PK 136+05 (HA/OIII/RGB) (Michel Makhlouta)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: PGC 2797165 · PK136+05.1

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PK 136+05 (HA/OIII/RGB)

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PK 136+05 (HA/OIII/RGB)

HFG1 (also known as PK 136+05) is a faint, very old planetary nebula of a light-year or more across, located in the northern constellation of Cassiopeia (the Seated Queen). It was discovered in 1982 by Heckathorn, Fesen and Gull, hence its name. Planetary nebulae represent the final brief stage in the life of a medium-sized star like our Sun. While consuming the last of the fuel in its core, the dying star (collapsing from a red giant to a white dwarf) expels a large portion of its outer envelope.

HFG1 was produced by the 14.5 magnitude central star V664 Cas. This is not a single star but a close binary star system of a white dwarf and a Sun-like star, which are only a few million kilometers apart and are orbiting each other every 14 hours. (Source: annesastronomynews.com)

I thought I've collected enough photons for this target, and I couldn't have been more wrong. Despite all the hours in, this was a challenge to process. What a faint but beautiful target. I dismantled my balcony setup in preparation from winter, and took the opportunity to let my RC (and my not so collimated eyes) rest and dusted off the esprit 120. May the gods of weather be kind this season.

Clear skies and stay safe.

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	6517702
PixInsight job	71VRFXW5AJ1NDCNJAEMRHXOY5SDOSNY9
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	03h03m46s.903
RA (top/left)	03h03m14s.566
RA (top/right)	03h07m11s.554
RA (bottom/right)	03h04m20s.187
RA (bottom/left)	03h00m23s.268

Dec (center)	+64°55′17″.21
Dec (top/left)	+64°33′25″.80
Dec (top/right)	+64°59′46″.56
Dec (bottom/right)	+65°17′08″.54
Dec (bottom/left)	+64°50′30″.76

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PK 136+05 (HA/OIII/RGB)

PK 136+05 (HA/OIII/RGB)

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PK 136+05 (HA/OIII/RGB)

PK 136+05 (HA/OIII/RGB)

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