The globular cluster M 14 (also known as M 14 or NGC 6402 ) is a globular star cluster in the constellation Ophiuchus .
| Ball cluster M 14 | |
|---|---|
| Star cluster | |
 | |
| Research history | |
| Discoverer | Charles Messier |
| opening date | 1764 |
| Designations | NGC 6402 , M 14 |
| Observational data ( Age J2000.0 ) | |
| Type of | Globular cluster |
| Right ascension | |
| Declination | |
| Distance | 30 300 St. years (9300 pc ) |
| Visible magnitude (V) | 7.6 |
| Visible Dimensions (V) | 11,0 ′ |
| Constellation | Ophiuchus |
| physical characteristics | |
| Class | VIII |
| Radius | 50 St. years |
| Absolute magnitude (V) | |
Content
- 1 Discovery History
- 2 Interesting features
- 3 Observations
- 3.1 Neighbors in the sky from the Messier catalog
- 3.2 Sequence of observation at the Messier Marathon
- 4 Images
- 5 See also
- 6 notes
- 7 References
Discovery History
It was discovered by Charles Messier in 1764 .
Interesting features
Located at a distance of 30,300 light-years , M 14 contains several hundred thousand stars. The total luminosity M 14 is 400 thousand times greater than the solar luminosity , which corresponds to an absolute magnitude of −9.12 m . M 14 extends 100 light-years across.
About 70 variable stars are known in the cluster, many of which belong to the Virgo class W , typical of globular clusters. In 1938, a new one appeared in the cluster, although it was not seen until 1964 when the photographic plates of that time were studied. According to estimates, the new one reached a maximum of +9.2 stellar magnitude, which is 5 times brighter than the brightest “normal” star in the cluster.
Observations
This globular cluster lies in the summer constellation part of Ophiuchus poor with landmarks and finding an object, even with good binoculars or a telescope finder, is not an easy task. M 14 is located just south of the middle of the segment connecting ν and σ Ophiuchus. With binoculars, the cluster is barely noticeable. The cluster is allowed to stars on the periphery only in a telescope with an aperture of 200 mm or more.
About 3 ° southwest of M 14 (next to the 4.5m star) is a very dim globular cluster NGC 6366 .
Neighbors in the Sky from Messier Catalog
- M 10 and M 12 - (to the west - closer to the center of Ophiuchus) a pair of rather bright and different clusters;
- M 9 - (on the southern outskirts of Ophiuchus) less concentrated and not so rich;
- M 11 - (in the east, in the Shield) one of the most beautiful open clusters of the summer sky.
Sequence of Observation at the Messier Marathon
... M 4 → M 29 → M 14 → M 9 → M 71 ...
Images
Gal. Longitude 21.3239 °
Gal. Latitude + 14.8044 °
Distance 30 300 St. years
See also
- List of Messier objects
- New General Catalog
Notes
- ↑ Harris W. E. A catalog of parameters for globular clusters in the Milky Way // Astron. J. / J. G. III - IOP Publishing , 1996. - Vol. 112, Iss. 4. - P. 1487. - ISSN 0004-6256 ; 1538-3881 - doi: 10.1086 / 118116