M31 - map of the centre (Lars Stephan)

Celestial hemisphere: Northern · Constellation: Andromeda (And) · Contains: Andromeda galaxy · Great Nebula in Andromeda · M 31 · NGC 224

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M31 - map of the centre

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M31 - map of the centre

Im Jahr 1981 erschien der "Atlas of the Andromeda Galaxy" vom Kitt Peak - Observatorium, in dem die Kugelsternhaufen unserer Nachbargalaxie mit "G" für globular cluster bezeichnet sind. Einige der "G"-Objekte wurden später als Sterne, Galaxien oder HII-Regionen identifiziert.

Historisch besonders interessant ist der Veränderliche V1, der von Edwin Hubble auf seiner Aufnahme am 2,5 m - Hooker - Spiegel vom 5. Oktober 1923 als Delta Cepheid erkannt wurde. Er bestimmte die Periode zu 31 Tagen und die Entfernung nach der Perioden-Leuchtkraft-Beziehung zu 980.000 Lichtjahren. Walter Baade hat ja später die fehlerhafte Eichung der dabei verwendeten Perioden-Leuchtkraftbeziehung erkannt und die Entfernung "verdoppelt". Aber immerhin war die extragalatische Natur von M31 durch Hubble schon erwiesen.

In 1981 the "Atlas of the Andromeda Galaxy" was published by Kitt Peak - Observatorium, in which the globular clusters of our neighbouring galaxy are marked with "G". Some of the "G"-objects were later identified as stars, galaxies or HII regions.

Of particular historical interest is the variable V1, which was recognised by Edwin Hubble as Delta Cepheid on his photograph of the 2. 5 m Hooker - telescop on 5 October 1923. He determined the period to 31 days and the distance according to the period-luminosity relationship to 980,000 light years. Walter Baade later recognized the incorrect calibration of the period-luminosity relationship used and "doubled" the distance. But at least the extra-galatic nature of M31 was already proven by Hubble.

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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
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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.
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	Advanced success
Started	...
Astrometry.net job	2703111
PixInsight job	GVKFHDMVIG4832Y1PFZ5PXXDT3OVI0YB
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	00h42m12s.24
RA (top/left)	00h44m18s.14
RA (top/right)	00h40m03s.74
RA (bottom/right)	00h40m07s.57
RA (bottom/left)	00h44m19s.36

Dec (center)	+41°12′13″.7
Dec (top/left)	+41°32′26″.8
Dec (top/right)	+41°31′54″.2
Dec (bottom/right)	+40°51′51″.2
Dec (bottom/left)	+40°52′25″.8

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M31 - map of the centre

M31 - map of the centre

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M31 - map of the centre

M31 - map of the centre

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