HD 145377 b
HD 145377 b is a cold gas giant orbiting HD 145377 in the constellation Scorpius. It lies about 175 light-years from Earth and was discovered in 2008 using the radial velocity method.
Is HD 145377 b in the Habitable Zone?
HD 145377 b orbits inside the inner edge of the habitable zone of HD 145377. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 145377: 0.842–1.971 AU (conservative: 1.066–1.869 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Orbit and Year Length
A year on HD 145377 b — one full orbit around HD 145377 — lasts 104.0 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.450 AU — comparable to the inner Solar System. Its orbit is highly elliptical (eccentricity 0.31), swinging dramatically closer to and farther from its star.
How Was HD 145377 b Discovered?
HD 145377 b was discovered in 2008 using the radial velocity method, with observations from La Silla Observatory.
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 145377 b?
HD 145377 b is 174.5 light-years (53.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1852. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,071,200 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 145377 b scores 0.18, ranking #4,031 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 145377
HD 145377
- Surface temperature
- 6,014 K (Sun: 5,772 K)
- Mass
- 1.20 M☉
- Radius
- 1.05 R☉
Planetary System
HD 145377 b is the only planet known to orbit HD 145377 so far.
HD 145377 b — Complete Data
| Mass (best estimate) | 1,913.34 Earth masses |
|---|---|
| Orbital period | 103.95 days |
| Orbital distance | 0.450 AU |
| Eccentricity | 0.310 |
| Earth Similarity Index | 0.18 |
| Distance from Earth | 174.5 light-years (53.5 parsecs) |
| Constellation | Scorpius |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2008 |
Data: NASA Exoplanet Archive, last updated 2018-09-04. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 145377 b
Is HD 145377 b habitable?
No — HD 145377 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 145377 b?
HD 145377 b is about 175 light-years from Earth in the constellation Scorpius. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,071,200 years to get there.
How long is a year on HD 145377 b?
One orbit around HD 145377 takes 104.0 Earth days.
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