Searching for diffuse structures in the vicinity of Alpha Gru (Alnair) in Ha (Alexandr Zaytsev)

Celestial hemisphere: Southern · Constellation: Grus (Gru) · Contains: Al Na'ir (α Gru) · Alnair · HD209952 · NGC 7213 · PGC 130725 · PGC 130726 · PGC 163660 · PGC 163762 · PGC 163773 · PGC 503947 · PGC 504485 · PGC 506096 · PGC 506380 · PGC 506644 · PGC 507371 · PGC 507571 · PGC 508354 · PGC 509510 · PGC 509802 · PGC 511134 · PGC 511490 · PGC 68055 · The star Alnair · alf Gru

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Searching for diffuse structures in the vicinity of Alpha Gru (Alnair) in Ha

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Searching for diffuse structures in the vicinity of Alpha Gru (Alnair) in Ha

39min of integral Ha exposure of immediate surroundings of Alpha Gruis (Alnair) aimed at searching for diffuse structures that might be hiding in the halo - captured remotely using Telescope #3 (ASA-N D = 0.5m f/3.8, FLI ProLine 16803) system of ChileScope over two imaging sessions carried out on on Sep 21, 2023 (pointing directly at Alpha Gru) and Oct 21, 2024 (moving the optical axis off Alpha Gru by 15 arc.min to reduce the aperture effects).

One NGC catalog galaxy and multiple PGC catalog galaxies are detectible in the frame, some of which remain visible on the starless image (revisions B and C), but no extended diffuse structures are detected here, at least at this level of integral exposure and aperture effects suppression.

Note that some of the PGC galaxies visible in the original image are indistinguishable from stars, so they are also getting suppressed in the starless images (revisions B and C).

This is continuation of work started under [1-5]:

[1] https://www.astrobin.com/ojtcmx/C/

[2] https://www.astrobin.com/8gpw0u/D/

[3] https://www.astrobin.com/84nak0/B/

[4] https://www.astrobin.com/i72dq4/

[5] https://www.astrobin.com/qvl11f/B/

Final
Original
B
C

B

Title: Manually annotated starless version of the image

Uploaded: ...

C

Title: Starless version of the image

Uploaded: ...

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Status	Advanced success
Started	...
PixInsight job	XM95Y7SG1863D7AG0I3PK3OSIVWCW0GR
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	22h08m14s.646
RA (top/left)	22h10m53s.910
RA (top/right)	22h10m52s.896
RA (bottom/right)	22h05m37s.745
RA (bottom/left)	22h05m33s.737

Dec (center)	-46°58′26″.60
Dec (top/left)	-47°17′36″.70
Dec (top/right)	-46°39′34″.98
Dec (bottom/right)	-46°39′14″.77
Dec (bottom/left)	-47°17′15″.50

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Searching for diffuse structures in the vicinity of Alpha Gru (Alnair) in Ha

Searching for diffuse structures in the vicinity of Alpha Gru (Alnair) in Ha

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Searching for diffuse structures in the vicinity of Alpha Gru (Alnair) in Ha

Searching for diffuse structures in the vicinity of Alpha Gru (Alnair) in Ha

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