HIP 74890 b
HIP 74890 b is a cold gas giant orbiting the K1 III star HIP 74890 in the constellation Lupus. It lies about 257 light-years from Earth and was discovered in 2016 using the radial velocity method.
Is HIP 74890 b in the Habitable Zone?
HIP 74890 b orbits inside the inner edge of the habitable zone of HIP 74890. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HIP 74890: 3.194–7.770 AU (conservative: 4.046–7.366 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Orbit and Year Length
A year on HIP 74890 b — one full orbit around HIP 74890 — lasts 822.3 Earth days, longer than an Earth year. It orbits at an average distance of 2.100 AU. Its orbit is mildly elliptical (eccentricity 0.07).
How Was HIP 74890 b Discovered?
HIP 74890 b was discovered in 2016 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 HIP 74890 b?
HIP 74890 b is 256.5 light-years (78.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1770. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 4,514,400 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. HIP 74890 b scores 0.27, ranking #2,682 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HIP 74890
HIP 74890
- Spectral type
- K1 III
- Surface temperature
- 4,850 K (Sun: 5,772 K)
- Mass
- 1.74 M☉
- Radius
- 5.77 R☉
- Luminosity
- 16.3999 L☉
Planetary System
HIP 74890 b is the only planet known to orbit HIP 74890 so far.
HIP 74890 b — Complete Data
| Mass (best estimate) | 762.79 Earth masses |
|---|---|
| Orbital period | 822.30 days |
| Orbital distance | 2.100 AU |
| Eccentricity | 0.070 |
| Earth Similarity Index | 0.27 |
| Distance from Earth | 256.5 light-years (78.7 parsecs) |
| Constellation | Lupus |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2016 |
Data: NASA Exoplanet Archive, last updated 2016-03-16. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HIP 74890 b
Is HIP 74890 b habitable?
No — HIP 74890 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HIP 74890 b?
HIP 74890 b is about 257 light-years from Earth in the constellation Lupus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 4,514,400 years to get there.
How long is a year on HIP 74890 b?
One orbit around HIP 74890 takes 822.3 Earth days.
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