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The Royal Society: Science in the Making

Unpublished paper, 'Star photography - the effects of long and short exposures on star magnitudes' by Isaac Roberts

Reference number: AP/64/5

Date: 1886

Description

Roberts notices differences between the duplicate photographic plates in his star chart for the Northern Hemisphere, for which he suggests three possible causes: the duration of exposure; the varying sensitivity of the film; and the hygrometric states of the atmosphere. In this paper he focuses on the differences caused by various exposures.

Annotations in pencil and ink throughout. With two photographs titled 'Star Photography: Polaris and Trapezium Orion'.

Subject: Astronomy / Photography

Received 21 May 1886.

Reference number
AP/64/5
Earliest possible date
1886
Physical description
Ink and graphite pencil on paper
Page extent
18 pages
Format
Manuscript
Photograph

Creator name

Isaac Roberts

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Citation

Isaac Roberts, Unpublished paper, 'Star photography - the effects of long and short exposures on star magnitudes' by Isaac Roberts, 1886, AP/64/5, The Royal Society Archives, London, https://makingscience.royalsociety.org/items/ap_64_5/unpublished-paper-star-photography-the-effects-of-long-and-short-exposures-on-star-magnitudes-by-isaac-roberts, accessed on 21 April 2025

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https://makingscience.royalsociety.org/items/ap_64_5/unpublished-paper-star-photography-the-effects-of-long-and-short-exposures-on-star-magnitudes-by-isaac-roberts

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    The 'Archived Papers' collection is comprised of original manuscript scientific papers and letters submitted to the Royal Society which remained unpublished or were abstracted in the journal 'Proceedings of the Royal Society' published from 1830 onwards.

    Dates: 1768 - 1989

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