Imaging telescopes or lenses: Takahashi TOA 150
Imaging cameras: Pentax 645z Mod
Mounts: Takahashi EM-400 Temma2
Guiding telescopes or lenses: SharpStar 50 ED
Guiding cameras: ZWO ASI290MM Mini · Fishcamp Starfish
Focal reducers: Takahashi TOA 67 Flattener
Software: PixInsight · RegiStar · Photoshop CC
Filters: H alpha
Dates:Nov. 5, 2016 , Jan. 3, 2017 , July 19, 2018 , Sept. 3, 2018
Frames:
338x480" ISO800
40x60" ISO800
H alpha: 40x300" ISO12800
H alpha: 23x720" ISO800
Integration: 53.7 hours
Avg. Moon age: 9.95 days
Avg. Moon phase: 36.40%
Bortle Dark-Sky Scale: 2.00
Astrometry.net job: 2275710
RA center: 0h 42' 43"
DEC center: +41° 16' 4"
Pixel scale: 1.348 arcsec/pixel
Orientation: 270.183 degrees
Field radius: 2.342 degrees
Resolution: 10962x6027
Locations: Mt. Shiao-Shuei (Taiwan), Taichung, Taiwan; Mt. Ho-Huan (Taiwan), Taichung, Taiwan
Data source: Traveller
This is a three-frame mosaic. The mosaic panels have large overlaps. The exposures were taken over 16 different nights over three years (July 2016 to Sep 2018). Most of them were taken under good seeing. Those taken under poor seeing were discarded or given low weights in the mosaic.
The exposures were Bayer-drizzed plus 2x-drizzle stacked in PixInsight. As a result, the final mosaic has a dimension of 31320 x 17220 (539 mega pixels). The version uploaded here is reduced by 0.35x (equivalent to 0.7x the camera's native pixel size) to avoid overloading some browsers. To see a pan/zoomable higher-resolution version (0.6x reduction), you can visit this page:
http://www.gigapan.com/embeds/xp5Hj6H2dlw/
Rev A (final) is the regular RGB image.
Rev E is a starless version, just for fun. Obviously the many background galaxies, and star clusters and compact HII regions in M31 are also removed.
Rev F is an inverted black and white image with strong stretch, to show the faint outer halo and stellar streams around M31.
| Deep Sky Mosaics |
| Images of Taiwan |
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