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Going for IC417, Joe Matthews
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Going for IC417

Revision title: IC417 and NGC1931

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Going for IC417, Joe Matthews
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Going for IC417

Revision title: IC417 and NGC1931

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I thought I had at least 5 to 6 hours of clear sky, but I only got about 3 hours and it doesn’t look like I will have the opportunity for more time anytime soon.  However, I plan to image IC417 once the weather clears and will combine the data for a better image later.

IC417 and NGC1931:

NGC 1931 and IC 417 are found just west of the star cluster M 36 in the ancient northern constellation Auriga - a region where star clusters and nebulae abound. An imaginative eye toward the expansive IC 417 and diminutive NGC 1931 suggests a cosmic spider and fly.  The entire cluster/nebula complex appears only 3 arc mininutes across. About 10,000 light-years distant, both open star clusters are young, formed in interstellar clouds, and still embedded in glowing hydrogen gas. The more compact NGC 1931 is about 10 light-years across, with contrasting blue hues characteristic of reflected starlight.NGC 1931 is a mixed emission-reflection nebula with a core of young white-hot stars. The nebulosity is listed as Sharpless 2-237. At its center are four stars in a Trapezium-like configuration. For this reason, NGC 1931 has been referred to as a "miniature version of the Orion Nebula". Its brightest class O and B stars will possess short, dramatic lives, while the smaller yellow suns will live on in a cluster and orbit the galaxy together.

NGC1893:  NGC 1893 is an open cluster in the constellation Auriga. It is about 12,400 light years away. The star cluster is embedded in the HII region IC 410.  Images of the star cluster by the Chandra X-ray Observatory suggest that it contains approximately 4,600 young stellar objects.

IC410

IC 410 is a region of faint nebulosity surrounding the open star cluster NGC 1893. It lies in the constellation Auriga, 1.5° E of the brighter and better known Flaming Star Nebula (IC 405).In appearance, IC 410 resembles the Rosette Nebula in Monocerus. Medium-sized instruments show 40 faint stars elongated N-S lying within a triangle of 9th magnitude stars. The cluster is set in a very rich star field and is also embedded in the nebulosity of IC 410. Without a filter, the nebulosity is very difficult to observe.IC 410 lies about 12,000 light-years away, and is over 100 light-years across. It has been sculpted by stellar winds and radiation from the embedded open star cluster NGC 1893. Formed in the interstellar cloud a mere 4 million years ago, the radiation from these hot stars pushes the gas away from them and creates dark "tadpoles" trailing away from the nebula's central regions. These streamers of denser gas resist the erosive radiation from the hot stars. The tails have grown to 10 light years in length, and are potentially sites of ongoing star formation.

NGC1907

NGC 1907 is irregularly round with 30 stars of a wide range of magnitudes. Two 9.5 magnitude stars to the south do not seem to be part of the group because a small starless gap separates them from the main body.

NGC1912

Messier 38 (NGC 1912) is one of the three Messier open clusters in the southern part of Auriga. It has been nicknamed the "Starfish" cluster, though the origin of this moniker is uncertain.M 38 cluster was discovered by Giovanni Batista Hodierna before 1654, and independently found by Le Gentil in 1749. Charles Messier included it in his catalog in 1764.Lying only 2.5° northwest of M 36, M 38 is about the same size as M 37, but it is somewhat fainter at magnitude 7.4. Messier 38 is a rich, irregularly round group, 20' in diameter, containing over a hundred stars, many of 9th magnitude or brighter. The cluster's brightest stars form an asterism shaped like the Greek letter π. M 38 stands out well from the evenly-distributed background star field. Visually it is the second most impressive of Auriga's "big three" Messier open clusters (M 36, M 37, and M 38).M 38 lies at a distance of 4200 light-years, and has a diameter of 25 light years, about the same as M 37. It is is of intermediate age, about 220 million years old; its hottest member a class B5 star having an absolute magnitude of about -1.5. The cluster also contains a number of A-type main sequence stars, and several G-type giants. The brightest cluster member is a yellow GO giant with a visual magnitude of 7.9 and an actual luminosity of about 900 suns. By comparison, if we could view our Sun from the distance of M 38, it would appear as a 15th magnitude object!

@information from SkySafari

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Comments

Revisions

  • Going for IC417, Joe Matthews
    Original
  • Going for IC417, Joe Matthews
    B
  • Going for IC417, Joe Matthews
    C
  • Final
    Going for IC417, Joe Matthews
    E

B

Title: Additional Data (UV/IR Cut) 20240118

Description: I had some clear sky last night and I most likely should have used the L-Pro filter vs the UV/IR Cut filter to try and bring out the reflection Nebula. I think I succeeded to a degree for I like this version much more than the original.

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C

Title: A Rotated and Cropped View

Description: My 1st Cropped view of most of the field

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E

Title: IC417 and NGC1931

Description: my final image I think the detail is fairly good when zooming in on IC417 and NGC1931. I tried a closer crop but I could get the image to plate solve.

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Going for IC417, Joe Matthews