Hemisphere:  Northern  ·  Constellation: Draco (Dra)  ·  Contains:  NGC 3147
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Dwarf nova (CP Draconis) outburst (?) near NGC 3147, 



    
        

            rhedden
Dwarf nova (CP Draconis) outburst (?) near NGC 3147
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Dwarf nova (CP Draconis) outburst (?) near NGC 3147

Getting plate-solving status, please wait...
Dwarf nova (CP Draconis) outburst (?) near NGC 3147, 



    
        

            rhedden
Dwarf nova (CP Draconis) outburst (?) near NGC 3147
Powered byPixInsight

Dwarf nova (CP Draconis) outburst (?) near NGC 3147

Technical card

Imaging telescopes or lenses: Edge HD 1100

Imaging cameras: QSI 660 WS

Mounts: Software Bisque Paramount MX

Guiding telescopes or lenses: Edge HD 1100

Focal reducers: Celestron f/7 reducer for Edge 1100 HD

Software: GIMP  ·  Deep Sky Stacker  ·  Software Bisque The SkyX Professional

Filters: Astrodon 31mm LRGB E Series Gen 2 1.25"

Accessory: Starlight Xpress Lodestar X2


Dates:March 9, 2021March 15, 2021

Frames:
Astrodon 31mm LRGB E Series Gen 2 1.25": 33x160" (1h 28') -20C bin 2x2
Astrodon 31mm LRGB E Series Gen 2 1.25": 66x80" (1h 28') -20C bin 2x2

Integration: 2h 56'

Avg. Moon age: 13.81 days

Avg. Moon phase: 9.91%

Bortle Dark-Sky Scale: 4.00


Basic astrometry details

Astrometry.net job: 4313145

RA center: 10h 16' 26"

DEC center: +73° 24' 43"

Pixel scale: 0.461 arcsec/pixel

Orientation: 128.137 degrees

Field radius: 0.168 degrees


Resolution: 2104x1564

Locations: Back Yard - New York, Pittstown, NY, United States

Data source: Backyard

Description

While comparing two luminance stacks on NGC 3147 taken on the evenings of 3/9/2021 and 3/15/2021, I noticed a dramatic brightening of a tiny object. Since the object was essentially stationary for about two hours on 3/15, I do not think it is an asteroid.

EDIT: Thanks to some research from Cloudy Nights members Migwan and Dan Crowson, it appears that the image probably shows a superoutburst of the dwarf nova CP Draconis. The AAVSO site says this star is a SU Ursae Majoris variable, and its recent observations can be viewed here:

https://app.aavso.org/webobs/results/?star=000-BBR-288&num_results=200

Sorry for the hasty effort at processing. The two images in the gif are median-combined luminance stacks with a similar stretch. The "pretty picture" version of NGC 3147 is coming later this week. :)

Comments

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Dwarf nova (CP Draconis) outburst (?) near NGC 3147, 



    
        

            rhedden