Open cluster M 47 (also known as Messier Object 47 or NGC 2422 ) is open clusters in the constellation of Korma .
| Open cluster M 47 | |
|---|---|
| Star cluster | |
 | |
| Research history | |
| Discoverer | Giovanni Battista Godierna |
| opening date | before 1654 |
| Designations | NGC 2422 , M 47 |
| Observational data ( Epoch J2000.0 ) | |
| Type of | Open cluster |
| Right ascension | |
| Declination | |
| Distance | 1600 St. years (490 pc ) |
| Visible magnitude (V) | 4.2 |
| Visible dimensions (V) | 30.0 ′ |
| Constellation | Stern |
| physical characteristics | |
| Class | II, 3, m |
| Radius | 6 sv. years old |
| Age | 78 million years |
Content
Opening History
The cluster was discovered by Giovanni Battista Goderna until 1654 and independently discovered by Charles Messier on February 19, 1771 .
Interesting features
M47 is approximately 1600 light-years from Earth . Its estimated age is about 78 million years. The cluster contains about 50 stars, the brightest of which have a magnitude of 5.7.
Observations
Russian astronomy lovers just as rarely see this cluster as the neighboring M 46 or, all the more so, the southern M 93 . All three are in the northern part of the constellation Korma - hardly accessible to observations from the territory of Russia. They rise somewhat high above the horizon on cold winter nights, when there are very few clear nights, and observations are far from being comfortable — during a clear winter night, the frost grows stronger by 10-15 ° C.
In the absence of extraneous light (from the moon and city lighting), the cluster M 47 is available for detection with the naked eye five degrees south of α Unicorn. It looks like a foggy dim asterisk. In good binoculars, the cluster appears as a close pile of a dozen stars (one and a half degrees west of the diffuse spot M 46 ). In a telescope of moderate aperture (127-180 mm), the cluster is allowed to dozens of stars of different brightness in the sky area approximately equal to the disk of the Moon. The brightest ten stars form a drawing of a crooked vessel or a not very symmetrical butterfly. Two of the bright stars are double (one is tight, the other is quite wide).
Neighbors in the sky from Messier's catalog
- M 46 - (to the east in one and a half degrees) a cluster more rich, but collected from more dim and identical on brightness of stars;
- M 93 - (10 degrees south) a dimmer and more compact cluster — interesting to observe in an aperture telescope;
- M 48 - (far to the northeast, in Hydra) a rich and bright, more accessible cluster of observations;
- M 50 - (to the north-west, in the Unicorn) compact cluster in the form of 8-ki;
- M 41 - (to the west, in the Great Psa near Sirius) a very rich and bright cluster, which seemed to be observed even in the time of Aristotle
The sequence of observation in the Messier Marathon
... M 93 → M 46 → M 47 → M 48 → M 67 ...
See also
- List of Messier Objects
- New Shared Directory