A1689-zD1

{{Short description|Galaxy in the constellation Virgo}}

{{Distinguish|Abell 1689}}

{{Infobox galaxy

| name = A1689-zD1

| image = A1689-zD1.jpg

| caption = Location of A1689-zD1 in infrared and visible light by Hubble Space Telescope and Spitzer Space Telescope

| credit =

| epoch = J2000

| pronounce =

| constellation name = Virgo

| ra = {{RA|13|11|29.9}}

| dec = {{DEC|-01|19|19}}

| z = 7.6

| h_radial_v = 2,278,423 km/s

| gal_v = 2,278,351 +/- 3 km/s

| dist_ly = 13 billion light-years
(light travel distance)
30 billion light-years
(present proper distance)

| group_cluster = Abell 1689

| type = Dwarf

| mass = {{Val|1.7|e=9}}

| stars =

| appmag_v = 25.3

| size = ~3,000 ly (diameter)

| size_v = 0.0008 x 0.0008

| notes =

| names = BBF2008 A1689-zD1

| references =

}}

A1689-zD1 is a galaxy in the Virgo constellation. It was a candidate for the most distant and therefore earliest-observed galaxy discovered {{as of|2008|February|lc=y}}, based on a photometric redshift.{{cite web

| title = Astronomers Eye Ultra-Young, Bright Galaxy in Early Universe

| publisher = NASA

| date = 2008-02-12

| url = http://www.nasa.gov/centers/jpl/news/Spitzer20080212.html

| access-date = 2008-02-25

| archive-date = 2016-03-18

| archive-url = https://web.archive.org/web/20160318184254/http://www.nasa.gov/centers/jpl/news/Spitzer20080212.html

| url-status = dead

}}{{cite web

| title = Astronomers Uncover One of the Youngest and Brightest Galaxies in the Early Universe

| publisher = Space Telescope Science Institute Baltimore, Md. / nasa.gov

| date = 2008-02-12

| url = http://www.nasa.gov/mission_pages/hubble/science/young_bright.html

| access-date = 2008-02-25 | archive-url= https://web.archive.org/web/20080217204728/http://www.nasa.gov/mission_pages/hubble/science/young_bright.html| archive-date= 17 February 2008 | url-status=live}}

If the redshift, z~7.6,{{cite web|title= heic0805: Hubble finds strong contender for galaxy distance record

|publisher= ESA/Hubble

|date= 2008-02-12

|url= http://www.spacetelescope.org/news/html/heic0805.html

|access-date= 2008-04-04

| archive-url= https://web.archive.org/web/20080308003313/http://www.spacetelescope.org/news/html/heic0805.html| archive-date= 8 March 2008 | url-status=live}} 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.