IC417 - aka The
Spider & The Fly - SHO + RGB
Below
is the composite image of IC417 where I've added H-Alpha and SII at
100% to the Red channel, OIII at 50% to the green channel and Ha and
OIII
at 20% and 50% respectively to the blue channel.
Below is the pure RGB:
Above is the pure RGB image. Below is the pure narrowband image done in
the SHO (Sulfer - Hydrogen - Oxygen) palette but with the RGB stars
layered in to recover their colour.
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From my friend Don Waid's webpage for this target (
http://www.waid-observatory.com/ic417-2020-01-19-HOO.html ):
IC417 &
NGC 1931, commonly known as the Spider and Fly
Nebula. They are located approximately 10,000 and 7,000
light-years respectively from the Earth in the
constellation Auriga. These two nebulae are composed
of massive clouds of gas and dust and is the site of new stellar
birth. The gas in the nebula is excited by a clusters of
massive, relatively newly formed, stars located near their
centers. The large nebula on the left side of the image is
the Spider and the small nebula is the Fly. The two bright
stars in the Spider are foreground objects and not part of the
nebula. The brightest star is designated Phi Aurigae and
is only about 450 light years from the Earth.
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Scope: AP155EDF w Focus Boss II
Camera: Moravian G4 (16803 ccd) w Astrondon Gen II HaLRGB
filters
Mount: Paramount MX
Guided w ST-402 and Borg 60mm guidescope
Acquired using TheSkyX
9/9/9 x 10 min RGB
3/10/15 x 20 min SII / H-Alpha / OIII
All calibration done in PixInsight
RGB and pure SHO processed separately in PixInsight;
Stars removed from the SHO image using StarXTerminator
Stars temporarily removed from RGB then added back.
SHO (starless)+RGB Stars combine in PixInsight
Lucknow, Ontario
February 2023
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