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pt5m – a 0.5 m robotic telescope on La Palma

Hardy, L.H.; Butterley, T.; Dhillon, V.S.; Littlefair, S.P.; Wilson, R.W.

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L.H. Hardy

T. Butterley

V.S. Dhillon

S.P. Littlefair


pt5m is a 0.5 m robotic telescope located on the roof of the 4.2 m William Herschel Telescope (WHT) building, at the Roque de los Muchachos Observatory, La Palma. Using a five-position filter wheel and CCD detector, and bespoke control software, pt5m provides a high-quality robotic observing facility. The telescope first began robotic observing in 2012, and is now contributing to transient follow-up and time-resolved astronomical studies. In this paper, we present the scientific motivation behind pt5m, as well as the specifications and unique features of the facility. We also present an example of the science we have performed with pt5m, where we measure the radius of the transiting exoplanet WASP-33b. We find a planetary radius of 1.603 ± 0.014RJ.


Hardy, L., Butterley, T., Dhillon, V., Littlefair, S., & Wilson, R. (2015). pt5m – a 0.5 m robotic telescope on La Palma. Monthly Notices of the Royal Astronomical Society, 454(4), 4316-4325.

Journal Article Type Article
Acceptance Date Sep 29, 2015
Online Publication Date Oct 28, 2015
Publication Date Dec 21, 2015
Deposit Date Mar 29, 2016
Publicly Available Date Apr 7, 2016
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 454
Issue 4
Pages 4316-4325


Published Journal Article (1.5 Mb)

Copyright Statement
This article has been published in Monthly Notices of the Royal Astronomical Society ©: 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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