Melotte 15 (Cristiano Secci)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: IC 1805

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Melotte 15

Link: https://www.flickr.com/photos/cristianosecci/45228942874

Powered byPixInsight

Melotte 15

Link: https://www.flickr.com/photos/cristianosecci/45228942874

Melotte 15 is an open cluster of bright stars located at the center of the Heart Nebula (IC 1805). Named for its discoverer, Philibert Jacques Melotte (1880-1961), the grouping of O-type supergiants is only about 1.5 million years old. "O" stars are the brightest and most massive known, about 20 to 100 times larger than the Sun! The lifespan of these hot, blue stars can be as short as 3-6 million years. Melotte 15 is about 7,500 light years away from Earth.

Technical Data:

OTA: SkyWatcher Newton 200mm F/5

Mount: iOptron CEM60

Camera: ZWO ASI 1600 MM-C, cooled at -20C

Guide Camera: QHY-5LII Mono

Guide Scope: ArteSky 60mm F/4

Filters: Optolong Ha, OIII, SII

Baader Coma Corrector MPCIII

Software: Sequence Generator Pro, PHD2, Deep Sky Stacker, PS

56 frames in total, Gain 300 - Offset 21

Ha 20x120s + 4x300s (60m)

OIII 16x120s (32m)

SII 16x120s (32m)

Total Integration Time: 2 hour, 4 minutes

15 Bias

11 Darks

No Flats

Narrowband imaging
Imagers of Italy
ZWO ASI1600MM/QHY163M

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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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	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.

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 success
Started	...
Astrometry.net job	2386078
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Melotte 15

Melotte 15

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