nebula tagged posts

MAS June Monthly Meeting

The Milky Way and Its Dark Nebulae – Walter Piorkowski

Dark nebula against rich starfield


This talk covers how the Milky Way is portrayed in charts and atlases, how to plan for and observe dark nebula and how these objects are cataloged. I will also show a selection of my 2×3 degree fields of the DN and discuss the “low extinction” windows in the Milky Way.


About the Speaker:
Walter Piorkowski is an amateur telescope and instrument maker. He is the former President and member of the board (14 years) of the Chicago Astronomical Society and Alder Planetarium (Chicago), Evening Courses instructor 1972 – 1980. He was Technical Support Adviser to Oberlin College’s CUREA program at Mt. Wilson observatory. Walter also was an Astro-Physics Mount Assembly Supervisor for 28 years.

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Trifid Nebula (M20)

Trifid Nebula (M20) – Photo by Jeffrey Shokler

The Trifid presents the unusual combination of an emission nebula, a reflection nebula, and a dark nebula all in one object! The Trifid lies 5,200 light years from us in the constellation Sagittarius.

Messier 21 (M21; NGC 6531) is the beautiful, small open cluster containing 57 stars that is visible to the upper left of the Trifid. M21 is 3,900 light years from us.

Canon 5D Mark II (astromodified; Baader UV/IR cut)
Stellarvue 130EDT (f7)
Celestron CGEM mount
1250 ISO
20x4min subexposures (80min/1.3hr total integration)
Guided (Lacerta MGEN II)
PixInsight (calibrated, registered, stacked, post-processed)
Photoshop (finish processing)

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Bubble Nebula (Caldwell 11)

Bubble_Nebula (Caldwell 11) - Photo by Laurence Mohr

Bubble_Nebula (Caldwell 11) – Photo by Laurence Mohr

Photo by Laurence Mohr. The Bubble Nebula (Caldwell 11) located ca. 10,000 light years away in the constellation Cassiopeia. The affect of the hot central star on the surrounding hydrogen gas is clearly visible – causing the gas to glow like a neon sign and forming it into a bubble with its stellar wind. 36 exposures at 10 min each; ISO 800; EdgeHD 1100; f/7; taken in Brooklyn, Wisconsin.

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