Messier 38
The cluster's brightest stars form a pattern resembling the Greek letter Pi or, according to Webb, an "oblique cross". Walter Scott Houston described its appearance as follows:
Photographs usually show a departure from circularity, a feature quite evident to visual observers. Older reports almost always mention a cross shape, which seems more pronounced with small instruments. A view with a 24-inch reflector on a fine Arizona night showed the cluster as irregular, and the host of stars made fruitless any effort to find a geometrical figure.
At its distance of 1066 pc., its angular diameter of about 20 arc minutes corresponds to about 4.0 parsecs (13 light years), similar to that of its more distant neighbor M37. It is of intermediate age at about 290 million years. From the population of about 100 stars, this open cluster features a prominent yellow giant with the apparent magnitude +7.9 and spectral type G0 as its brightest member. This corresponds to an absolute magnitude of -1.5, or a luminosity of 900 Suns. For comparison, the Sun would appear as a faint magnitude +15.3 star from the distance of M38.
Components
![](http://upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Star_map_-_M38_cluster.png/250px-Star_map_-_M38_cluster.png)
NAME | Right ascension |
Declination | Spectral Type |
---|---|---|---|
HD 35519 | 05 26 54.32 | +35° 27' 26.2 | K2 |
NGC 1912 HOAG 2 | B5II-III | ||
NGC 1912 HOAG 3 | |||
NGC 1912 HOAG 4 | 05 28 35.39 | +35° 52' 51.2' | A0V |
NGC 1912 HOAG 5 | 05 28 50.73 | +35° 46' 47.2 | A0Vn |
NGC 1912 HOAG 6 | 05 28 10.46 | +35° 55' 26.0 | A0:V |
NGC 1912 HOAG 7 | 05 28 34.25 | +35° 53' 29.7 | A2V |
NGC 1912 HOAG 11 | |||
NGC 1912 HOAG 19 | K2IIIb | ||
NGC 1912 HOAG 104 | G5III | ||
NGC 1912 SS G2 | |||
NGC 1912 HOAG 128 | K0III | ||
NGC 1912 SS G4 | A5:V | ||
NGC 1912 HOAG 153 | K0V | ||
NGC 1912 SS G3 | A3V | ||
NGC 1912 HOAG 160 | K1IV | ||
NGC 1912 HOAG 161 | G5V | ||
NGC 1912 HOAG 171 | G7IV | ||
NGC 1912 HOAG 172 |