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Name / Constellation

IC 417

Other: Sh2-234; Ced 46; LBN 804


Coordinates AR: 05h 28m 06s - Dec: +34° 25′ 00″
Optics Takahashi FSQ 106N APO Fluorite F5 - 60/220 guiding refractor
Camera-Mount SBIG STF8300M - Orion StarShot Guider - 10Micron GM2000 QCI Mount
Filters Baader Halpha 7 nm - Oxygen 3 -Sulfur 2
  • Halpha
  • Oxygen 3
  • Sulfur 2
  • 28 x 900 sec - 7 hours
  • 28 x 900 sec - 7 hours
  • 28 x 900 sec - 7 hours
Location / Date Promiod (Valle D'Aosta-Italy) "TLP" Remote Observatory - 27/28/30 dec 2019
Seeing About 3 - 4"- 2.1 arcosec/pixel unbinned
Note HST Palette - Bad seeing
Acquisition MaxIm DL - CCD Autopilot 5 - CCD Commander
Processing Adobe Photoshop CC -

C 417, sometimes known as Spider Nebula, is a large visible emission nebula in the constellation of Auriga; it is linked to the open Stock 8 cluster and is the site of important star formation processes. IC 417 is located in the central-southern part of the constellation, in a region very rich in star fields and nebulae halfway between the stars ι Aurigae and θ Aurigae; in its immediate vicinity the star φ Aurigae is observed, which with its magnitude 5.08 represents a valid reference. Through an optical instrument it is possible to distinguish the central open cluster, which is formed by a few dozen stars up to magnitude 12 arranged in alignments and concatenations and dominated towards the south by two stars of magnitude 9. The nebulous contour instead remains invisible to the telescopes of diameter more widespread and can be revealed by long exposure photographs. The most suitable period for its observation in the evening sky falls between the months of October and March and is greatly facilitated for observers located in the regions of the terrestrial northern hemisphere; in the northernmost latitudes it occurs circumpolar, while from areas such as the southern tip of South America it can practically never be observed.