UDF 423
Spiral galaxy UDF 423 in the Hubble Ultra Deep Field
Observation data ( J2000 epoch)
Constellation	Fornax
Right ascension	03h 32m 39.16s [1]
Declination	−27° 48′ 44.7″ [1]
Redshift	1 (or 0.46) [2]
Distance	7.7 billion light-years (or 4.7 billion light-years) ( light travel distance) [3] ~10 billion light-years (or 5.7 billion light-years) (present comoving distance) [3]
Apparent magnitude (V)	20 [1]
Characteristics
Apparent size (V)	0.11' x 5.04" [1] or 0.0027' x 0.0027'

UDF 423 is the Hubble Ultra Deep Field (UDF) identifier for a distant spiral galaxy. With an apparent magnitude of 20, ^[1] UDF 423 is one of the brightest galaxies in the HUDF and also has one of the largest apparent sizes in the HUDF. ^[1]

The "distance" of a far away galaxy depends on how it is measured. With a redshift of 1, ^[2] light from this galaxy is estimated to have taken around 7.7 billion years to reach Earth. ^[3] However, since this galaxy is receding from Earth, the present comoving distance is estimated to be around 10 billion light-years away. ^[3] In context, Hubble is observing this galaxy as it appeared when the Universe was around 4.9 billion years old. ^[3]

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