HD 70573 b
HD 70573 b is a cold gas giant orbiting the G1-1.5 V star HD 70573 in the constellation Hydra. It lies about 193 light-years from Earth and was discovered in 2007 using the radial velocity method.
Is HD 70573 b in the Habitable Zone?
The position of HD 70573 b relative to the habitable zone of HD 70573 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 70573 b — one full orbit around HD 70573 — lasts 851.8 Earth days, longer than an Earth year. It orbits at an average distance of 1.760 AU. Its orbit is highly elliptical (eccentricity 0.40), swinging dramatically closer to and farther from its star.
How Was HD 70573 b Discovered?
HD 70573 b was discovered in 2007 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 70573 b?
HD 70573 b is 193.0 light-years (59.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1833. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,396,800 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 70573 b scores 0.31, ranking #1,209 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 70573
HD 70573
- Spectral type
- G1-1.5 V
- Surface temperature
- 5,737 K (Sun: 5,772 K)
- Mass
- 1.00 M☉
- Age
- 0.1 billion years (Sun: 4.6)
Planetary System
HD 70573 b is the only planet known to orbit HD 70573 so far.
HD 70573 b — Complete Data
| Mass (best estimate) | 1,900.00 Earth masses |
|---|---|
| Orbital period | 851.80 days |
| Orbital distance | 1.760 AU |
| Eccentricity | 0.400 |
| Earth Similarity Index | 0.31 |
| Distance from Earth | 193.0 light-years (59.2 parsecs) |
| Constellation | Hydra |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2007 |
Data: NASA Exoplanet Archive, last updated 2015-03-26. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 70573 b
Is HD 70573 b habitable?
HD 70573 b is not known to orbit within the habitable zone of HD 70573, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is HD 70573 b?
HD 70573 b is about 193 light-years from Earth in the constellation Hydra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,396,800 years to get there.
How long is a year on HD 70573 b?
One orbit around HD 70573 takes 851.8 Earth days.
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