Horsehead and Flame Nebulae (Joachim Ong)

Horsehead and Flame Nebulae

Horsehead and Flame Nebula (IC 434 & NGC 2024)

The famous horsehead can be seen near the centre of the image. Stars Alnitak and Alnilam of Orions belt are the two brightest stars in the image.

Messed up this image as I carelessly forgot to remove my focusing aid (diffraction mask) so severely reduced the quality of about an hours worth of data. Hence the diffraction spikes can still be seen in the image.

IMAGE DATA

Location: Koh Samet, Thailand

Camera: Modified Canon 450D

Telescope: William Optic ZenithSatr 70ED

Mount: Celestron CG-5GT

Unguided

Total exposure: Not impt since focus mask severely reduced data collected.

Subs: 51*120s (@ ISO800)

Focal length: 344mm @ f/4.9 (WO x0.8 reducer)

Filters: Celestron UHC/LPR

Notes: Poor transparency due to haze, half of subs had a focus mask covering scope diameter

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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
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.
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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.

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