UDF 423

Last updated
UDF 423
UDF423-SpiralGalaxy.jpg
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
Type Sab
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]

Contents

Distance measurements

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]

See also

References

  1. 1 2 3 4 5 6 "UDF 423". Wikisky . Retrieved 2010-11-03.
  2. 1 2 Sangeeta Malhotra. "As far as the Hubble can see" (PDF). Arizona State University . Retrieved 2010-10-28.
  3. 1 2 3 4 5 Edward L. (Ned) Wright. "Cosmology Calculator I". Astronomy @ UCLA. Retrieved 2010-10-22.


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