![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/6/60/BX442_color_cutout_hst_mos_0080629_wfc3_ir_f110w_f160w_f160w_sci.jpg/640px-BX442_color_cutout_hst_mos_0080629_wfc3_ir_f110w_f160w_f160w_sci.jpg&w=640&q=50)
BX442
Distant grand design spiral galaxy in the constellation Pegasus / From Wikipedia, the free encyclopedia
Dear Wikiwand AI, let's keep it short by simply answering these key questions:
Can you list the top facts and stats about BX442?
Summarize this article for a 10 year old
BX442 (Q2343-BX442[1]) is a grand design spiral galaxy of type Sc.[1] It has a companion dwarf galaxy. It is the most distant known grand design spiral galaxy in the universe, with a redshift of z=2.1765 ± 0.0001.[1] It is commonly referred to as the oldest known grand design spiral galaxy in the universe,[2] but it is more accurately the earliest such galaxy known to exist in the universe, 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[3]) of 10.7 billion years[1] in the concordance cosmology. This time estimate means that structure seen in BX442 developed roughly 3 billion years after the Big Bang. It is 15 kiloparsecs (50 kly) in diameter, and has a mass of 6 × 1010 solar masses.
Q2343-BX442 | |
---|---|
![]() BX442 (Hubble Legacy Archive) | |
Observation data (J2000[1] epoch) | |
Constellation | Pegasus |
Right ascension | 23h 46m 19.35s[1] |
Declination | +12° 48′ 00.0″[1] |
Redshift | 2.1765±0.0001[1] |
Heliocentric radial velocity | 652348±0.0001 km/s[citation needed] |
Galactocentric velocity | 652498±6 km/s[citation needed] |
Distance | 10.7 billion ly (3.3 billion pc) (light travel distance) 18 billion ly (5.5 billion pc) (present proper distance) |
Apparent magnitude (V) | 24.4R |
Characteristics | |
Type | Sc[1] |
Size | ~50 kly (diameter) |
Apparent size (V) | 0.015 x 0.01 moa |
Other designations | |
HB89 2343+125 BX442, PGC 4668406, SSTSL2 J234619.33+124759.4 |