Collinder 11
Collinder 11 is an open star cluster in the constellation Cassiopeia, also known as Cr 11 and NGC 436.
It is a small, compact group of stars about 9,800 light-years away (roughly 3 kiloparsecs), spanning around 5 arcminutes.
It stands out as a tight clump of mostly faint stars, which William Herschel described in 1787 as a small, compressed cluster of irregular shape.
It sits about 1° northwest of the much better known Owl Cluster (NGC 457) and is estimated to be about 84 million years old.
At magnitude 8.8 it is a modest target for binoculars or a small telescope.
Object Data
Collinder:Cr 11
Also known as:NGC 436, Her H VII-45, H400 15, Mel 6, OCL 320
Type:Open cluster
Constellation:Cassiopeia
Distance:9,800 ly
Observation Data
Location:Pollux Observatory, Zuidlaren
Date:2019-10-31
Technical Data
Exposure time:IR/UV cut- 96 x 30 sec
Total: 0.8 h
Total: 0.8 h
Telescope:Takahashi FSQ106 ED
Camera:ZWO ASI 294mc Pro (OSC)
Color palette:RGB
Filters:Baader planetarium