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Contains:  Eagle nebula, Hourglass nebula, IC 1287, IC 4701, IC 4715, IC 4725, Lagoon nebula, M 16, M 17, M 25, M 7, M 8, NGC 6357, NGC 6383, NGC 6475, NGC 6523, NGC 6526, NGC 6604, NGC 6611, NGC 6618, Omega nebula, Part of the constellation Sagittarius (Sgr), Part of the constellation Serpens (Ser), The constellation Scutum (Sct), The star Alnasl (γ2Sgr), The star Ascella (ζSgr), The star Kaus Australis (εSgr), The star Kaus Borealis (λSgr), The star Media (δSgr), The star Nunki (σSgr), The star ηSer, The star θOph, The star νOph, The star φSgr
Getting plate-solving status, please wait...
Milky Way - Sagittarius - 35mm, 



    
        

            Matt Stahl
Milky Way - Sagittarius - 35mm
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Milky Way - Sagittarius - 35mm

Technical card


Dates:July 7, 2018

Frames: 40x120" ISO800 (gain: 1.12)

Integration: 1.3 hours

Darks: ~30

Flats: ~60

Bias: ~100

Avg. Moon age: 23.31 days

Avg. Moon phase: 37.78%

Bortle Dark-Sky Scale: 5.00

Mean FWHM: 49.88

Temperature: 13.90


Basic astrometry details

Astrometry.net job: 2146836

RA center: 18h 13' 39"

DEC center: -18° 10' 12"

Pixel scale: 25.587 arcsec/pixel

Orientation: 359.694 degrees

Field radius: 22.018 degrees


Resolution: 3422x5164

Locations: Beaver River School House Road, Richmond, RI, United States

Data source: Traveller

Description

Still getting the hang of AP...

35mm f/2.8 @ ISO 800. I wanted to see if I'd get less noise than at 1600, especially in warmer temps, and if stopped down from 1.4 I'd get sharper edges.

Swapped battery 1/2 way through, but didn't take my time reframing so had to discard an hour of subframes since stacking them together introduced a hard edge that even if I was successful eliminating, I suspect would have degraded the whole image.

There was 90% humidity so dew certainly degraded the images; I cleaned the lens towards the end of the 1st hour. (I need to pay closer attention in high humidity - say, check every 15m and clean as needed until I get a dew heater).

I'm pleased to see the lagoon (m8) and trifid (m22) nebulas, as well as the eagle (m16) and omega (m17) nebulas, have a little detail (for a wide lens), and some color (for an unmodified DSLR).

Saturn also snuck in there :-)

Comments

Author

mgstahl
Matt Stahl
License: None (All rights reserved)
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  • Milky Way - Sagittarius - 35mm, 



    
        

            Matt Stahl
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    Milky Way - Sagittarius - 35mm, 



    
        

            Matt Stahl
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Milky Way - Sagittarius - 35mm, 



    
        

            Matt Stahl