EAA - Second Attempt (astropical)

Celestial hemisphere: Southern · Constellation: Orion (Ori) · Contains: 41 Ori A) · 41 Ori C · 41 Ori D · 41 the01 Ori · 42 Ori) · 42 c Ori · 43 Ori) · 43 the02 Ori · 44 Ori) · 44 iot Ori · 45 Ori · Great Orion Nebula · HD294262 · HD294263 · HD36742 · HD36782 · HD36866 · HD36884 · HD36899 · HD36917 · HD36918 · HD36919 · HD36937 · HD36938 · HD36939 · HD36958 · HD36959 · HD36960 · HD36981 · HD36982 · And 46 more.

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EAA - Second Attempt

Revision title: Composite of long and short exposures

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

Powered byPixInsight

EAA - Second Attempt

Revision title: Composite of long and short exposures

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

The second attempt in EAA. Still much to learn with the try and error method. Surrender only when the number of errors exceeds the number of tries.

Since the Orion nebula is a bright object it can be marveled by attendees of a star party or other outreaches already after having collected the first frame. Further stacking will reduce noise and increase contrast. Actually the image was pretty clean after 8 frames, i.e. after only 4.8 minutes.

The field of view of the setup was just right to fit the Orion and Running Man nebulae. The camera gain was set to 185 which is the "sweet spot" of the Uranus-C (IMX585) that keeps readout noise low at maximum possible dynamic range.

The ambient air temperature was 14.5°C, the sensor temperature merely 18.8°C attesting that the camera's passive cooling is effective (at least in winter).

It is important to pause stacking when clouds are crossing as the image will be contaminated with walking noise, most likely ruined.

The final image is a histogram-stretched FITS file without further processing. The artifact to the left of the "Running Man" is from the interference-type LPR filter. It can be corrected by rotating the filter, but I figured it after stacking was complete.

Since the core of M42 is saturated I took a few frames with 15 seconds (Rev B) but haven't figured yet how to blend the two layers in Photoshop CS2.

Original
B
Final
C

B

Title: Short Exposure

Uploaded: ...

C

Title: Composite of long and short exposures

Description: Thanks to Dominique's link. Lady, you are an angel!

Uploaded: ...

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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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Status	Advanced success
Started	...
Astrometry.net job	7014720
PixInsight job	IHHBM3EGJ5O2HMWEWF1TU5OU59M9B34B
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	05h35m15s.39
RA (top/left)	05h35m07s.91
RA (top/right)	05h32m30s.16
RA (bottom/right)	05h35m22s.99
RA (bottom/left)	05h38m00s.93

Dec (center)	-05°16′21″.7
Dec (top/left)	-04°27′12″.8
Dec (top/right)	-05°43′14″.8
Dec (bottom/right)	-06°05′27″.9
Dec (bottom/left)	-04°49′23″.10

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EAA - Second Attempt

Revision title: Composite of long and short exposures

EAA - Second Attempt

Revision title: Composite of long and short exposures

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EAA - Second Attempt

Revision title: Composite of long and short exposures

EAA - Second Attempt

Revision title: Composite of long and short exposures

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C

Sky plot

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