Messier 7

Messier 7
Messier 7
Observation data (J2000.0 epoch)
Right ascension	17h 53m 51.2s
Declination	−34° 47′ 34″
Distance	980 ± 33 ly (300 ± 10 pc)
Apparent magnitude (V)	3.3
Apparent dimensions (V)	80.0′
Physical characteristics
Mass	735 M☉
Radius	25 ly
Estimated age	200 Myr
Other designations	Ptolemy Cluster, M7, NGC 6475, Cr 354
Associations
Constellation	Scorpius
	See also: Open cluster, List of open clusters

Messier 7 or M7, also designated NGC 6475 and sometimes known as Ptolemy's Cluster,^[4]^[5] is an open cluster of stars in the constellation of Scorpius. The cluster is easily detectable with the naked eye, close to the "stinger" of Scorpius. With a declination of −34.8°, it is the southernmost Messier object.

Observations

M7 has been known since antiquity; it was first recorded by the 2nd-century Greek-Roman astronomer Ptolemy, who described it as a nebula in 130 AD.^[6] Italian astronomer Giovanni Batista Hodierna observed it before 1654 and counted 30 stars in it. In 1764, French astronomer Charles Messier catalogued the cluster as the seventh member in his list of comet-like objects. English astronomer John Herschel described it as "coarsely scattered clusters of stars".^[4] In Chinese astronomy it is identified as Yú, the Fish (simplified Chinese: 鱼; traditional Chinese: 魚).^[5]^[7]

Telescopic observations of the cluster reveal about 80 stars within a field of view of 1.3° across. At the cluster's estimated distance of 980 light years this corresponds to an actual diameter of 25 light years. The tidal radius of the cluster is 40.1 ly (12.3 pc) and it has a combined mass of about 735 times the mass of the Sun.^[3] The age of the cluster is around 200^[2] million years while the brightest member star is of magnitude 5.6. In terms of composition, the cluster contains a similar abundance of elements other than hydrogen and helium as the Sun.^[2]

On August 29, 2006, Messier 7 was used for first light image of the Long Range Reconnaissance Imager (LORRI) telescope on the Pluto-bound New Horizons spacecraft.^[8]

As of January 2022, Messier 7 is one of the few remaining Messier objects not photographed by the Hubble Space Telescope.^[9] This is mainly due to those objects' angular diameter or lack of scientific significance. Most such objects are open clusters of large angular diameter that would require thousands of photos due to Hubble's small field of view. (For comparison, Hubble's well known panoramic photo of the Andromeda Galaxy, covering less than half of our galactic neighbor, required approximately 400 individual movements and 7400 exposures.)^[10]

Brightest members

Messier 7 contains over a thousand likely members stars spread across several degrees. Members brighter than about 8th magnitude have evolved away from the main sequence, with the most luminous main sequence stars around spectral class A0. The brightest stars with a membership probability higher than 75%:^[11]

Designation	Right ascension	Declination	Apparent magnitude	Spectral type
HD 162391^[12]	17^h 52^m 19.76^s	−34° 25′ 00.6″	5.53	G8/K0III^[13]
HD 162496^[14]	17^h 52^m 49.22^s	−34° 06′ 06.5″	5.68	K1III^[15]
V957 Sco^[16]	17^h 52^m 13.66^s	−34° 47′ 57.1″	5.86	B5IIIp^[17]
HD 162587^[18]^[a]	17^h 53^m 23.47^s	−34° 53′ 42.4″	5.98	K1III^[20]
HD 162515^[21]	17^h 52^m 55.77^s	−34° 01′ 08.0″	6.53	B9III^[22]
HD 163274^[23]	17^h 56^m 50.03^s	−34° 41′ 20.0″	6.65	B9III/IV^[24]
HD 163139^[25]	17^h 56^m 07.88^s	−34° 02′ 56.1″	6.73	B9.51III^[26]
HD 162780^[27]	17^h 54^m 14.38^s	−34° 43′ 39.5″	6.86	B9.5III+n^[28]
HD 162888^[29]	17^h 54^m 47.88^s	−34° 32′ 31.8″	6.92	A0IIIn^[30]
HD 161575^[31]	17^h 47^m 47.55^s	−34° 18′ 38.5″	6.93	B9III(pSi)^[32]
V958 Sco^[33]	17^h 53^m 15.98^s	−34° 37′ 15.1″	6.94	B8/9III^[34]

^ Not in Gaia DR2, so doesn't appear in Cantat-Gaudin & Anders, but generally considered to be a member.^[19]

Gallery

M7 on the night sky. It is easily visible to the naked eye and located between the constellations Scorpius and Sagittarius.
Broader view of M7, with the cluster at the center of the image

References

^ ^a ^b "MESSIER 007", NASA/IPAC Extragalactic Database, NASA, retrieved 2012-04-19
^ ^a ^b ^c ^d Villanova, S.; Carraro, G.; Saviane, I. (September 2009), "A spectroscopic study of the open cluster NGC 6475 (M 7). Chemical abundances from stars in the range Teff = 4500-10 000 K", Astronomy and Astrophysics, 504 (3): 845–852, arXiv:0906.4330, Bibcode:2009A&A...504..845V, doi:10.1051/0004-6361/200811507, S2CID 17534818
^ ^a ^b Piskunov, A. E.; et al. (January 2008), "Tidal radii and masses of open clusters", Astronomy and Astrophysics, 477 (1): 165–172, Bibcode:2008A&A...477..165P, doi:10.1051/0004-6361:20078525
^ ^a ^b Gendler, Robert; Christensen, Lars Lindberg; Malin, David (2011), Treasures of the Southern Sky: A Photographic Anthology, Springer, p. 139, ISBN 978-1461406273
^ ^a ^b Ridpath, Ian. "Star Tales - Scorpius". Retrieved 21 July 2025.
^ Jones, Kenneth Glyn (1991), Messier's Nebulae and Star Clusters, The Practical astronomy handbook series (2ns ed.), Cambridge University Press, p. 1, ISBN 978-0521370790
^ "AEEA 天文教育資訊網" [Activities of Exhibition and Education in Astronomy] (in Chinese). Archived from the original on 30 September 2007.
^ "LORRI's First Light1". pluto.jhuapl.edu. Retrieved 2018-10-24.
^ "Explore - the Night Sky | Hubble's Messier Catalog". 28 August 2017.
^ "Hubble's High-Definition Panoramic View of the Andromeda Galaxy". 24 March 2015.
^ Cantat-Gaudin, T.; Anders, F. (2020). "Clusters and mirages: Cataloguing stellar aggregates in the Milky Way". Astronomy and Astrophysics. 633: A99. arXiv:1911.07075. Bibcode:2020A&A...633A..99C. doi:10.1051/0004-6361/201936691.
^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ Reddy, Arumalla B. S.; Lambert, David L. (2019). "Comprehensive abundance analysis of red giants in the open clusters Stock 2, NGC 2168, 6475, 6991, and 7762". Monthly Notices of the Royal Astronomical Society. 485 (3): 3623. arXiv:1902.02939. Bibcode:2019MNRAS.485.3623R. doi:10.1093/mnras/stz468.
^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.

External links

[20] Not in Gaia DR2, so doesn't appear in Cantat-Gaudin & Anders, but generally considered to be a member.^[19]

[NED-1] "MESSIER 007", NASA/IPAC Extragalactic Database, NASA, retrieved 2012-04-19

[aaa504_3_845-2] Villanova, S.; Carraro, G.; Saviane, I. (September 2009), "A spectroscopic study of the open cluster NGC 6475 (M 7). Chemical abundances from stars in the range Teff = 4500-10 000 K", Astronomy and Astrophysics, 504 (3): 845–852, arXiv:0906.4330, Bibcode:2009A&A...504..845V, doi:10.1051/0004-6361/200811507, S2CID 17534818

[aaa477_1_165-3] Piskunov, A. E.; et al. (January 2008), "Tidal radii and masses of open clusters", Astronomy and Astrophysics, 477 (1): 165–172, Bibcode:2008A&A...477..165P, doi:10.1051/0004-6361:20078525

[gendler2011-4] Gendler, Robert; Christensen, Lars Lindberg; Malin, David (2011), Treasures of the Southern Sky: A Photographic Anthology, Springer, p. 139, ISBN 978-1461406273

[Ridpath-5] Ridpath, Ian. "Star Tales - Scorpius". Retrieved 21 July 2025.

[jones1991-6] Jones, Kenneth Glyn (1991), Messier's Nebulae and Star Clusters, The Practical astronomy handbook series (2ns ed.), Cambridge University Press, p. 1, ISBN 978-0521370790

[AEEA-7] "AEEA 天文教育資訊網" [Activities of Exhibition and Education in Astronomy] (in Chinese). Archived from the original on 30 September 2007.

[8] "LORRI's First Light1". pluto.jhuapl.edu. Retrieved 2018-10-24.

[9] "Explore - the Night Sky | Hubble's Messier Catalog". 28 August 2017.

[10] "Hubble's High-Definition Panoramic View of the Andromeda Galaxy". 24 March 2015.

[cg2020-11] Cantat-Gaudin, T.; Anders, F. (2020). "Clusters and mirages: Cataloguing stellar aggregates in the Milky Way". Astronomy and Astrophysics. 633: A99. arXiv:1911.07075. Bibcode:2020A&A...633A..99C. doi:10.1051/0004-6361/201936691.

[12] Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[13] Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.

[14] Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[15] Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.

[16] Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[17] Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.

[18] Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[19] Reddy, Arumalla B. S.; Lambert, David L. (2019). "Comprehensive abundance analysis of red giants in the open clusters Stock 2, NGC 2168, 6475, 6991, and 7762". Monthly Notices of the Royal Astronomical Society. 485 (3): 3623. arXiv:1902.02939. Bibcode:2019MNRAS.485.3623R. doi:10.1093/mnras/stz468.

[21] Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.

[22] Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[23] Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.

[24] Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[25] Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.

[26] Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[27] Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.

[28] Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[29] Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.

[30] Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[31] Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.

[32] Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[33] Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.

[34] Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[35] Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.

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[15]

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[25]

[26]

[27]

[28]

[29]

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[31]

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[33]

[34]

[19]

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6501 to 6600	6503 6505 6509 6514 6520 6522 6523 6526 6528 6530 6531 6533 6535 6537 6539 6540 6541 6543 6544 6553 6558 6559 6560 6563 6565 6566 6569 6570 6572 6578 6584 6589 6590
6601 to 6700	6603 6604 6605 6611 6613 6618 6621 6622 6624 6626 6629 6633 6637/6634 6638 6642 6644 6646 6649 6656 6664 6670 6676 6681 6685 6694
6701 to 6800	6705 6709 6712 6715 6717 6720 6723 6729 6738 6741 6742 6744 6745 6748 6751 6752/6777 6753 6754 6755 6756 6760 6769 6774 6778/6785 6779 6781 6782 6786 6789 6790 6791
6801 to 6900	6800 6801 6809 6810 6811 6814 6818 6819 6820 and 6823 6822 6826 6834 6838 6842 6845 6850 6853 6857 6861 6863 6864 6866 6871 6872 6881 6884/6766 6885 6886 6888 6891
6901 to 7000	6902 6905 6907 6910 6913 6914 6925 6934 6939 6940 6946 6948 6951 6952 6956 6960, 6974, 6979, 6992, and 6995 6962 6975/6976 6981 6984 6989 6994 7000
Astronomical catalog List of NGC objects 6001–7000

Messier 7

Observation data (J2000.0 epoch)
Right ascension	17^h 53^m 51.2^s^[1]
Declination	−34° 47′ 34″^[1]
Distance	980 ± 33 ly (300 ± 10 pc)^[2]
Apparent magnitude (V)	3.3
Apparent dimensions (V)	80.0′
Physical characteristics
Mass	735^[3] M_☉
Radius	25 ly
Estimated age	200 Myr^[2]
Other designations	Ptolemy Cluster, M7, NGC 6475, Cr 354
Associations
Constellation	Scorpius
See also: Open cluster, List of open clusters