Van Maanen 2 [SEP] constellation
"A" is the mean atomic weight of the nuclei in the star.
In 2016, it was discovered that a spectrographic plate of van Maanen 2 made in 1917 has evidence – the earliest known – of planetary matter outside the Solar System. No actual planet has been detected, but the plate reveals the existence of a circumstellar ring of debris, and such rings in other cases have been associated with planets.
Characteristics.
Van Maanen 2 is located from the Sun in the constellation Pisces, about 2°
Van Maanen 2
Van Maanen 2 (van Maanen's Star ) is a white dwarf. It is a dense, compact stellar remnant that is no longer generating energy, having about 68% of the Sun's mass but only 1% of the Sun's radius. At a distance of 13.9 light-years, it is the closest known solitary white dwarf and the third closest white dwarf to the Sun, after Sirius B and Procyon B, in that order. Discovered in 1917 by Dutch–American astronomer Adriaan van