Messier 67

Messier 67
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)
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
	See also: Open cluster, List of open clusters

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 - K_S 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.

[webda-1] Paunzen, E.; Mermilliod, J.-C. "WEBDA page for open cluster NGC 2682". WEBDA. Retrieved 2022-10-12.

[sarajedini09-2] Sarajedini, Ata; Dotter, Aaron; Kirkpatrick, Allison (2009). "Deep 2MASS Photometry of M67 and Calibration of the Main-Sequence J - K_S 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.

[yakut09-3] 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.

[majaess11-4] 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.

[5] Martina McGovern. "M67 Open cluster". British Astronomical Association. Retrieved 2022-10-12.

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