Kohoutek 1-16 (K1-16) Planetary Nebula HOO (Omar Radwan)

Kohoutek 1-16 (K1-16) Planetary Nebula HOO

Attached are two images of Kohoutek 1-16. This is a small PN located in the constellation Draco with a diameter of roughly 1.6 arcminutes. Just beneath and slightly to the left of K1-16s is the quasar KUV 18217+6419. Its distance from us spans approximately 3.4 billion light years.

Observations of the central star within the planetary nebula Kohoutek 1-16 reveal it to exhibit low-amplitude pulsations when subjected to high-speed photometry. The primary pulsation period is approximately 28.3 minutes, with a semi-amplitude typically around 0.01 magnitudes. Despite this regularity, additional periodicities occasionally manifest in power spectra derived from light curves, and on certain occasions, abrupt transitions into or out of a state devoid of discernible variations have been documented. This phenomenon, termed 'mode switching', is reminiscent of behavior observed in some nonradial pulsators of the ZZ Ceti type. However, given its effective temperature surpassing 80,000 K, K1-16 is deemed too hot to fit the ZZ Ceti classification. Spectral and photometric analyses indicate a strong resemblance between the central star of K1-16 and the previously identified hot pulsator PG 1159-035. These parallels suggest a novel mechanism of pulsational instability applicable to extremely hot degenerate or predegenerate stars. It is anticipated that as K1-16 undergoes evolutionary contraction, its pulsation period will decrease at a rapid rate, potentially detectable within a span of approximately 2 years.

Grauer, A. D., and H. E. Bond. "The pulsating central star of the planetary nebula Kohoutek 1-16." Astrophysical Journal/The Astrophysical Journal, vol.

Original
B
Final
C
D

B

Title: Kohoutek 1-16 (K1-16) Planetary Nebula Cropped and Enlarged

Uploaded: ...

C

Description: Revised image with Darkened background

Uploaded: ...

D

Description: Cropped revised image with Darkened background

Uploaded: ...

N.I.N.A. Users

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

	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

	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

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	9909320
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

Image Index:

Contribution Index (beta):

Kohoutek 1-16 (K1-16) Planetary Nebula HOO

Kohoutek 1-16 (K1-16) Planetary Nebula HOO

Equipment

Acquisition details

Description

Comments

Revisions

B

C

D

Sky plot

Histogram

In these public groups

		...
You have no new notifications.

Image Index:

Contribution Index (beta):

Kohoutek 1-16 (K1-16) Planetary Nebula HOO

Kohoutek 1-16 (K1-16) Planetary Nebula HOO

Equipment

Acquisition details

Description

Comments

Revisions

B

C

D

Sky plot

Histogram

In these public groups

Notifications

AstroBin is in READ ONLY mode

Sorry :-(

Sorry :-(

Sorry :-(

Are you really sure?

Warning!

Warning!

Are you sure?

Report abuse

Slideshow settings

IOTD/TP stats (last [x] days)

Distribution of astrophotographers

Distribution of subject types

Distribution of data sources

Sorry

Sorry

Share

Upload new revision

Upload uncompressed source (XISF/FITS/PSD/TIFF)

Delete image and all its revisions?

Delete original image?

Delete all other versions?

Delete all revisions?

Delete this revision?

Delete this revision?

Delete this revision?

IOTD/TP stats

The following people like this image

The following people bookmarked this image

Warning

Flag malfunctioning thumbnails

Contains

Remove yourself as a collaborator

Plate-solving information