Scholz's Star

VPHAS+ The primary is a red dwarf with a stellar classification of M and Jupiter masses. The secondary is probably a T5 brown dwarf with Jupiter masses. The system has 0.15 solar masses. The pair orbit at a distance of about with a period of roughly 4 years. The system has an apparent magnitude of 18.3, and is estimated to be between 3 and 10 billion years old. With a parallax of 166 mas (0.166 arcseconds), about 80 star systems are closer to the Sun. It is a late discovery, as far as nearby stars go, because of its dim magnitude and that past efforts concentrated on high-proper-motion objects. ==Solar System flyby==

Estimates indicate that the WISE 0720−0846 system passed about from the Sun about 70,000 years ago. Ninety-eight percent of mathematical simulations of the star system's trajectory indicated that it passed through the Solar System's Oort cloud, or within of the Sun. In a recent estimate, WISE J0720−0846AB passed within 68.7 ± 2.0 kAU of the Sun 80.5 ± 0.7 kyr ago. A later recalculation of the impact parameters using updated Solar System data showed that the perihelion distance during the encounter had a median value of 0.330 pc with a 90% probability of having come within 0.317–0.345 pc of the Sun; the associated time of perihelion passage was determined to be between 78.6–81.1 kyr ago with 90% confidence, with a most likely value of 79.9 kyr. A star is expected to pass through the Oort cloud every 100,000 years or so. An approach as close or closer than 52,000 AU is expected to occur about every 9 million years. In about 1.4 million years, Gliese 710 will come to a perihelion of between 8,800 and 13,700 AU. ==Naming==

The star was first discovered to be a nearby one by astronomer Ralf-Dieter Scholz, announced on arXiv in November 2013. Given the importance of the system having passed so close to the Solar System in prehistorical times, Eric Mamajek and collaborators dubbed the system Scholz's star in their paper discussing the star's velocity and past trajectory. == See also ==