M101 Pinwheel Galaxy & Friends (Mark Germani)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: HD122471 · HD122865 · M 101 · NGC 5422 · NGC 5447 · NGC 5449 · NGC 5450 · NGC 5451 · NGC 5453 · NGC 5455 · NGC 5457 · NGC 5461 · NGC 5462 · NGC 5471 · NGC 5473 · NGC 5474 · NGC 5477 · NGC 5484 · NGC 5485 · NGC 5486 · Pinwheel galaxy

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M101 Pinwheel Galaxy & Friends

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M101 Pinwheel Galaxy & Friends

Second attempt at this target with the same OTA, this time with a proper flattener. Roughly the same amount of time on the target, though.

After doing a number of tests on ISO 400 vs ISO 800, I discovered that the SNR was better with the same integration time at ISO 400 than it was at ISO 800, the latter being the recommended ISO for the 600D/T3i. Unfortunately at 90s unguided, 1/3 of the exposures had to be trashed - almost exactly that ratio for each night (what this means about the Skyguider Pro is something I'll have to explore at some point).

Overall, I'm happier with this effort than I was with the first one, and I suspect half of that is due to an improvement in my processing. I might try and add some time to this later, when possible.

Original
Final
E

E

Description: Decided this could benefit from combining the third and fourth revisions, and finishing with ACR (thanks @wsg!) Still pretty dodgy, but better.

Uploaded: ...

iOptron Skyguider Pro
Canadian Astrophotography
Pacific Northwest Astrophotographers
Unmodified DSLR Deep Sky
Musical Imagers
DSLR/Mirrorless Imagers from the World
DSLR and mirrorless astrophotography
Light Polluted skies
The refractors!
Broadband under Bortle 7/8/9

Past Projects

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Status	Advanced success
Started	...
Astrometry.net job	5110124
PixInsight job	862CV5T5SYS8L1IF204TM7HZJFZCT5GP
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	14h03m11s.31
RA (top/left)	13h59m31s.55
RA (top/right)	13h58m48s.73
RA (bottom/right)	14h06m41s.86
RA (bottom/left)	14h07m45s.21

Dec (center)	+54°20′54″.8
Dec (top/left)	+55°16′05″.4
Dec (top/right)	+53°30′26″.8
Dec (bottom/right)	+53°25′24″.5
Dec (bottom/left)	+55°10′48″.2

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M101 Pinwheel Galaxy & Friends

M101 Pinwheel Galaxy & Friends

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M101 Pinwheel Galaxy & Friends

M101 Pinwheel Galaxy & Friends

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