M91 ( sydney ) - AstroBin

Celestial hemisphere: Northern · Constellation: Coma Berenices (Com) · Contains: M 91 · NGC 4548

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M91

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M91

Imaging Telescopes Or Lenses: Celestron c14 EdgeHD Celestron C14
Imaging Cameras: SBIG ST-10XME
Mounts: Astro-Physics 900 GTO
Filters: Luminance · Astrodon I-series
Accessories: Celestron Reducer 0.7x

Dates:: April 12, 2020 · May 14, 2020
Frames:: Astrodon I-series: 60×480″(8h) bin 2×2
Luminance: 46×600″(7h 40′) bin 1×1
Integration:: 15h 40′
Avg. Moon age:: 20.88 days
Avg. Moon phase:: 62.94%

Basic astrometry details

Astrometry.net job: 3615882

RA center: 12h35m25s.7

DEC center: +14°29′52″

Pixel scale: 0.511 arcsec/pixel

Orientation: 127.734 degrees

Field radius: 0.186 degrees

Resolution: 2178x1464

File size: 1.0 MB

Data source: Backyard

M91 (NGC 4548) is a barred spiral galaxy in the constellation Coma Berenices. It is one of the faintest Messier objects at approximately magnitude 11. M91 is about 63 million light-years away and has an apparent size of 5.4 x 4.3 arc minutes. The observation of Cepheid variable stars by the Hubble Space Telescope confirmed that M91 is a member of the Virgo Cluster [https://iopscience.iop.org/article/10.1086/307151/fulltext/39340.text.html]. M91 is classified as “anemic” for its relative lack of star forming regions and gas, possibly resulting from ram pressure stripping as it passes through the dense galaxy cluster [http://adsabs.harvard.edu/full/1999A%26A...349..411V].

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	Distinct awarded users	Total awarded images
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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
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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
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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.
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Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Dismissals 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 success
Started	...
Astrometry.net job	3615882
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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