M99 (Giovanni) - AstroBin

Celestial hemisphere: Northern · Constellation: Coma Berenices (Com) · Contains: Coma Pinwheel · M 99 · NGC 4254 · Virgo Cluster Pinwheel

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M99

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M99

M99

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Messier 99 (auch als NGC 4254 bezeichnet) ist eine +9,7 mag helle Spiralgalaxie mit einer Flächenausdehnung von 5,3' × 4,6' im Sternbild Haar der Berenike.

M99 wurde am 15. März 1781 zusammen mit den benachbarten Spiralgalaxien M98 und M100 von Pierre Méchain entdeckt. Sie war nach der Whirlpool-Galaxie M51 die zweite Galaxie, deren Spiralstruktur entdeckt wurde, und zwar von Lord Rosse im Jahr 1846.

M99 ist eine Galaxie vom Hubble-Typ Sc, die wir beinahe frontal sehen. Eigentümlich an der Gestalt der Galaxie ist jedoch ihr verrutschter Kern, der im Bild deutlich nördlich des Zentrums der Spirale liegt. Die Galaxie liegt am nördlichen Rand des Virgo-Galaxienhaufens in der Nähe der Spiralgalaxie M98. Es gibt Mutmaßungen, dass der verrutschte Kern und die Nähe dieser beiden Galaxien kein Zufall sind, sondern auf einen Vorbeiflug aneinander in der Vergangenheit hindeuten (Wikipedia).

Ritchey Chretien telescopes GSO Family
Imagers of Italy

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	Distinct awarded users	Total awarded images
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	Image of the day	Top pick	Top pick nominations	Total submitted
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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.

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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.

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