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Wargentin, Pehr; Bouteillec, Nathalie Le; Rohrbasser, Jean-Marc

doi:10.4000/books.ined.16793

Cited by 1 publication

(4 citation statements)

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“…Additionally, based on his best estimation that Ganymede is 1/25 of Jupiter's diameter, he inferred that the moon must be larger than Mercury. 47 Despite the method's limitations, his findings align perfectly with modern values.…”

Section: The Moons Of Jupitersupporting

confidence: 55%

“…The timing of the first through to the fourth contact does not reveal much -Wargentin and Klingenstierna recorded times that differed by just a few seconds. 33 However, there was one instance where the outcome was differed. About a minute before the second contact, Wargentin noted something peculiar.…”

Section: The Venus Transitsmentioning

confidence: 99%

“…Writing in the third person singular he explains that 'he saw clearly the whole curve' of the planet silhouetted on the solar disc, 'though with a fainter light on the outer side, which was last to enter'. 34 Wargentin hesitated but believed he saw hints of an atmosphere around Venus. 35 The procedure repeated itself during the emersion, when Wargentin, with Venus more than halfway through the emersion, still could trace a shining faint outline of the planet on the half that was outside the solar disc.…”

Section: The Venus Transitsmentioning

confidence: 99%

“…In addition, Wargentin more or less annually submitted his (and others) observations, particularly of Jupiter's moons, to international journals, such as Ephemerides Astronomicae ad Vindobonensem and Berliner Astronomische Jahrbuch. 85 His Jupiter tables, to a large part building on observations done with the refractor, were also widely disseminated and appeared in several international publications. 86 However, gauging impact by publication metrics is not readily applicable to a historical setting, as communication patterns were different.…”

Section: Notes On Contributormentioning

confidence: 99%

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‘Excellentissimo tubo Dollondiana’: The Stockholm Observatory’s 10-foot Dollond achromatic refractor

Kärnfelt

2024

Journal for the History of Astronomy

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The instrument collection at the Royal Swedish Academy of Sciences houses a historically significant 10-foot achromatic refractor crafted by London instrument maker John Dollond. The telescope came into use at the Academy’s Observatory in Stockholm in 1761 and remained in service into the 1820s. This paper aims to add to the biography of this instrument, encompassing its six decades of active service and, after 150 years in storage, its transformation into an exhibition showpiece. The paper begins by introducing the telescope, its maker and the conflict involving Dollond and the Swedish mathematician and physicist Samuel Klingenstierna over the discovery of the achromatic lens. This dispute ultimately resulted in the telescope finding its way to the Stockholm Observatory. Subsequently, the paper delves into how Academy astronomer Pehr Wargentin perceived and utilized this state-of-the-art refractor, along with brief mentions of its use by his successors. The final section narrates how the telescope ended up in the permanent exhibition of the Stockholm Observatory Museum.

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Section: The Moons Of Jupitersupporting

confidence: 55%

Section: The Venus Transitsmentioning

confidence: 99%

Section: The Venus Transitsmentioning

confidence: 99%

Section: Notes On Contributormentioning

confidence: 99%

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