NGC 5784 explained

NGC 5784
Constellation Name:	Boötes
Epoch:	J2000
Type:	S0^[1]
Dist Ly:	NaNMpc
Z:	0.017912
H Radial V:	5370 ± 16 km/s
Appmag V:	12.4
Size V:	1.9' x 1.8'
Size:	~45.82kpc (estimated)

NGC 5784 is a lenticular galaxy in the constellation of Boötes. Its velocity with respect to the cosmic microwave background is 5493 ± 18 km/s, which corresponds to a Hubble distance of 81.01 ± 5.68 Mpc (∼264 million light-years). It was discovered by German-British astronomer William Herschel on 9 April 1787.^[2]

Two supernovae have been observed in NGC 5784: SN 2018mef (type Ia, mag. 17.5),^[3] and SN 2023bch (type Ia, mag. 15.4),^[4]

NGC 5739 Group

According to Abraham Mahtessian, NGC 5784 is part of the seven member NGC 5739 group (also known as [M98j] 234). The other six galaxies are: NGC 5598, NGC 5603, NGC 5696, NGC 5739, NGC 5787, and NGC 5860.^[5]

See also

• List of NGC objects (5001–6000)

Notes and References

1. Web site: NASA/IPAC Extragalactic Database . Results for NGC 5784 . 8 August 2024.
2. https://cseligman.com/text/atlas/ngc57a.htm#5784 Celestial Atlas entry for NGC 5784.
3. https://www.wis-tns.org/object/2018mef Transient Name Server entry for SN 2018mef.
4. https://www.wis-tns.org/object/2023bch Transient Name Server entry for SN 2023bch.
5. https://www.researchgate.net/publication/236586937_Groups_of_galaxies_III_Some_empirical_characteristics Groups of galaxies. III. Some empirical characteristics. By Abraham Mahtessian, Byurakan Astrophysical Observatory. Astrophysics, Vol. 41. No. 3, July, 1998.