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SDSS J091709.55+463821.8

SDSS J091709.55+463821.8, or J0917+46 in short, is a double of an enormous bloated white dwarf (A) and an invisible companion (B). Star B probably is another white dwarf, which has sucked up the other one. Star A is the white dwarf with the smallest known mass (1/3 of normal), but the largest known diameter (9 * normal).

Constellation: Lynx
Distance: 7400 light-years
Space between J0917+46 A and B: 0.007 AU
Orbit period of J0917+46 A and B: 7.6 days

J0917+46 A

Mass: 0.17 * Sun
Diameter: 0.08 * Sun (9 * Earth)

J0917+46 B

Mass: > 0.28 * Sun

Back: List of Special Stars part 2


    SDSS J091709.55+463821.8
Graphic: David A. Aguilar (CfA)

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