Comet C/2009 P1 (Garradd) in Globular Cluster M71 (NGC 6838), class X-XI, in Sagitta

LRGB combination (Click for a larger view 1200 x 1200 px)


Comet C/2009 P1 (Garradd) and globular cluster M71 Globular Cluster M71 (NGC 6838), class X-XI, in Sagitta

Messier 71 (M71, NGC 6838) is a loose but beautiful globular cluster in the small but nice constellation Sagitta.

Right Ascension 19 : 53.8 (h:m)
Declination +18 : 47 (deg:m)
Distance 1.25 (kly)
Visual Brightness 8.2 (mag)
Apparent Dimension 7.2 (arc min)

Seeing: Good - Pickering 7 rating
Optic(s): TL APO 90/600 @ f/6.7
Mount: ASA DDM 85 - operated by my friend Emil Ivanov
Camera: Artemis Art 4021 - monochrome CCD camera – 2048 x 2048 px ; 16x16 mm; 7.4 µm x 7.4 µm
Filters: Astronomics LRGB Set, SupaSlim TrueTechnology Computerized Filter Wheel
Dates/Times: 2011-08-27
Location: Rozhen Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exposure Details:

LRGB: L (IR cut): 9x1 min (1x1 binning), R, G and B: 9x1 min each of colours (1x1 binning), Total ExposureTime - 36 min

More details: Dark calibrated
Guiding: SBIG STL-11000M internal sensor and 12" ASA Astrograph

MaxIm DL / AIP4Win / PSCS5


All Contents copyright Velimir Popov unless otherwise noted.