#isaac roberts

[lindahall]

Isaac Roberts – Scientist of the Day

Isaac Roberts, a Welsh engineer, manufacturer, and amateur astronomer, was born Jan. 27, 1829.

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[dame-de-pique]

Isaac Roberts - Nebulae in Orion, Exposure 1h 7m, enlarged 5 times, 30th November 1882

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[thelostvintage]

Photograph of star-field centred on the star Gamma Cassiopeia taken on 17 January 1890 with an exposure of 90 minutes. Dr Isaac Roberts, an amateur astronomer and pioneer astrophotography, took this image using a 20 inch aperture reflecting telescope. Made by Howard Grubb of Dublin, the telescope was first installed at his home near Liverpool, but later in 1890 he moved it to the less smoky skies of Crowborough, Sussex. In 1887, Roberts was invited to attend the first international conference in Paris on celestial photography. Here astronomers decided to embark on the, 'Carte du Ciel' an ambitious project to photograph the whole sky in unprecedented detail.

[dame-de-pique]

Isaac Roberts - Nebula in the Pleiades, 8.12.1888

Position of centre R. A.: 3h 40m. Decl: + 23° 46'. Instrument: Reflector. Place: Crowborough, Sussex. Aperture: 20 in. Focal length: 98 in. Exposure: 4 hours

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[dame-de-pique]

Isaac Roberts - Great nebula in Orion, 24.12.1888

Position of centre R. A.: 5h 30m. Decl: - 5° 27'. Instrument: Reflector. Place: Crowborough, Sussex. Aperture: 20 in. Focal length: 98 in. Exposure: 80 min.

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[dame-de-pique]

Isaac Roberts - Nebula in Andromeda, 29.12.1888

Position of centre R. A.: 0h 36m. Decl: + 40° 30'. Instrument: Reflector. Place: Crowborough, Sussex. Aperture: 20 in. Focal length: 98 in. Exposure: 4 hour

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[lindahall]

Dorothea Klumpke Roberts – Scientist of the Day

Dorothea Klumpke Roberts (second image) was the first woman to earn an advanced degree in astronomy—a feat she accomplished in 1893, at the University of Paris, with a dissertation about the rings of Saturn.

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[greuzbilder]

Alpha Tauri, Isaac Roberts,  20th of December, 1886.