VB 10 or Van Biesbroeck's star /vænˈbiːzbrʊk/[7] is a small and dim red dwarf[2] located in the constellation Aquila.

[8] Although it is relatively close to Earth, at about 19 light years, VB 10 is a dim magnitude 17, making it difficult to image with amateur telescopes as it can get lost in the glare of the primary star.

VB 10 was discovered in 1944 by the astronomer George van Biesbroeck using the 82 in (2.1 m) Otto Struve reflector telescope at the McDonald Observatory.

Although VB 10 has a normal low surface temperature of 2600 K it was found to produce violent flares of up to 100,000 K.[11] This came as a surprise to astronomers.

It had previously been assumed that low mass red dwarfs would have insignificant or nonexistent magnetic fields, which are necessary for the production of solar flares.

Nevertheless, the detection of solar flares indicates some as yet unknown process allows the solely convective cores of low mass stars to produce sufficient magnetic fields to power such outbursts.

However, subsequent studies using Doppler spectroscopy failed to detect the radial velocity variations that would be expected if such a planet was orbiting this small star.