HIP 107773 b
HIP 107773 b is a cold gas giant orbiting the K1 III star HIP 107773 in the constellation Indus. It lies about 343 light-years from Earth and was discovered in 2015 using the radial velocity method.
Is HIP 107773 b in the Habitable Zone?
HIP 107773 b orbits inside the inner edge of the habitable zone of HIP 107773. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HIP 107773: 6.761–16.384 AU (conservative: 8.564–15.533 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 107773 b — one full orbit around HIP 107773 — lasts 144.3 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.720 AU — comparable to the inner Solar System. Its orbit is mildly elliptical (eccentricity 0.09).
How Was HIP 107773 b Discovered?
HIP 107773 b was discovered in 2015 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 107773 b?
HIP 107773 b is 343.1 light-years (105.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1683. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 6,038,560 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 107773 b scores 0.07, ranking #4,813 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HIP 107773
HIP 107773
- Spectral type
- K1 III
- Surface temperature
- 4,945 K (Sun: 5,772 K)
- Mass
- 2.42 M☉
- Radius
- 11.60 R☉
- Luminosity
- 74.1310 L☉
Planetary System
HIP 107773 b is the only planet known to orbit HIP 107773 so far.
HIP 107773 b — Complete Data
| Mass (best estimate) | 629.30 Earth masses |
|---|---|
| Orbital period | 144.30 days |
| Orbital distance | 0.720 AU |
| Eccentricity | 0.090 |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 343.1 light-years (105.2 parsecs) |
| Constellation | Indus |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2015 |
Data: NASA Exoplanet Archive, last updated 2015-06-04. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HIP 107773 b
Is HIP 107773 b habitable?
No — HIP 107773 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HIP 107773 b?
HIP 107773 b is about 343 light-years from Earth in the constellation Indus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 6,038,560 years to get there.
How long is a year on HIP 107773 b?
One orbit around HIP 107773 takes 144.3 Earth days.
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