UDF 423
Appearance
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' |
![](http://upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Hubble_ultra_deep_field_high_rez_edit1.jpg/220px-Hubble_ultra_deep_field_high_rez_edit1.jpg)
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]
Distance measurements
[edit]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
[edit]References
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