|Right ascension||13h 11m 29.9s|
|Declination||−01° 19′ 19″|
13 billion light-years|
(light travel distance)
|Group or cluster||Abell 1689|
|Apparent magnitude (V)||25.3|
|Size||~10,000 ly (diameter)|
A1689-zD1 is a galaxy in the Virgo constellation cluster. It was a candidate for the most distant and therefore earliest observed galaxy discovered as of February 2008[update], based on a photometric redshift.
If the redshift, z~7.6, is correct, it would explain why the galaxy's faint light reaches us at infrared wavelengths. It could only be observed with Hubble Space Telescope's Near Infrared Camera and Multi-Object Spectrometer (NICMOS) and the Spitzer Space Telescope's Infrared Array Camera exploiting the natural phenomenon of gravitational lensing: the galaxy cluster Abell 1689, which lies between Earth and A1689-zD1, at a distance of 2.2 billion light-years from us, functions as a natural "magnifying glass" for the light from the far more distant galaxy which lies directly behind it, at 700 million years after the Big Bang, as seen from Earth.
- "Astronomers Eye Ultra-Young, Bright Galaxy in Early Universe". nasa.gov. 2008-02-12. Retrieved 2008-02-25.
- "Astronomers Uncover One of the Youngest and Brightest Galaxies in the Early Universe". Space Telescope Science Institute Baltimore, Md. / nasa.gov. 2008-02-12. Archived from the original on 17 February 2008. Retrieved 2008-02-25.
- "heic0805: Hubble finds strong contender for galaxy distance record". ESA/Hubble. 2008-02-12. Archived from the original on 8 March 2008. Retrieved 2008-04-04.
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