HAT-P-44 c
HAT-P-44 c is a cold gas giant orbiting HAT-P-44 in the constellation Boötes. It lies about 1,135 light-years from Earth and was discovered in 2014 using the radial velocity method.
Is HAT-P-44 c in the Habitable Zone?
HAT-P-44 c orbits beyond the outer edge of the habitable zone of HAT-P-44. At that distance, any surface water would almost certainly be frozen.
Habitable zone of HAT-P-44: 0.617–1.476 AU (conservative: 0.782–1.399 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Orbit and Year Length
A year on HAT-P-44 c — one full orbit around HAT-P-44 — lasts 872.2 Earth days, longer than an Earth year. It orbits at an average distance of 1.752 AU. Its orbit is highly elliptical (eccentricity 0.49), swinging dramatically closer to and farther from its star.
How Was HAT-P-44 c Discovered?
HAT-P-44 c was discovered in 2014 using the radial velocity method, with observations from W. M. Keck 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 HAT-P-44 c?
HAT-P-44 c is 1,134.5 light-years (347.9 parsecs) from Earth. Light arriving here tonight left the planet about 1,135 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 19,967,200 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. HAT-P-44 c scores 0.25, ranking #2,999 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HAT-P-44
HAT-P-44
- Surface temperature
- 5,295 K (Sun: 5,772 K)
- Mass
- 0.94 M☉
- Radius
- 0.95 R☉
- Luminosity
- 0.6397 L☉
- Age
- 7.5 billion years (Sun: 4.6)
The HAT-P-44 Planetary System
HAT-P-44 c is one of 2 known planets in the HAT-P-44 system. Its siblings:
- HAT-P-44 b (Hot Jupiter)
HAT-P-44 c — Complete Data
| Mass (best estimate) | 1,271.30 Earth masses |
|---|---|
| Orbital period | 872.20 days |
| Orbital distance | 1.752 AU |
| Eccentricity | 0.494 |
| Earth Similarity Index | 0.25 |
| Distance from Earth | 1,134.5 light-years (347.9 parsecs) |
| Constellation | Boötes |
| Discovery method | Radial Velocity |
| Discovery facility | W. M. Keck Observatory |
| Discovery year | 2014 |
Data: NASA Exoplanet Archive, last updated 2014-05-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HAT-P-44 c
Is HAT-P-44 c habitable?
No — HAT-P-44 c orbits outside the habitable zone of HAT-P-44 and is likely too cold for liquid water on its surface.
How far away is HAT-P-44 c?
HAT-P-44 c is about 1,135 light-years from Earth in the constellation Boötes. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 19,967,200 years to get there.
How long is a year on HAT-P-44 c?
One orbit around HAT-P-44 takes 872.2 Earth days.
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