| 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.
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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.
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