18,000 Ly
Notes: At about 18,000 light years distance, Messier 28 with its linear diameter of 60 light years appears considerably smaller and more compressed than its more impressive neighbour M22. In 1986, M28 became the first globular cluster where a millisecond pulsar was discovered (by the Lovell Telescope at Jodrell Bank Observatory).

Exposure data

Date: 2015-10-07 + 09 + 10 + 11
Location: Hacienda Los Andes / Chile (1100m)
Telescope: TEC RC 20" f/9 with corrector (f=4492mm)
Camera: FLI PL16803 with Astrodon filters
Binning: L 1x1 RGB 1x1
Mount: Astro-Physics AP1600GTO
Exposure time: L 36x2min / R 12x2min / G 12x2min / B 12x2min
Exposure time total: 2h 24min
Notes: Image acquisition by CEDIC team (Bernhard Hubl, Christoph Kaltseis, Markus Blauensteiner)

Image processing by Bernhard Hubl