HD 99492 is 59.4 light-years from the Sun. The NASA Exoplanet Archive lists 2 planets around this K2 V star; the first was found in 2004 by radial velocity (W. M. Keck Observatory).
Fly there in 3DHD 99492 b goes round its star every 17.1 days, 5 times as often as Mercury goes round the Sun.
HD 99492 is one of 2 stars in its system: the other is drawn where the Washington Double Star Catalog measures it on the sky.
Where the archive gives only a period or only an orbit size, the other is worked out from Kepler’s third law with the star’s mass.
| Spectral type | K2 V |
| Surface temperature | 4,929 K |
| Mass | 0.85 solar masses |
| Radius | 0.822539 solar radii |
| Luminosity | 0.335 times the Sun |
| Apparent magnitude | 7.56727 |
| Age | about 4.8 billion years |
| Distance from the Sun | 59.4 light-years (18.2 parsecs) |
| Position (J2000) | RA 171.6897°, Dec 3.0071° |
| Constellation | Leo |
HD 99492 A is a G7V star of magnitude 6.55, with a computed orbit. In 2019 it was 28.6″ from HD 99492, at position angle 326° (Washington Double Star Catalog, 11268+0301 STF1540 AB): 521 AU on the sky at this distance. The true distance can only be larger.
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| HD 99492 c | 95.2 days | 0.387 AU from Kepler’s law | 4.42 R⊕ estimated | 17.9 M⊕ minimum | Radial Velocity, 2023 |
| HD 99492 b | 17.1 days | 0.120 AU | 5.44 R⊕ estimated | 25.5 M⊕ minimum | Radial Velocity, 2004 |
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.