Hemisphere:  Northern  ·  Constellation: Gemini (Gem)  ·  Contains:  M 35  ·  NGC 2158  ·  NGC 2168
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Open clusters M35 and NGC2158, in Gemini, 



    
        

            Steven Bellavia
Open clusters M35 and NGC2158, in Gemini
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Open clusters M35 and NGC2158, in Gemini

Technical card

Imaging telescopes or lenses: Borg 90FL

Imaging cameras: ZWO ASI 183MM Pro

Mounts: Sky-Watcher EQ-6R Pro SynScan

Guiding telescopes or lenses: The Bellavia Basic 50mm f/6 guidescope

Guiding cameras: ZWO ASI 290MC

Focal reducers: Borg 0.72X Quadruplet Super Reducer, #7872

Filters: R  ·  B  ·  G


Dates:Feb. 4, 2021

Frames:
B: 30x60" (gain: 100.00) -15C bin 1x1
G: 30x60" (gain: 100.00) -15C bin 1x1
R: 30x60" (gain: 100.00) -15C bin 1x1

Integration: 1.5 hours

Darks: ~30

Flats: ~30

Flat darks: ~30

Avg. Moon age: 21.88 days

Avg. Moon phase: 52.83%

Bortle Dark-Sky Scale: 4.00

Mean SQM: 20.80

Mean FWHM: 4.50

Temperature: -5.00


Basic astrometry details

Astrometry.net job: 4202760

RA center: 6h 8' 53"

DEC center: +24° 15' 14"

Pixel scale: 2.118 arcsec/pixel

Orientation: 353.748 degrees

Field radius: 0.799 degrees


Resolution: 1920x1920

Data source: Backyard

Description

Messier 35 (M35) is a large open star cluster located in the northern constellation Gemini. The cluster consists of several hundred stars, of which 120 are brighter than magnitude 13. The central region has a density of 6.21 stars per cubic parsec.
M35 has the Trumpler classification III 3 r, which means that it is detached from the surrounding star field with no noticeable concentration (III), that it contains both bright and faint stars (3) and that it is richly populated (r) with more than 100 stars.
The cluster has an apparent magnitude of 5.3 and lies at an approximate distance of 2,800 light years from Earth. It has the designation NGC 2168 in the New General Catalogue.
Messier 35 is the only Messier object in Gemini. The best time of year to observe it from northern latitudes is in the winter months, when the constellation is high overhead. M35 lies near the border with Taurus.

NGC 2158 is an open cluster in the constellation of Gemini. It is, in angle, immediately southwest of open cluster Messier 35, and is believed to be about 2 billion years old. The two clusters are unrelated, as NGC2158 is over 8,000 light years further away, at 11,000 light years distance.
Once thought to be a globular cluster, it is now known to be an intermediate-age, metal-poor open cluster that is a member of the old thin disk population.

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Open clusters M35 and NGC2158, in Gemini, 



    
        

            Steven Bellavia