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Weather conditions at Timau National Observatory from ERA5

Published online by Cambridge University Press:  23 September 2024

Rhorom Priyatikanto Open the ORCID record for Rhorom Priyatikanto [Opens in a new window] ,
Agustinus Gunawan Admiranto ,
Thomas Djamaluddin ,
Abdul Rachman  and
Dudy Wijaya
Rhorom Priyatikanto*
Affiliation:
Research Centre for Space, National Research and Innovation Agency, Bandung, Indonesia School of Geography and Environmental Science, University of Southampton, Southampton, UK
Agustinus Gunawan Admiranto
Affiliation:
Research Centre for Space, National Research and Innovation Agency, Bandung, Indonesia
Thomas Djamaluddin
Affiliation:
Research Centre for Space, National Research and Innovation Agency, Bandung, Indonesia
Abdul Rachman
Affiliation:
Research Centre for Space, National Research and Innovation Agency, Bandung, Indonesia Timau National Observatory, National Research and Innovation Agency, Bandung, Indonesia
Dudy Wijaya
Affiliation:
Faculty of Earth Sciences and Technology, Institut Teknologi Bandung, Bandung, Indonesia
*
Corresponding author: Rhorom Priyatikanto; Email: [email protected].
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Abstract

A new observatory site should be investigated for its local climate conditions to see its potential and limitations. In this respect, we examine several meteorological parameters at the site of Timau National Observatory, Indonesia using the ERA5 dataset from 2002 to 2021. Based on this dataset, we conclude that the surface temperature at Timau is around $18.9^{\circ}$C with relatively small temperature variation ($\sim$$1.5^{\circ}$C) over the day. This temperature stability is expected to give advantages to the observatory. In terms of humidity and water vapour, Timau is poor for infrared observations as the median precipitable water vapour exceeds 18 mm, even during the dry season. However, near-infrared observations are feasible. Even though our cloud cover analysis confirms the span of the observing season in the region, we find a significant discrepancy between the clear sky fraction derived from the ERA5 dataset and the one estimated using satellite imagery. Aside from the indicated bias, our results provide insights and directions for the operation and future development of the observatory.

Keywords

Observatories (1147)Astronomical site protection (94)
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 41 , 2024 , e058
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of Astronomical Society of Australia

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Footnotes

*

Joint first authors

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