TON 618

TON 618
TON 618
	[[File:\|1089px\|alt=]] TON 618, imaged by the Sloan Digital Sky Survey Data Release 9 (DR9). The quasar appears as the bright, bluish-white dot at the center.
Observation data (Epoch J2000.0)
Constellation	Canes Venatici
Right ascension	12h 28m 24.9s
Declination	+31° 28′ 38″
Redshift	2.219
Distance	3.31 Gpc (10.8 Gly); (light travel distance); 5.59 Gpc (18.2 Gly); (comoving distance, present proper distance); ;
Type	Quasar
Apparent magnitude (V)	15.9
Notable features	Hyperluminous quasar in a Lyman-alpha blob
Other designations
	FBQS J122824.9+312837, B2 1225+31, QSO 1228+3128, 7C 1225+3145, CSO 140, 2E 2728, Gaia DR1 4015522739308729728
	See also: Quasar, List of quasars

TON 618 (abbreviation of Tonantzintla 618) is a hyperluminous, broad-absorption-line, radio-loud quasar, and Lyman-alpha blob located near the border of the constellations Canes Venatici and Coma Berenices, with the projected comoving distance of approximately 18.2 billion light-years from Earth. It possesses one of the most massive black holes ever found, at roughly 40 billion M_☉.