| Messier 67 | |
|---|---|
 Open cluster Messier 67 in Cancer | |
| Observation data (J2000.0 epoch) | |
| Right ascension | 08h 51.3m |
| Declination | +11° 49′ |
| Distance | ~2.61–2.93 kly (800–900 pc[1][2][3][4]) |
| Apparent magnitude (V) | 6.1 |
| Apparent dimensions (V) | 30.0′ |
| Physical characteristics | |
| Radius | 10 ly[citation needed] |
| Estimated age | 3.2 to 5 billion years |
| Other designations | NGC 2682, Cr 204 |
| Associations | |
| Constellation | Cancer |
Messier 67 (also known as M67 or NGC 2682) and sometimes called the King Cobra Cluster or the Golden Eye Cluster[5] is an open cluster in the southern, equatorial half of Cancer. It was discovered by Johann Gottfried Koehler in 1779. Estimates of its age range between 3.2 and 5 billion years. Distance estimates are likewise varied, but typically are 800–900 parsecs (2,600–2,900 ly).[1][2][3][4] Estimates of 855, 840, and 815 pc were established via binary star modelling and infrared color-magnitude diagram fitting.[2][3][4]
- ^ a b Paunzen, E.; Mermilliod, J.-C. "WEBDA page for open cluster NGC 2682". WEBDA. Retrieved 2022-10-12.
- ^ a b c Sarajedini, Ata; Dotter, Aaron; Kirkpatrick, Allison (2009). "Deep 2MASS Photometry of M67 and Calibration of the Main-Sequence J - KS Color Difference as an Age Indicator". The Astrophysical Journal. 698 (2): 1872–1878. arXiv:0904.2907. Bibcode:2009ApJ...698.1872S. doi:10.1088/0004-637X/698/2/1872. S2CID 11654120.
- ^ a b c Yakut, K.; Zima, W.; Kalomeni, B.; Van Winckel, H.; Waelkens, C.; De Cat, P.; Bauwens, E.; Vučković, M.; Saesen, S.; Le Guillou, L.; Parmaksızoğlu, M.; Uluç, K.; Khamitov, I.; Raskin, G.; Aerts, C. (2009). "Close binary and other variable stars in the solar-age Galactic open cluster M 67". Astronomy and Astrophysics. 503 (1): 165. arXiv:0906.4908. Bibcode:2009A&A...503..165Y. doi:10.1051/0004-6361/200911918. S2CID 1136371.
- ^ a b c Majaess, Daniel J.; Turner, David G.; Lane, David J.; Krajci, Tom (2011). "Deep Infrared ZAMS Fits to Benchmark Open Clusters Hosting delta Scuti Stars". Journal of the American Association of Variable Star Observers (Jaavso). 39 (2): 219. arXiv:1102.1705. Bibcode:2011JAVSO..39..219M.
- ^ Martina McGovern. "M67 Open cluster". British Astronomical Association. Retrieved 2022-10-12.