UDF 423
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]
| 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 spiral galaxy in the lower right quadrant of the Hubble Ultra Deep Field.
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 5.9 billion years old.[3]
gollark: We may need two bots to trap it in a loop.
gollark: ```pythonbot = commands.Bot(command_prefix='++', description="AutoBotRobot, the most useless bot on the planet.", case_insensitive=True)@bot.eventasync def on_message(message): print(message.content) await bot.process_commands(message)```is the particularly relevant bit.
gollark: It is not.
gollark: ++exec```python3q = "``" + "`"print(f"++exec\n{q}python3\nprint('hi')\n{q}")```
gollark: Hmm, didn't respond to itself.
See also
- List of Deep Fields
References
- "UDF 423". Wikisky. Retrieved 2010-11-03.
- Sangeeta Malhotra. "As far as the Hubble can see" (PDF). Arizona State University. Retrieved 2010-10-28.
- Edward L. (Ned) Wright. "Cosmology Calculator I". Astronomy @ UCLA. Retrieved 2010-10-22.
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