M31-V1, the star Edwin Hubble used to prove M31 was OUTSIDE the Milky Way (Bruce Larsen)

M31-V1, the star Edwin Hubble used to prove M31 was OUTSIDE the Milky Way

From my 556 MB 2x drizzled Andromeda data, I identified the location of M31-V1, the famous Cepheid variable star Edwin Hubble used in 1923 to calculate the distance to the Andromeda galaxy, proving it lies far outside the reaches of the Milky Way. It's barely visible in my image, but it's in there. This image was taken near its minimum brightness. @darkdesertdome has an image of the same area taken 34.6 periods earlier, from October 2020, when near its maximum. In the next few days we'll post the comparison.

This is the star that first proved the unimaginable vastness of the universe. Check out the following links I used to identify the location:
https://hubblesite.org/contents/media/images/2011/15/2851-Image.html

https://astrovirusblog.wordpress.com/2020/10/13/m31-andromeda-galaxy-and-cepheid-variable-1/

https://www.cloudynights.com/uploads/monthly_12_2019/post-212468-0-67489000-1576883501.jpg

Original
Final
C

Please note: The following tables are updated every 24 hours.

Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Basic pending
Started	...
Astrometry.net job	8660449
PixInsight job	n/a
PixInsight queue size	n/a
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