Half-Mile Telescope
Template:Use dmy dates {{#invoke:Infobox|infobox}}Template:Template other{{#invoke:Check for unknown parameters|check|unknown=Template:Main other|preview=Page using Template:Infobox telescope with unknown parameter "_VALUE_"|ignoreblank=y| alt | altitude | angular_resolution | area | built | caption | child | code | commons | coordinates | coords | decommissioned | diameter | diameter2 | diameter3 | discovered | dome | embedded | first_light | focal_length | illuminatedarea | illuminateddiameter | image | image_scale | length | location | locmapin | logo | map_caption | module | mounting | name | nomap | nrhp | namedafter | onlysourced | observatory | organisation | organization | qid | refs | style | suppressfields | wavelength | website | width}}Template:Main other The Half-Mile Telescope was constructed in 1968 (2 aerials) at the Mullard Radio Astronomy Observatory with two more aerials being added in 1972, using donated dishes (total cost was £70,000). Two of the dishes are fixed, while two are moveable and share the One-Mile's rail track; to obtain information from the maximum number of different baselines, 30 days of observing were required. Observing frequency 1.4 GHz (21 cm wavelength), bandwidth 4 MHz. Used for Hydrogen Line studies of nearby galaxies and produced the first good radio maps of hydrogen distribution (as a function of its velocity), for M33 and M31 (also produced nearly 20 PhDs and 50 published papers). The telescope was operated by the Radio Astronomy Group of the Cambridge University.
