Hemisphere:  Southern  ·  Constellation: Sagittarius (Sgr)  ·  Contains:  Eagle Nebula  ·  IC 1274  ·  IC 1283  ·  IC 1284  ·  IC 4685  ·  IC 4701  ·  IC 4715  ·  IC 4725  ·  Lagoon Nebula  ·  M 16  ·  M 20  ·  M 23  ·  M 24  ·  M 25  ·  M 8  ·  NGC 6494  ·  NGC 6514  ·  NGC 6523  ·  NGC 6526  ·  NGC 6559  ·  NGC 6611  ·  Part of the constellation Sagittarius (Sgr)  ·  Small Sgr Star Cloud  ·  The star 11Sgr  ·  The star 14Sgr  ·  The star 15Sgr  ·  The star 21Sgr  ·  The star 24Sgr  ·  The star 4Sgr  ·  The star 7Sgr  ·  And 4 more.
Mosaic: Milky Way Closeup (Astrotracer), 



    
        

            AlenK
Mosaic: Milky Way Closeup (Astrotracer)
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Mosaic: Milky Way Closeup (Astrotracer)

Technical card

Imaging telescopes or lenses: SMC Pentax-M 100mm f/2.8

Imaging cameras: Pentax K-3 II


Dates:Aug. 4, 2019

Frames: 47x30" ISO3200

Integration: 0.4 hours

Avg. Moon age: 3.89 days

Avg. Moon phase: 16.20%

Bortle Dark-Sky Scale: 4.00


Basic astrometry details

Astrometry.net job: 3980642

RA center: 18h 19' 24"

DEC center: -19° 39' 25"

Pixel scale: 16.116 arcsec/pixel

Orientation: 355.941 degrees

Field radius: 8.604 degrees


Resolution: 2413x2993

Data source: Traveller

Description

A two-panel mosaic of a portion of the summer Milky Way. The total exposure for the top half was 13 minutes while the total exposure for the bottom half was 10.5 minutes for a total of 23.5 minutes. The lens was stopped down to f/4. Tracking was done in-camera using the camera's Astrotracer feature, with the camera mounted directly to a tripod. No darks, bias of flat frames were applied. The area was in the middle of a light dome, hence extensive gradient reduction was required.

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Sky plot

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Histogram

Mosaic: Milky Way Closeup (Astrotracer), 



    
        

            AlenK