Copeland Septet - Misplaced Pages

Group of galaxies in the constellation Leo

Observation data (Epoch J2000)
A group of galaxies nicknamed the Copeland Septet, in the constellation of Leo.
Constellation(s)	Leo
Right ascension	11 37 50.5
Declination	+21° 59′ 06″
Brightest member	NGC 3753
Redshift	0.0304
Distance	132 Mpc (431 Mly) h _67.3
Binding mass	(6.1±1.0)×10 h _50.00 `M`_☉
X-ray luminosity	10 erg·s
Other designations
HCG 57

The Copeland Septet (also Copeland's Septet, Hickson Compact Group 57) is a group of galaxies in the constellation Leo that includes NGC 3748, NGC 3754, NGC 3750, NGC 3751, NGC 3745, NGC 3753 and NGC 3746. The group was discovered by British astronomer Ralph Copeland in 1874. The location of Copeland's Septet is right ascension 11 37 50 / declination +21° 59′ (2000.0), about three degrees northwest of third magnitude star 93 Leonis.

The redshift of the brightest member, NGC 3753 places Copelands Septet as a part of the Coma Supercluster.

References

"Giant Map of the Sky Sets Stage for Ambitious DESI Survey". Retrieved 3 February 2021.
^ Mahdavi, Andisheh; Geller, Margaret J. (2001). "The L_X − σ Relation for Galaxies and Clusters of Galaxies". The Astrophysical Journal. 554 (2): L129–L132. arXiv:astro-ph/0105315. Bibcode:2001ApJ...554L.129M. doi:10.1086/321710. S2CID 118106523.
^ Alatalo, K.; et al. (November 2014). "Strong Far-infrared Cooling Lines, Peculiar CO Kinematics, and Possible Star-formation Suppression in Hickson Compact Group 57". The Astrophysical Journal. 795 (2). arXiv:1409.5482. Bibcode:2014ApJ...795..159A. doi:10.1088/0004-637X/795/2/159. 159.
^ Fukazawa, Yasushi; et al. (August 2002). "Extended Thermal X-Ray Emission from the Spiral-Dominant Group of Galaxies HCG 57". Publications of the Astronomical Society of Japan. 54 (4): 527–532. arXiv:astro-ph/0207011. Bibcode:2002PASJ...54..527F. doi:10.1093/pasj/54.4.527.
"NAME COPELAND SEPTET". Retrieved 12 October 2018.
Bakich, Michael E. (July 10, 2010). 1,001 Celestial Wonders to See Before You Die: The Best Sky Objects for Star Gazers. Springer Science & Business Media. p. 72. ISBN 9781441917775. Retrieved 12 October 2018.
Jaffe, W.; Gavazzi, G. (1986-02-01). "Radio continuum survey of the coma/A1367 supercluster. II. 1.5 GHz observations of 396 CGCG galaxies". The Astronomical Journal. 91: 204–216. doi:10.1086/114001. ISSN 0004-6256.

Bayer	α (Regulus) β (Denebola) γ (Algieba) δ (Zosma) ε (Algenubi) ζ (Adhafera) η θ (Chertan) ι κ (Al Minliar al Asad) λ (Alterf) μ (Rasalas) ν ξ ο (Subra) π ρ σ τ υ φ χ ψ ω
Flamsteed	3 6 (h) 7 8 9 10 11 12 13 15 (f) 18 19 20 21 22 (g) 23 26 31 (A) 33 34 35 37 39 40 42 43 44 45 46 48 49 50 51 (m) 52 (k) 53 (l) 54 55 56 57 58 (d) 59 (c) 60 (b) 61 (p) 62 (p) 64 65 (p) 66 67 69 (p) 71 72 73 (n) 75 76 79 80 81 82 83 85 86 87 (e) 88 89 90 92 93 95 (o) 6 LMi 18 LMi 49 LMi 52 LMi
Variable	R AD CN CW DP EE
HR	4253 (p) 4459 (Formosa)
HD	81040 88133 89307 96063 (Dingolay) 97658 99109 (Shama) 100777 (Sagarmatha) 102272
Other	BD+20 2457 Gliese 408 Gliese 436 (Noquisi) GJ 3685 HVS 7 K2-3 K2-18 2MASSI J0937347+293142 2MASS J10475385+2124234 MACS J1149 Lensed Star 1 PSR B0943+10 PSR B0950+08 SDSS J102915+172927

Exoplanets	γ Leonis b μ Leonis b υ Leonis b DP Leonis b Gliese 436 b (Awohali) HD 81040 b HD 88133 b HD 89307 b HD 89345 b HD 96063 b (Ramajay) HD 99109 b (Perwana) HD 100777 b (Laligurans) HD 102272 b c K2-18b c

Messier	65 66 95 96 105
NGC	2903 2906 2911 2964 3041 3048 3049 3177 3185 3187 3190 3193 3226 3227 3239 3274 3301 3357 3362 3367 3370 3377 3384 3412 3426 3447 3455 3489 3501 3506 3521 3524 3535 3593 3596 3598 3599 3602 3605 3607 3608 3628 3632 3640 3646 3647 3664 3666 3678 3686 3697 3705 3710 3758 3799 3800 3801 3805 3806 3810 3816 3821 3837 3840 3841 3842 3844 3845 3851 3857 3859 3860 3861 3862 3864 3867 3868 3873 3875 3883 3884 3886 3900 3902 3908 3925 3937 3947 3954 4005
Numbered	I II III IV V
Other	Cosmic Horseshoe IC 2498 IC 2628 IRAS 10565+2448 J1000+1242 Leo P Leo T PSO J172.3556+18.7734 UGC 6614 UGC 6697