File:Clyde Tombaugh Records - Flickr - brewbooks.jpg
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[edit]DescriptionClyde Tombaugh Records - Flickr - brewbooks.jpg |
Percival Lowell's hope in tracking down Planet X was to establish his scientific credibility, which had eluded him thanks to his widely derided belief that channel-like features visible on the surface of Mars were canals constructed by an intelligent civilisation. In 1915, he published his Memoir of a Trans-Neptunian Planet, in which he concluded that Planet X had a mass roughly seven times that of the Earth—about half that of Neptune—and a mean distance from the Sun of 43 AU. He assumed Planet X would be a large, low-density object with a high albedo, like the gas giants. Lowell's sudden death in 1916 temporarily halted the search for Planet X. Failing to find the planet, according to one friend, "virtually killed him". In 1929 the observatory's director, Vesto Melvin Slipher, summarily handed the job of locating the planet to Clyde Tombaugh, a 22-year-old Kansas farm boy who had only just arrived at the Lowell Observatory after Slipher had been impressed by a sample of his astronomical drawings Tombaugh's task was to systematically capture sections of the night sky in pairs of images. Each image in a pair was taken two weeks apart. He then placed both images of each section in a machine called a blink comparator, which by exchanging images quickly created a time lapse illusion of the movement of any planetary body. By the beginning of 1930, Tombaugh's search had reached the constellation of Gemini. On 18 February 1930, after searching for nearly a year and examining nearly 2 million stars, Tombaugh discovered a moving object on photographic plates taken on 23 January and 29 January of that year. See en.wikipedia.org/wiki/Planets_beyond_Neptune and en.wikipedia.org/wiki/Clyde_Tombaugh Lowell Observatory Flagstaff, Arizona sw2 325 |
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Source | Clyde Tombaugh Records |
Author | brewbooks from near Seattle, USA |
Camera location | 35° 12′ 10.41″ N, 111° 39′ 53.02″ W ![]() | View this and other nearby images on: OpenStreetMap | ![]() |
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This image was originally posted to Flickr by brewbooks at https://flickr.com/photos/93452909@N00/5872757725. It was reviewed on 5 November 2016 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-sa-2.0. |
5 November 2016
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current | 17:03, 5 November 2016 | ![]() | 3,264 × 2,448 (3.93 MB) | Josve05a (talk | contribs) | == {{int:filedesc}} == {{Information |Description=Percival Lowell's hope in tracking down Planet X was to establish his scientific credibility, which had eluded him thanks to his widely derided belief that channel-like features visible on the surface o... |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot SD850 IS |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/2.8 |
ISO speed rating | 500 |
Date and time of data generation | 11:58, 19 May 2011 |
Lens focal length | 5.8 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
File change date and time | 11:58, 19 May 2011 |
Y and C positioning | Centered |
Exif version | 2.2 |
Date and time of digitizing | 11:58, 19 May 2011 |
Meaning of each component |
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Image compression mode | 5 |
APEX shutter speed | 5.90625 |
APEX aperture | 2.96875 |
APEX exposure bias | 0 |
Maximum land aperture | 2.96875 APEX (f/2.8) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 14,506.666666667 |
Focal plane Y resolution | 14,485.207100592 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
Keywords | sw2 |