VB 10
An animation of images taken with the 200 in (5.1 m) Hale Telescope over a period of nine years showing the proper motion of VB 10. | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 16m 57.61s |
| Declination | +05° 09′ 01.6″ |
| Apparent magnitude (V) | 17.30 |
| Characteristics | |
| Spectral type | M8.0V |
| Apparent magnitude (B) | ~19.42 |
| Apparent magnitude (R) | ~15.6 |
| Apparent magnitude (J) | 9.908 ±0.025 |
| Apparent magnitude (H) | 9.226 ±0.026 |
| Apparent magnitude (K) | 8.765 ±0.022 |
| Variable type | UV |
| Astrometry | |
| Proper motion (μ) | RA: −599 mas/yr Dec.: −1,366 mas/yr |
| Parallax (π) | 168.9537±0.0668 mas |
| Distance | 19.304 ± 0.008 ly (5.919 ± 0.002 pc) |
| Absolute magnitude (MV) | 18.7 |
| Details | |
| Mass | 0.0881+0.0026 −0.0024 M☉ |
| Radius | 0.1183+0.0059 −0.0057 R☉ |
| Luminosity (bolometric) | 0.000499±0.000004 L☉ |
| Luminosity (visual, LV) | 0.000003 L☉ |
| Surface gravity (log g) | 5.5 cgs |
| Temperature | 2,508+63 −60 K |
| Metallicity | ~0 |
| Rotation | 23.6 days |
| Rotational velocity (v sin i) | 6.5 km/s |
| Age | ~1 Gyr |
| Other designations | |
| 2MASS J19165762+0509021, V1298 Aquilae, Gliese 752 B, Van Biesbroeck's Star | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
VB 10 or Van Biesbroeck's star /vænˈbiːzbrʊk/ is a small and dim red dwarf located in the constellation Aquila. It is part of a binary star system. VB 10 is historically notable as it was the least luminous and least massive known star from its discovery in 1944, until 1982 when LHS 2924 was shown to be less luminous. 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 is also the primary standard for the M8V spectral class.