the return to service of the hartrao 26m telescope michael gaylard hartrao
TRANSCRIPT
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The Return to Service of the HartRAO 26m Telescope
Michael GaylardHartRAO
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South polar shaft bearing failed 2008 October 03
Diagram of NASA antenna similar to HartRAO's
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A-frame to support telescope during bearing replacement
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HartRAO 26m telescope repair - pouring foundations for A-frame April 19
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Components at Tass Engineering, Johannesburg May 26
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Ludwig Combrinck measuring the polar shaft position May 27
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Placing the A-frame box-beam on the concrete bases June 10
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Preparing the A-frame legs June 18
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First A-frame leg hanging from collar around polar shaftJune 21
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Bracing the hour angle gear wheelJune 23
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Last A-frame leg installedJune 24
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Inserting the pin locking the A-frame leg to the box-beam June 24
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Welding A-frame base to box-beam June 29
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200-ton hydraulic jack lifts the telescope June 30
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Polar shaft end cap puller in place July 01
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Removing the polar shaft end capJuly 02
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Failed bearing exposed July 02
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Extracting fragments of shattered bearing July 02
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Arc-gouging to extract remains of bearing July 06
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Preparing polar shaft end cap for re-installation July 13
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The new bearing is in July 15
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Re-installing the polar shaft end cap July 15
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Removing the A-frame July 16
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The telescope drives West for the first time 2010 July 20
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Testing the limits July 22
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First light – testing the telescope pointingJuly 22
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First pulsar observation – Vela pulsar July 23
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First spectroscopy – water vapour in Orion July 23
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26m and 15m (XDM) – both observing the Vela pulsar July 23
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Vela pulsar glitches after 4 years – on July 31 at 21h 15m SASTdiscovered by 15m XDM then 26m
Sarah Buchner
See Astronomers Telegram 2768
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Interacting Binary star Circinus X-1radio flares
See Astronomers Telegram 2699
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First VLBI after repairICRF astrometry Aug 11
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First target of opportunity e-VLBI with the EVN, Sep 30
MAXI J1659-152Zsolt ParagiATEL 2906
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e-VLBI to Europeat 1024 Mbps – Nov 23
Target of Opportunity – Crab Pulsar
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e-VLBI to Australiaat 512 Mbps – Nov 24
Jonathan Quick
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26m Telescope Repair – Key Players and timeline
National Research Foundation – President Albert van Jaarsveld approves motivating the repair, 2009 July 22
Department of Science and Technology – Minister Naledi Pandor obtains funds for the repair
GD Satcom (US) – prime contractors - Tom McClellanStratosat Datacom (SA) – local contractors – Gerhard BothaTass Engineering (SA) – heavy engineeringHartRAO – Pieter Stronkhorst, Antennas and special projectsFirst post-repair observation – 2010 July 22First post-repair VLBI – 2010 August 11 - Jonathan Quick, VLBI Operations Manager