Jewel Box Open Cluster NGC4755
29-Mar-2016
The Jewel Box, Kappa Crucis Cluster, NGC 4755, is an open cluster in the constellation Crux. This cluster is one of the youngest known, with an estimated age of 14 million years. It is located 6,440 light years from Earth, and contains around 100 stars.
Image:
- 98x 45s Red bin2x2 + 25 flat + 50x dark + 120x bias
- 114x 45s Green bin2x2 + 25 flat + 50x dark + 120x bias
- 68x 45s Blue bin2x2 + 25 flat + 50x dark + 120x bias
Total integration 3 hours 30 minutes.
Hardware:
- Celestron EdgeHD 1100
- SkyWatcher EQ8 Pro Mount
- QSI 683-wsg Camera @ -15°C
- Astronomik Typ 2c RGB filters
- Orion StarShoot Autoguider
- Foresight Innovations On Axis Guider
- Starlight Xpress Adaptive Optics
Location:
- Orange zone in Brisbane, Australia. (Bortle 7)
- Average seeing + waning gibbous moon phase.
Software:
- Planning & camera alignment with Aladin 9
- Captured with AstroArt 6
- Guiding with PHD2 + PHD_Dither
- CCDInspector: Image analysis & rejection
- CCDStack 2+: Calibrate, align, stack, combine RGB.
- Astra Image 4.0: Deconvolution
- Photoshop CC: Noise reduction, minimum filter, curves, saturation.