Sh2-216 - Sh2-221 (Jeffrey K Lovelace)

Celestial hemisphere: Northern · Constellation: Auriga (Aur) · Contains: B25 · PK158+00.1 · Sh2-216 · Sh2-217 · Sh2-219 · Sh2-221

Image of the day 09/11/2020

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Sh2-216 - Sh2-221

Link: https://asterisk.apod.com/viewtopic.php?f=29&t=40959#p305820

Image of the day 09/11/2020

Powered byPixInsight

Sh2-216 - Sh2-221

Link: https://asterisk.apod.com/viewtopic.php?f=29&t=40959#p305820

Light frames were acquired between August 30th and October 30th 2019.

Narrowband color: HSO

Stars: RGB

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Stars’ Lifecycles Play Out in One Patch of Sky

Sh2-221 and Sh2-216 resulted from different types of star deaths. Sh2-221, at an approximate age of 6,000 years old, is a supernova remnant (SNR). The planetary nebula (PN) Sh2-216, aged at nearly 500,000 years old, has grown exceedingly dim, and its fuzzy edges indicate that it is beginning to dissipate. SNR Sh2-221 is roughly 2,600 ly away and about 130 ly across, while PN Sh2-216 is approximately 400 ly away and 11 ly wide. Therefore, PN Sh2-216 is much closer and smaller in actual size than SNR Sh2-221.

Sh2-217, Sh2-219, and BFS 44; the three smaller emission nebulae, are all part of the same star forming region.

Narrowband imaging
Takahashi Refractors
Sharpless2 Objects
Planetary Nebulae
The refractors!

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	Advanced success
Started	...
Astrometry.net job	3819054
PixInsight job	YI3CSKO3I1W0T9SL0PJKZFT922PJKVKB
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	04h51m41s.7
RA (top/left)	05h08m05s.6
RA (top/right)	04h35m16s.3
RA (bottom/right)	04h36m21s.5
RA (bottom/left)	05h07m03s.4

Dec (center)	+46°50′08″
Dec (top/left)	+48°34′24″
Dec (top/right)	+48°33′51″
Dec (bottom/right)	+44°57′54″
Dec (bottom/left)	+44°58′19″

Image Index:

Contribution Index (beta):

Image of the day 09/11/2020

Sh2-216 - Sh2-221

Image of the day 09/11/2020

Sh2-216 - Sh2-221

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Image Index:

Contribution Index (beta):

Image of the day 09/11/2020

Sh2-216 - Sh2-221

Image of the day 09/11/2020

Sh2-216 - Sh2-221

Equipment

Acquisition details

Description

Comments

Acquired at

Sky plot

Histogram

In these public groups

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