NGC7139 Planetary Nebula (niteman1946)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: NGC 7139

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NGC7139 Planetary Nebula

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NGC7139 Planetary Nebula

NGC7139 is a tiny planetary nebula in the pentagon of Cepheus. This kind of objects represents a luminous shell of gas ejected by a late type star in its Red Giant stage of evolution. When the star was unstable in its post-main sequence phase, an increase in energy generation caused the star to expand beyond its state of balance; it overshot and then contracted again. The contraction heated the interior, increased the rate of energy generation and initiated a new expansion. These "thermal pulses" eventually eject an expanding shell of unconsumed hydrogen, and when this hydrogen is stimulated the emission that gives rise to this phenomenon starts. Estimated distance is 4300 light years. [Astronomy Picture of the Month, 2004]

Processing was done with PixInsight, following (for the most part) kayronjm's tutorial of Feb. 24th. Only Ha was used to develop the Luminance image. Ha, OIII and SII narrow band filters were collected for the color mix.

The image was captured with the venerable Meade 12"LX200, using the Atik 383L+ mono at F7.16 (i.e. 2182mm FL). All subs (except Ha) were taken at 1x1 bin, -10C, and 10 minutes each. Ha was taken at both 10 minutes and 30 minutes.

Image --

Ha - 600s : 16 subs (2.67 hr) on Sep 6th and 7th.

Ha - 1800s: 11 subs (5.50 hr) on Sep 12th and 13th.

OIII- 600s : 23 subs (3.83 hr) on Sep 6th and 7th.

SII - 600s : 19 subs (5.17 hr) on Sep 6th and 7th.

Color mix for the image was done with only the narrow band filters:

Red = 75%Ha+25%SII, Green = 15%Ha+85%OIII, Blue = OIII

North is up, and this is a medium crop due to the target's small size.

Original
Final
B

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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
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
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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
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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	Basic success
Started	...
Astrometry.net job	775547
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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NGC7139 Planetary Nebula

NGC7139 Planetary Nebula

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Image Index:

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NGC7139 Planetary Nebula

NGC7139 Planetary Nebula

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