Herschel 390 and Messier 47

Date: 27 Demember 2024

Altitude: 45 - 47 degrees

Angular Size: 1° 00' x 0° 45'

Orientation: North up; East left

Pixel scale: 1.30" per pixel

Total exposure time: 43 minutes

B filter: 44 x 24 seconds

V filter: 44 x 18 seconds

R filter: 44 x 16 seconds

Herschel 390 is also known as Messier 47 and NGC 2478

Open cluster: Trumpler class III2m

Constellation: Puppis

Diameter: 16 light years

Distance: 1,600 light years

Age: 78 million years

Notes

There are around 500 members stars, some as faint as magnitude 19. The brightest is HD

60855, a magnitude 5.7 Be star. The cluster is dominated by hot class B main sequence and

giant stars, but a noticeable colour contrast comes from its brightest red giants.

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