M38 open cluster
|Observation data (J2000.0 epoch)|
|Right ascension||5h 28m 42s|
|Declination||+35° 51′ 18″|
|Distance||(1.066 kpc (3,480 ly))|
|Apparent magnitude (V)||7.4|
|Apparent dimensions (V)||21′|
|Radius||4pc. (13 ly.)|
|Estimated age||290 Ma|
|Other designations||NGC 1912|
Messier 38 (also known as M38 or NGC 1912) is an open cluster in the constellation of Auriga. It was discovered by Giovanni Batista Hodierna before 1654 and independently found by Le Gentil in 1749. Open cluster M36 and M37, also discovered by Hodierna, and often grouped together with M38. Distance is about 1.066 kpc (3,480 ly) away from Earth.
The cluster's brightest stars form a pattern resembling the Greek letter Pi or, according to Webb, an "oblique cross." 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.
"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."
|HD 35519||05h 26m 54.32s||+35° 27' 26.2||K2|
|NGC 1912 HOAG 2||B5II-III|
|NGC 1912 HOAG 3|
|NGC 1912 HOAG 4||05h 28m 35.39s||+35° 52' 51.2||A0V|
|NGC 1912 HOAG 5||05h 28m 50.73s||+35° 46' 47.2||A0Vn|
|NGC 1912 HOAG 6||05h 28m 10.46s||+35° 55' 26.0||A0:V|
|NGC 1912 HOAG 7||05h 28m 34.25s||+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|
- "WEBDA page for open cluster NGC 1912". Department of Theoretical Physics and Astrophysics of the Masaryk University. Retrieved 18 February 2018.
- Majaess D. J.; Turner D.; Lane D. (2007). "In Search of Possible Associations between Planetary Nebulae and Open Clusters". Publications of the Astronomical Society of the Pacific. 119: 1349. arXiv:0710.2900. Bibcode:2007PASP..119.1349M. doi:10.1086/524414.
- "WEBDA page Lynga catalogue data". Department of Theoretical Physics and Astrophysics of the Masaryk University. Retrieved 18 February 2018.
- Houston, Walter Scott (2005). Deep-Sky Wonders. Sky Publishing Corporation. ISBN 1-931559-23-6.
- Messier 38, SEDS Messier pages
- Messier 38 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
- NASA Astronomy Picture of the Day: Open Star Cluster M38 (7 January 2003)