Mercer 3

Mercer 3
Mercer 3
Observation data (J2000 epoch)
Constellation Scutum
Right ascension 18h 18m 30s[1]
Declination −16° 58′ 36″[1]
Distance 13–26 kly (4–8 kpc[1])
Apparent magnitude (V) not visible
Apparent dimensions (V) 39″ (half-light diameter)[1]
Physical characteristics
Mass 2–3 × 105 M☉
Radius 2–5 ly
Estimated age 12 Gyr[1]
See also: Globular cluster, List of globular clusters

Mercer 3 is a heavily obscured globular cluster embedded in the disk of the Milky Way galaxy.[1] It was discovered in 2008 in the data obtained by 2MASS and GLIMPSE infrared surveys. The cluster is located in the Scutum constellation. It had avoided detection for such a long time due to the extremely strong foreground extinction in its direction reaching 24 magnitudes in the visible light. Mercer 3 is probably situated at the distance from 4 to 8 kpc from the Sun and has a half-light radius of 0.7–1.5 pc.[1]

Mercer 3 is an old globular cluster having the age of about 12 billion years. The mass of cluster is estimated at 2–3 hundred thousand solar masses.[1]

References

  1. ^ a b c d e f g h Strader, J.; Kobulnicky, H. A. (2008). "A Probable New Globular Cluster in the Galactic Disk". The Astronomical Journal 136 (5): 2102. Bibcode 2008AJ....136.2102S. doi:10.1088/0004-6256/136/5/2102.  edit
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