Hemisphere:  Northern  ·  Constellation: Canes Venatici (CVn)
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Upgren1 - Open cluster remnant, 


            Fabio Mirra
Upgren1 - Open cluster remnant
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Upgren1 - Open cluster remnant

Technical card

Imaging telescopes or lenses: GSO RC 8''

Imaging cameras: Moravian G2-4000

Mounts: Avalon Instruments Avalon Linear Fast Reverse

Guiding cameras: Starlight Xpress Lodestar X2

Software: Pixinsight 1.8  ·  Main Sequence Software Sequence Generator Pro

Filters: Astronomik Deep-Sky G Filter  ·  Astronomik Deep-Sky B Filter

Accessory: Starlight Instruments Focuser Boss 2 + HSM20  ·  QHY PoleMaster  ·  Skymeca 2.5'' OAG

Dates:Feb. 20, 2021

Astronomik Deep-Sky B Filter: 33x180" -20C bin 1x1
Astronomik Deep-Sky G Filter: 35x180" -20C bin 1x1
Astronomik Deep-Sky R Filter: 37x180" -20C bin 1x1

Integration: 5.2 hours

Avg. Moon age: 8.02 days

Avg. Moon phase: 56.80%

Basic astrometry details

Astrometry.net job: 4242663

RA center: 12h 35' 12"

DEC center: +36° 17' 9"

Pixel scale: 0.946 arcsec/pixel

Orientation: 1.102 degrees

Field radius: 0.372 degrees

Resolution: 1984x2025

Locations: Home, Geneva, Switzerland

Data source: Backyard


There isn't a lot of information concerning this very old open cluster, except some info found in an article of the Astronomical Society of the Pacific stating that :

-"If the group is real (real cluster), it is a very ununsual open cluster. The member stars are very unlikely to be in orbital motion about each othre, thus it is most probable that the group is a residual core of a small open cluster whose fainter and less massive members have had time to dissociate from the loosely bound group. It seems to be an old open cluster near the end of it's life."

Moon was there, I took time to look at something ununsual from my polluted urban sky.