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Alvan Graham Clark was born in Fall River, Massachusetts, the son of Alvan Clark, founder of Alvan Clark & Sons. [1]On January 31, 1862, while testing a new 18.5-inch (470 mm) aperture great refractor telescope in Cambridgeport, Massachusetts, Clark made the first ever observation of a white dwarf star.
The metal-rich white dwarf WD 1145+017 is the first white dwarf observed with a disintegrating minor planet that transits the star. [ 176 ] [ 177 ] The disintegration of the planetesimal generates a debris cloud that passes in front of the star every 4.5 hours, causing a 5-minute-long fade in the star's optical brightness. [ 177 ]
Sirius is a binary star consisting of a main-sequence star of spectral type A0 or A1, termed Sirius A, and a faint white dwarf companion of spectral type DA2, termed Sirius B. The distance between the two varies between 8.2 and 31.5 astronomical units as they orbit every 50 years.
In 1979, Task Force Games published Star Fleet Battles, a tactical board wargame based on the original Star Trek television series and movies. In 1983, a new version of the game was released as the Commander's Edition. Concurrent with this, Task Force Games started to publish supplements called Commander's SSD Books. Each of these contained the ...
Star Date Data Comments Notes Refs Nearest Sirius 1852 8.6 ly (2.6 pc) Sirius B is also the second white dwarf discovered. [2] [3] Farthest SN UDS10Wil progenitor: 2013 10,000,000,000 ly z=1.914 SN Wilson is a type-Ia supernova whose progenitor was a white dwarf [10] [11] [12] Oldest WD 0346+246: 2021 11.5 billion years [13] Youngest
An artist's impression of Sirius A and Sirius B, a binary star system. Sirius A, an A-type main-sequence star, is the larger of the two. An A-type main-sequence star (A V) or A dwarf star is a main-sequence (hydrogen burning) star of spectral type A and luminosity class V (five). These stars have spectra defined by strong hydrogen Balmer ...
Iota Canis Majoris, lying between Sirius and Gamma, is another star that has been classified as a Beta Cephei variable, varying from magnitude 4.36 to 4.40 over a period of 1.92 hours. [36] It is a remote blue-white supergiant star of spectral type B3Ib, around 46,000 times as luminous as the sun and, at 2500 light-years distant, 300 times ...
Nearest white dwarf: Sirius B: 1852 8.6 light-years (2.6 pc) Sirius B is also the second white dwarf discovered, after 40 Eridani B. [9] [25] [26] Nearest brown dwarf: Luhman 16: 2013 6.5 light-years (2.0 pc) This is a pair of brown dwarfs in a binary system, with no other stars. [27] Nearest Luminous Blue Variable: P Cygni: 5,251 light-years ...