NGC 3947 explained

NGC3947
Constellation Name:	Leo
Epoch:	J2000
Type:	(R)SB(rs)b^[1]
Dist Ly:	NaNMpc
Group Cluster:	NGC 3947 Group, Leo Cluster
Z:	0.020698
H Radial V:	6205 ± 2 km/s
Appmag V:	13.2
Size V:	1.4' x 1.2'
Size:	~46.93kpc (estimated)

NGC3947 is a barred spiral galaxy in the constellation of Leo. Its velocity with respect to the cosmic microwave background is 6528 ± 23km/s, which corresponds to a Hubble distance of NaNMpc. In addition, three non redshift measurements give a distance of NaNabbr=onNaNabbr=on.^[2] It was discovered by German-British astronomer William Herschel on 26 April 1785.^[3]

Supernovae

Four supernovae have been observed in NGC3947:

• SN1972C (type unknown, mag.16)^[4] was discovered by Charles Kowal on 18 January 1972.^[5]
• SN2001P (typeIa, mag.17.5) was discovered by LOTOSS (Lick Observatory and Tenagra Observatory Supernova Searches) on 31 January 2001.^{[6] [7]}
• SN2006aa (typeIIn, mag.18.1) was discovered by the Lick Observatory Supernova Survey (LOSS) on 8 February 2006.^{[8] [9]}
• SN2013G (typeIa, mag.16) was discovered by the Catalina Sky Survey on 5 January 2013.^{[10] [11]}

NGC 3842 Group

NGC 3947 is part of the 16 member NGC3842 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.^[12]

Like many of the neighboring galaxies, NGC3947 and the galaxies in the NGC3842 group are part of the Leo galaxy cluster (also known as Abell1367).

See also

• List of NGC objects (3001–4000)

Notes and References

1. Web site: NASA/IPAC Extragalactic Database . Results for NGC 3947 . 22 August 2024.
2. Web site: Distance Results for NGC3947. NASA/IPAC EXTRAGALACTIC DATABASE . . 22 August 2024.
3. Web site: NGC3947 . Seligman . Courtney . Celestial Atlas . 22 August 2024 .
4. Web site: Transient Name Server . SN1972C . . 22 August 2024.
5. 10.1086/129482 . free . The 1972 Palomar Supernova Search . 1973 . Kowal . C. T. . Zwicky . F. . Sargent . W. L. W. . Searle . L. . Publications of the Astronomical Society of the Pacific . 85 . 506 . 427 . 1973PASP...85..427K .
6. 2001IAUC.7576....1L. Supernova 2001P in NGC 3947. Li. W. D.. International Astronomical Union Circular. 2001. 7576. 1.
7. Web site: Transient Name Server . SN2001P . . 22 August 2024.
8. 2006IAUC.8669....1L. Supernovae 2006aa, 2006ab, and 2006ac. Lee. E.. Baek. M.. Li. W.. International Astronomical Union Circular. 2006. 8669. 1.
9. Web site: Transient Name Server . SN2006aa . . 22 August 2024.
10. 2013CBET.3381....1H. Supernova 2013G in NGC 3947 = PSN J11532132+2044100. 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.. Central Bureau Electronic Telegrams. 2013. 3381. 1.
11. Web site: Transient Name Server . SN2013G . . 22 August 2024.
12. 10.1007/BF03036100. Groups of galaxies. III. Some empirical characteristics. 1998. Mahtessian. A. P.. Astrophysics. 41. 3. 308–321. 1998Ap.....41..308M .