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NGC 3947
The barred spiral galaxy NGC 3947
Observation data (J2000 epoch)
Constellation	Leo
Right ascension	11 53 20.3285
Declination	+20° 45′ 06.049″
Redshift	0.020698
Heliocentric radial velocity	6205 ± 2 km/s
Distance	314.0 ± 22.0 Mly (96.28 ± 6.75 Mpc)
Group or cluster	NGC 3947 Group, Leo Cluster
Apparent magnitude (V)	13.2
Characteristics
Type	(R)SB(rs)b
Size	~153,100 ly (46.93 kpc) (estimated)
Apparent size (V)	1.4′ × 1.2′
Other designations
IRAS 11507+2101, 2MASX J11532031+2045055, UGC 6863, MCG +04-28-088, PGC 37264, CGCG 127-095

NGC 3947 is a barred spiral galaxy in the constellation of Leo. Its velocity with respect to the cosmic microwave background is 6528 ± 23 km/s, which corresponds to a Hubble distance of 314.0 ± 22.0 Mly (96.28 ± 6.75 Mpc). In addition, three non redshift measurements give a distance of 284.67 ± 12.90 Mly (87.28 ± 3.956 Mpc). It was discovered by German-British astronomer William Herschel on 26 April 1785.

Supernovae

Four supernovae have been observed in NGC 3947:

• SN 1972C (type unknown, mag. 16) was discovered by Charles Kowal on 18 January 1972.
• SN 2001P (type Ia, mag. 17.5) was discovered by LOTOSS (Lick Observatory and Tenagra Observatory Supernova Searches) on 31 January 2001.
• SN 2006aa (type IIn, mag. 18.1) was discovered by the Lick Observatory Supernova Survey (LOSS) on 8 February 2006.
• SN 2013G (type Ia, mag. 16) was discovered by the Catalina Sky Survey on 5 January 2013.

NGC 3842 Group

NGC 3947 is part of the 16 member NGC 3842 group, named after the brightest galaxy in the group. The other galaxy members are: NGC 3805, NGC 3837, NGC 3842, NGC 3860, NGC 3862, NGC 3883, NGC 3884, NGC 3919, NGC 3929, NGC 3937, NGC 3940, NGC 3954, UGC 6583, UGC 6697, and UGC 6725.

Like many of the neighboring galaxies, NGC 3947 and the galaxies in the NGC 3842 group are part of the Leo galaxy cluster (also known as Abell 1367).

See also

• List of NGC objects (3001–4000)

References

1. ^ "Results for object NGC 3947". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 22 August 2024.
2. "Distance Results for NGC 3947". NASA/IPAC EXTRAGALACTIC DATABASE. NASA. Retrieved 22 August 2024.
3. Seligman, Courtney. "NGC 3947". Celestial Atlas. Retrieved 22 August 2024.
4. "SN 1972C". Transient Name Server. IAU. Retrieved 22 August 2024.
5. Kowal, C. T.; Zwicky, F.; Sargent, W. L. W.; Searle, L. (1973). "The 1972 Palomar Supernova Search". Publications of the Astronomical Society of the Pacific. 85 (506): 427. Bibcode:1973PASP...85..427K. doi:10.1086/129482.
6. Li, W. D. (2001). "Supernova 2001P in NGC 3947". International Astronomical Union Circular (7576): 1. Bibcode:2001IAUC.7576....1L.
7. "SN 2001P". Transient Name Server. IAU. Retrieved 22 August 2024.
8. Lee, E.; Baek, M.; Li, W. (2006). "Supernovae 2006aa, 2006ab, and 2006ac". International Astronomical Union Circular (8669): 1. Bibcode:2006IAUC.8669....1L.
9. "SN 2006aa". Transient Name Server. IAU. Retrieved 22 August 2024.
10. Howerton, S.; Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan, M.; McNaught, R. H.; Christensen, E.; Larson, S. M.; Rosi, P.; Tinjaca Ramirez, L. M.; Marion, G. H.; Challis, P.; Berlind, P. (2013). "Supernova 2013G in NGC 3947 = PSN J11532132+2044100". Central Bureau Electronic Telegrams. 3381: 1. Bibcode:2013CBET.3381....1H.
11. "SN 2013G". Transient Name Server. IAU. Retrieved 22 August 2024.
12. Mahtessian, A. P. (1998). "Groups of galaxies. III. Some empirical characteristics" (PDF). Astrophysics. 41 (3): 308–321. Bibcode:1998Ap.....41..308M. doi:10.1007/BF03036100.

External links

• Media related to NGC 3947 at Wikimedia Commons
• NGC 3947 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

v t e Constellation of Leo
List of stars in Leo Leo in Chinese astronomy
Stars	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
Galaxies	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
Astronomical events SN 1988Z
Category

• NGC objects
• Principal Galaxies Catalogue objects
• MCG objects
• UGC objects
• IRAS catalogue objects
• Leo (constellation)
• Astronomical objects discovered in 1785
• Discoveries by William Herschel
• Barred spiral galaxies
• Leo Cluster