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Contains:  Bode's Galaxy, M 81, NGC 3031
Getting plate-solving status, please wait...

M81

Technical card


Dates:March 16, 2020

Frames: 255x180"

Integration: 12.8 hours

Avg. Moon age: 22.23 days

Avg. Moon phase: 49.12%


Basic astrometry details

Astrometry.net job: 3380329

RA center: 9h 55' 33"

DEC center: +69° 4' 4"

Pixel scale: 1.176 arcsec/pixel

Orientation: 1.549 degrees

Field radius: 0.285 degrees


Resolution: 1391x1051

Locations: my little astrofarm, Weppersdorf, Austria

Data source: Backyard

Description

M81, also called Bode's galaxy, is one of the biggest and brightest galaxies in the sky.
At 12 Million lightyears distance, many details can be resolved if scope and seeing permits.
Here the seeing was good, and the scope was first time guided by the new Lacerta Mgen3 guider using multistar guiding. That additionally helps keeping stars compact by virtually eliminating seeing effects on the guidescope. I was really amazed to see the raw pics come in that sharp.

At left there is the small satellite galaxy Holmberg IX resolved into stars, and a HII region there is also visible.

Throughout the field there is a lot galactic cirrus nebula or IFN visible, belonging to our Milkyway galaxy.

Presented are a crop on M81 and Holmberg IX, a full field and an annotated version.
And a center crop of a single Lumi raw to show how that was like.
PI subframe selector analysis FWHM 2.29 pixelpitch = 0.78

LRGB using 10" f/4 Lacerta Photonewton and ASI1600mono with Astronomik filters.

The color here at Astrobin has a deeper orange hue than on my calibrated monitor. No idea why, have to ask Salvatore. A more original (yellower) color rendition can be found here on Flickr:
https://www.flickr.com/photos/109613429@N08/49721368298

Interestingly, on my Android colors are fine!
EDIT: Its a confirmed Firefox problem, because Astrobin currently strips the embedded ICC profile from the uploaded image. You need to set color mode = 1 in FF. Other browsers do better by default.

Comments

Author

tommy_nawratil
tommy_nawratil
License: None (All rights reserved)
183219
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Revisions

B

Description: full field

C

Description: annotated image

D

Description: Lumi raw pic 100%, with psf, FWHM 2.29

E

Description: M81 new upload with correct colors... not yet...

Sky plot

Sky plot

Histogram

M81, 



    
        

            tommy_nawratil