HD 194490 b
HD 194490 b is a cold gas giant orbiting HD 194490 in the constellation Telescopium. It lies about 262 light-years from Earth and was discovered in 2022 using the radial velocity method.
Is HD 194490 b in the Habitable Zone?
The position of HD 194490 b relative to the habitable zone of HD 194490 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 194490 b — one full orbit around HD 194490 — lasts 13,092.2 Earth days, longer than Jupiter's 12-year orbit. It orbits at an average distance of 11.116 AU. Its orbit is mildly elliptical (eccentricity 0.25).
How Was HD 194490 b Discovered?
HD 194490 b was discovered in 2022 using the radial velocity method, with observations from Multiple Observatories.
The radial velocity method measures the subtle wobble of a star caused by the gravitational pull of an orbiting planet, visible as periodic shifts in the star's light spectrum. The size of the wobble reveals the planet's minimum mass.
How Far Away Is HD 194490 b?
HD 194490 b is 261.7 light-years (80.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1765. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 4,605,920 years to make the journey.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. HD 194490 b scores 0.08, ranking #4,594 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 194490
HD 194490
- Mass
- 1.06 M☉
Planetary System
HD 194490 b is the only planet known to orbit HD 194490 so far.
HD 194490 b — Complete Data
| Mass | 3,561.90 Earth masses (11.207 Jupiter masses) |
|---|---|
| Orbital period | 13,092.18 days |
| Orbital distance | 11.116 AU |
| Eccentricity | 0.251 |
| Earth Similarity Index | 0.08 |
| Distance from Earth | 261.7 light-years (80.2 parsecs) |
| Constellation | Telescopium |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2023-06-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 194490 b
Is HD 194490 b habitable?
HD 194490 b is not known to orbit within the habitable zone of HD 194490, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is HD 194490 b?
HD 194490 b is about 262 light-years from Earth in the constellation Telescopium. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 4,605,920 years to get there.
How long is a year on HD 194490 b?
One orbit around HD 194490 takes 13,092.2 Earth days.
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