Home Index page Previous image Next image
Click to view the full size image:
1458 x 1070, 922 KB

Classification: Globular cluster / PAL-13
Constellation: Pegasus (PEG)
Object Location: Ra 23h 07m 28s Dec +12° 50’59° (current)
Size & Distance: 1.8 x 1.8 Apx 82,100 light years.

Date & Location: 6-19-2009, Palomar Mountain, CA
Exposure: LRGB L= 6 @ 5min. (bin 1x1), RGB= 3 ea, @ 5min. (bin 2x2)
Optics: Telescope Engineering Company APO140ED f/7 980mm
Mount: Astro-Physics 900 GTO / ATS 10x36 Pier
Camera: SBIG-ST10XME, CFW10
Filters: Astrodon Gen2 LRGB
Software: MaxImDL 4.56, Photoshop CS

Notes: Sky conditions: Good seeing, Light wind, Temp 58°
Image Field of view is 49 x 67 arcmin.

PAL 13 in Pegasus is a globular cluster with a weakly concentrated core. It is characterized with a surface brightness of 17.7, thus making it one of the dimmest globular clusters within the PAL catalog as well as the Milky Way and which represents a very formidable challenge for observers with large-aperture instruments. Its apparent diameter of approximately 1.8 arc-minutes makes PAL 13 also one of the smallest members within the PAL catalog. PAL 13 lies at an impressive average distance of 82,100 light-years away, thus making it a galactic halo globular cluster within the Milky Way. A recent study found PAL 13 to be 10.5 + 1.0 billion years old! PAL 13 was discovered by American astronomer A.G. Wilson in 1953.