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Contains:  NGC 5195, Whirlpool galaxy, M 51, NGC 5194
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The Whirlpool Galaxy (Messier 51), 





    
        

            Luca Marinelli
The Whirlpool Galaxy (Messier 51)

The Whirlpool Galaxy (Messier 51)

Technical card

Resolution: 2369x1896

Dates:Jan. 12, 2019Jan. 15, 2019Jan. 29, 2019Feb. 9, 2019March 23, 2019April 29, 2019

Frames:
Astrodon Tru-Balance Gen2 E-Series - B 36mm: 157x60" (gain: 76.00) -20C bin 1x1
Astrodon Tru-Balance Gen2 E-Series - G 36mm: 172x60" (gain: 76.00) -20C bin 1x1
Astrodon Tru-Balance Gen2 E-Series - L 36mm: 276x30" (gain: 76.00) -20C bin 1x1
Astrodon Tru-Balance Gen2 E-Series - L 36mm: 70x45" (gain: 76.00) -20C bin 1x1
Astrodon Tru-Balance Gen2 E-Series - R 36mm: 125x60" (gain: 76.00) -20C bin 1x1
Astrodon Narrowband 3nm Ha: 38x480" (gain: 139.00) -20C bin 1x1

Integration: 15.8 hours

Darks: ~50

Flats: ~20

Flat darks: ~50

Bias: ~100

Avg. Moon age: 14.02 days

Avg. Moon phase: 44.29%

Bortle Dark-Sky Scale: 5.00

Astrometry.net job: 2692130

RA center: 202.475 degrees

DEC center: 47.210 degrees

Pixel scale: 0.685 arcsec/pixel

Orientation: 262.528 degrees

Field radius: 0.289 degrees

Locations: Home Observatory, Schenectady, New York, United States

Data source: Backyard

Description

The Whirlpool Galaxy (M 51) is an interacting grand-design spiral galaxy. Its smaller companion is galaxy NGC 5195 and the pair lies in the constellation of Canes Venatici, close to the border with Ursa Major. Its distance is estimated to be between 15 and 35 million light-years.

It was discovered by Charles Messier in 1773 but it was William Parsons in 1845 who discovered that the Whirlpool had a spiral structure. It was only with Edwin Hubble's work on Cepheid variables that it was recognized that objects such as the Whirlpool Galaxy were much further away than the boundary of the Milky Way and had to be galaxies of their own.

Camera: ZWO ASI1600MM Pro (Gain 76, Offset 30 for LRGB, Gain 139, Offset 50 for Ha)

A: Minimally cropped field of view with TS ONTC 10in f4 and ASI1600 sensor.
B: Cropped field of view around M51.
C: Annotated field of view including galaxies in the PGC catalog. The magnitude of some of these galaxies is in the 18 to 20 range (depending on the band).
D: Tight crop of M51 with transient bright object AT2019abn (a so-called supernova impostor, see https://wis-tns.weizmann.ac.il/object/2019abn).

Comments

Author

lucam_astro
Luca Marinelli
License: None (All rights reserved)
5232
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Revisions

  • The Whirlpool Galaxy (Messier 51), 





    
        

            Luca Marinelli
    Original
  • Final
    The Whirlpool Galaxy (Messier 51), 





    
        

            Luca Marinelli
    B
  • The Whirlpool Galaxy (Messier 51), 





    
        

            Luca Marinelli
    C
  • The Whirlpool Galaxy (Messier 51), 





    
        

            Luca Marinelli
    D

B

Crop around M51.

C

Annotated image with galaxies in the PGC catalog.

D

Transient bright object AT2019abn (supernova impostor) in M51 in January and February 2019.

Sky plot

Sky plot

Histogram

The Whirlpool Galaxy (Messier 51), 





    
        

            Luca Marinelli