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Name / Constellation

M 10

 Other: NGC 6254

Oph
Coordinates AR: 16h 57m 08.99s, -04° 05′ 57.6″
Optics Officina Stellare 10" f8 Richtey-Cretien
Camera-Mount PLAYERONE POSEIDON M-PRO - ZWO ASI 1600M (ONAG)- 10Micron GM2000 QCI Mount
Filters Antlia V-Pro LRGB
Exposure
  • Red
  • Green
  • Blue
  • 4 x 300 sec - 20 min
  • 4 x 300 sec - 20 min
  • 4 x 300 sec - 20 min
  • Binning 3
  • Binning 3
  • Binning 3
Location / Date Promiod (Valle D'Aosta-Italy) "TLP" Remote Observatory - Jul 2024
Seeing 2.6" @ 1.17 arcosec/pixel binning 3
Note Drizzle 2X in postprocessing (Pixinsight))
Acquisition N.I.N.A.
Processing Adobe Photoshop CC -
Comment

 

M 10 (also known as NGC 6254) is a globular cluster located in the constellation of Ophiuchus.

M10 is not easily identified because of its particularly isolated position, far from bright stars; its position is located about 10° east of the star ε Ophiuchi. Thanks to its magnitude of 6.6, the cluster is easily visible with binoculars.

M10 was discovered by Charles Messier in 1764, who however did not recognize it as a cluster and described it as follows: "A starless nebula in the belt of Ophiuchus, near the 30th star of this constellation...This nebula is beautiful and round, can only be seen with difficulty in an ordinary three-foot telescope." It was resolved into stars for the first time by William Herschel.
The cluster is one of the closest to us since it is only 14,000 light years away. Despite a modest diameter of only 60 light years, its apparent diameter is quite large, exceeding half the diameter of the full Moon.
The cluster has few variable stars, containing only 3. The brightest stars in the cluster have an apparent magnitude of 13. Its recession velocity with respect to us is 69 km/s.