A1689B11

A1689B11 is an extremely old spiral galaxy located in the Abell 1689 galaxy cluster in the Virgo constellation about 11 billion light years from Earth.^[2] The disk of A1689B11 is cool and thin, yet it produced stars at thirty times the rate of the Milky Way. With a lookback time (the difference between the age of the universe now and the age of the universe at the time light left the galaxy) of 11 billion years in the concordance cosmology, A1689B11 is forming 2.6 billion years after the Big Bang. And its present comoving distance is about 19.4 billion light-years from the Earth. It is one of the most distant known spiral galaxies as of 2017^[update].^[3][1]

A1689B11
Observation data (J2000 epoch)
Constellation	Virgo
Right ascension	13h 11m 33.336s[1]
Declination	−01° 21′ 06.9″[1]
Redshift	2.540[1]
Heliocentric radial velocity	761,473 km/s (473,157 mi/s)
Galactocentric velocity	761,400 km/s (473,100 mi/s)
Distance	11 billion ly (3.4 billion pc) (light travel distance) 19.4 billion ly (5.9 billion pc) (comoving distance)
Apparent magnitude (V)	24
Characteristics
Type	S[1]
Mass	1010.2 (dynamical)[1] 109.8 ± 0.3 (stellar)[1] M☉
Apparent size (V)	5200 pc (17 kly)
Half-light radius (physical)	2600 ± 700 pc[1]
Other designations
BBC2005 11.1, [BBC2005] Source 11

See also

• BX442, another old and distant spiral galaxy
• BRI 1335-0417, another old and distant spiral galaxy