Hemisphere:  Northern  ·  Constellation: Draco (Dra)  ·  Contains:  NGC 5905  ·  NGC 5908
NGC5905 and NGC5908 - A Nice Pair, 


            Jason Guenzel
NGC5905 and NGC5908 - A Nice Pair
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NGC5905 and NGC5908 - A Nice Pair

Technical card

Imaging telescopes or lenses: CELESTRON EdgeHD 800

Imaging cameras: ZWO ASI1600MM-Cool

Mounts: Orion Atlas Pro AZ/EQ-G

Guiding telescopes or lenses: CELESTRON EdgeHD 800

Guiding cameras: ASI120MM

Focal reducers: Celestron 0.7x Focal Reducer

Software: Sequence Generator Pro  ·  PixInsight  ·  Adobe Photoshop

Filters: Astronomik Deep-Sky R 1.25"  ·  Astronomik Deep-Sky G 1.25"  ·  Astronomik Deep-Sky B 1.25"  ·  Astronomik L-3 UV-IR Block 1.25"  ·  Astronomik H-alpha 6nm CCD 1.25"

Accessory: Moonlite CHL 2.5" Large Format Crayford Edge Focuser  ·  Orion Thin Off-Axis Guider (TOAG)

Dates:April 23, 2019April 24, 2019April 27, 2019May 6, 2019May 15, 2019May 16, 2019May 24, 2019May 27, 2019June 3, 2019June 8, 2019June 11, 2019June 23, 2019June 26, 2019July 4, 2019

Astronomik Deep-Sky B 1.25": 30x120" (gain: 76.00) -20C bin 1x1
Astronomik Deep-Sky G 1.25": 30x120" (gain: 76.00) -20C bin 1x1
Astronomik Deep-Sky R 1.25": 30x120" (gain: 76.00) -20C bin 1x1
Astronomik H-alpha 6nm CCD 1.25": 50x240" (gain: 139.00) -20C bin 1x1
Astronomik L-3 UV-IR Block 1.25": 280x90" (gain: 76.00) -20C bin 1x1

Integration: 13.3 hours

Darks: ~50

Flats: ~50

Bias: ~256

Avg. Moon age: 13.52 days

Avg. Moon phase: 49.92%

Bortle Dark-Sky Scale: 5.00

Basic astrometry details

Astrometry.net job: 3120658

RA center: 15h 16' 4"

DEC center: +55° 28' 4"

Pixel scale: 1.133 arcsec/pixel

Orientation: 21.149 degrees

Field radius: 0.272 degrees

Resolution: 1080x1350

Data source: Backyard


These two demonstrate just how different spiral galaxies can look. Spirals come in many shapes and sizes and on top of that, are always viewed from different angles.

NGC5905 is a barred spiral viewed nearly face on. It is defined by a central bar that is perpetually recycling matter into new stars, seen here with a golden hue. This bar is wrapped with spindly, somewhat distorted arms containing massive stars shining a bright blue. The spaces in-between these main features are loaded with a more ruddy and diffuse cloud of older stars.

In a stark contrast, NGC5908 is a lenticular galaxy. It is somewhat of a hybrid between an elliptical and spiral-type. It has a coherent central disk that is capped by a dark dust lane. This is sitting within an enormous halo of aged stars, giving rise to the overall yellow hue. To my surprise, a bit of blue exists in the halo, making this one a little different. ⠀⠀⠀⠀⠀⠀⠀⠀⠀
These two are true galactic neighbors and lie somewhere around 140 million light years away toward the constellation Draco. The background is littered with galaxies ... including one over 11 billion light years distant. I’ll try to point that out in a subsequent post. We are small.

Enjoy... and let me know what you think in the comments