M31-V1 (V0619) - Hubble’s Andromeda Cepheid - LRGB (dswtan)

Celestial hemisphere: Northern · Constellation: Andromeda (And)

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M31-V1 (V0619) - Hubble’s Andromeda Cepheid - LRGB

Revision title: M31-V1 (V0619) - Hubble’s Andromeda Cepheid - LRGB

Powered byPixInsight

M31-V1 (V0619) - Hubble’s Andromeda Cepheid - LRGB

Revision title: M31-V1 (V0619) - Hubble’s Andromeda Cepheid - LRGB

M31-V1 was the first Cepheid discovered by Edwin Hubble in the Andromeda nebula. As a "standard candle", it settled that Andromeda was actually an "island universe" outside of our own Milky Way, and not just a weird "local" spiral gas cloud.

The CloudyNights Goofi's Imaging Challenge for September 2022 was M31 (Andromeda Galaxy). Since my new widefield rig is still waiting for a focus motor and not set up, and I took a decent M31 mosaic last year (https://www.astrobin.com/4vyc4u/), I decided to go the other direction and go deep. I used my narrowfield rig, currently a reduced EdgeHD 8", recently re-collimated.

Capture was multiple sessions between 21-24 Sep 2022. 10.5hrs total integration.

120x 60sec RGB
270x 60sec L2

Unity gain, 0C

3 versions - Wide (full frame on the 294MM), crop without indicator, crop with circle around V1.

https://simbad.u-strasbg.fr/simbad/sim-id?Ident=M31+V0619

https://www.aavso.org/cepheid-variable-m31v1-hubbles-first-cepheid
https://astronomy.com/magazine/news/2022/08/the-star-that-changed-the-cosmos-m31-v1
https://www.jstor.org/stable/10.1086/663651

https://en.wikipedia.org/wiki/Great_Debate_(astronomy)
https://en.wikipedia.org/wiki/Cepheid_variable

https://www.cloudynights.com/topic/839675-goofis-imaging-challenge-september-2022-m31-andromeda-galaxy/

Original
B
Final
C

B

Title: M31-V1 (V0619) - Hubble’s Andromeda Cepheid - LRGB

Description: Crop centered on V1

Uploaded: ...

C

Title: M31-V1 (V0619) - Hubble’s Andromeda Cepheid - LRGB

Description: V1 circled

Uploaded: ...

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Status	Advanced success
Started	...
PixInsight job	EFOIFQZM8F7T7835NKWTAFWHZIMETEMZ
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	00h41m27s.209
RA (top/left)	00h42m04s.610
RA (top/right)	00h40m44s.842
RA (bottom/right)	00h40m50s.508
RA (bottom/left)	00h42m09s.394

Dec (center)	+41°09′58″.14
Dec (top/left)	+41°17′55″.20
Dec (top/right)	+41°16′52″.86
Dec (bottom/right)	+41°01′59″.99
Dec (bottom/left)	+41°03′02″.28

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M31-V1 (V0619) - Hubble’s Andromeda Cepheid - LRGB

Revision title: M31-V1 (V0619) - Hubble’s Andromeda Cepheid - LRGB

M31-V1 (V0619) - Hubble’s Andromeda Cepheid - LRGB

Revision title: M31-V1 (V0619) - Hubble’s Andromeda Cepheid - LRGB

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M31-V1 (V0619) - Hubble’s Andromeda Cepheid - LRGB

Revision title: M31-V1 (V0619) - Hubble’s Andromeda Cepheid - LRGB

M31-V1 (V0619) - Hubble’s Andromeda Cepheid - LRGB

Revision title: M31-V1 (V0619) - Hubble’s Andromeda Cepheid - LRGB

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