HD 18599 is 126 light-years from the Sun. The NASA Exoplanet Archive lists 1 planet around this K2 V star; the first was found in 2022 by transit (Transiting Exoplanet Survey Satellite (TESS)).
Fly there in 3DHD 18599 b goes round its star every 4.14 days, 21 times as often as Mercury goes round the Sun.
HD 18599 is one of 2 stars in its system: the other is drawn where the Washington Double Star Catalog measures it on the sky.
| Spectral type | K2 V |
| Surface temperature | 5,145 K |
| Mass | 0.863 solar masses |
| Radius | 0.767 solar radii |
| Luminosity | 0.372 times the Sun |
| Apparent magnitude | 8.99 |
| Age | about 0.4 billion years |
| Distance from the Sun | 125.8 light-years (38.6 parsecs) |
| Position (J2000) | RA 44.2620°, Dec -56.1919° |
| Constellation | Horologium |
HD 18599 A has no spectral type listed of magnitude 10.27, moving through space with it. In 2016 it was 87.4″ from HD 18599, at position angle 182° (Washington Double Star Catalog, 02570-5613 TOK 233 AC): 3,371 AU on the sky at this distance. The true distance can only be larger. Its colour is estimated from its brightness.
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| HD 18599 b | 4.14 days | 0.0480 AU | 2.6 R⊕ | 24.1 M⊕ | Transit, 2022 |
Values are the NASA Exoplanet Archive’s composite parameters. A radius marked estimated comes from a mass–radius relation; a mass marked minimum is M sin i. Planet sizes and colours in the 3D view are renderings: none of these worlds has been photographed as more than a point of light.