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White dwarf - Wikipedia
An exoplanet orbits PSR B1620-26 and its white dwarf companion (see below) in a circumbinary orbit. HD 49798: 1,600 White dwarf: One of the smallest white dwarf stars known. [15] ZTF J1901+1458: 1,809 Currently the most massive white dwarf known. [16] Janus: 3,400 A white dwarf with a side of hydrogen and another side of helium. [17] Wolf 1130 ...
G 240-72 has mass 0.81 Solar masses [2] and surface gravity 10 8.36 (2.29 · 10 8) cm·s −2, [2] or approximately 234 000 of Earth's, corresponding to a radius 6850 km, or 107% of Earth's. This white dwarf has relatively low temperature 5590 K [2] (slightly cooler than the Sun), and old cooling age, i. e. age as degenerate star (not counting ...
A K-type main-sequence star, also referred to as a K-type dwarf, or orange dwarf, is a main-sequence (hydrogen-burning) star of spectral type K and luminosity class V. These stars are intermediate in size between red M-type main-sequence stars ("red dwarfs") and yellow/white G-type main-sequence stars.
A light year is the distance light travels in a year, 5.9 trillion miles (9.5 trillion km). Janus is fairly massive for a white dwarf, with a mass 20% larger than that of our sun compressed into ...
First white dwarf with a planet WD B1620−26: 2003 PSR B1620-26 b (planet) This planet is a circumbinary planet, which circles both stars in the PSR B1620-26 system [5] [6] First singular white dwarf with a planet WD 1145+017: 2015 WD 1145+017 b: Planet is extremely small and is disintegrating. First white dwarf that is a pulsar: AR Scorpii A ...
Vesta is a rocky object in our solar system's main asteroid belt with a diameter of about 330 miles (530 km). ... This white dwarf started its life as a star about twice the sun's mass, living a ...
This measurement marked the first direct gravitational mass determination of a single white dwarf. [6] Gliese 440 has only 56% of the Sun's mass, [6] but it is the remnant of a massive main-sequence star that had an estimated 4.4 solar masses. [22] While it was on the main sequence, it probably was a spectral class B star (in the range B4–B9 ...