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Name / Constellation

M 47

Other: NGC 2422, Mel 68, Cr 152, 2422, OCL 596, Lund 356, H VIII-38, h 459, h 3088, GC 1551, GC 1594

Pup

Coordinates AR: 07h 36m 35,0s- Dec: -14° 29′ 00″
Optics Takahashi FSQ 106N APO Fluorite F5 - 60/220 guiding refractor
Camera-Mount SBIG STF8300M - Orion StarShot Guider - 10Micron GM2000 QCI Mount
Filters Baader LRGB
Exposure
  • Lum
  • Red
  • Green
  • Blue
  • 10 x 180 sec - 30 min
  • 10 x 180 sec - 30 min
  • 10 x 180 sec - 30 min
  • 10 x 180 sec - 30 min
  • UNBINNED
  • BINNING 2X2
  • BINNING 2X2
  • BINNING 2X2
Location / Date Promiod (Valle D'Aosta-Italy) "TLP" Remote Observatory - 24 mar 2019
Seeing About 3.5 - 4" @ 2.1 arcosec/pixel unbinned
Note Bad seeing
Acquisition MaxIm DL - CCD Autopilot 5
Processing Adobe Photoshop CS6 -
Comment

Messier 47 (M47 or NGC 2422) is an open cluster in the constellation Puppis. It was discovered by Giovanni Batista Hodierna before 1654 and independently discovered by Charles Messier on February 19, 1771. It was later independently discovered again, under the current name NGC 2422. There is actually no cluster in the position indicated by Messier, which he expressed in terms of its right ascension and declination with respect to the star 2 Puppis. However, if the signs of Messier's coordinate differences are changed, the position matches that of NGC 2422. Until the equivalency of M47 with NGC 2422 was found, M47 was considered a lost Messier Object. The discovery that M47 and NGC 2422 were the same cluster only came in 1959 with a realization by Canadian astronomer T. F. Morris. M47 is at a distance of about 1,600 light-years from Earth with an estimated age of about 78 million years. The member stars of M47 have been measured down to about red dwarfs at apparent magnitude 19. There are around 500 members, the brightest being 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 several bright red giants. M47 is located about a degree away from Messier 46, which is much older and much further away.