HIP 99770 b
HIP 99770 b is a exoplanet orbiting HIP 99770 in the constellation Cygnus. It lies about 131 light-years from Earth and was discovered in 2023 using the imaging method.
Is HIP 99770 b in the Habitable Zone?
The position of HIP 99770 b relative to the habitable zone of HIP 99770 cannot be precisely determined from the available orbital data.
Orbit and Year Length
HIP 99770 b orbits at an average distance of 15.800 AU. Its orbit is highly elliptical (eccentricity 0.31), swinging dramatically closer to and farther from its star.
How Was HIP 99770 b Discovered?
HIP 99770 b was discovered in 2023 using the imaging method, with observations from Multiple Observatories.
Direct imaging captures actual pictures of a planet by blocking out the overwhelming glare of its host star. It works best for young, hot, massive planets on wide orbits.
How Far Away Is HIP 99770 b?
HIP 99770 b is 130.7 light-years (40.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1896. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,300,320 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 99770 b scores 0.12, ranking #4,319 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HIP 99770
HIP 99770
- Mass
- 1.90 M☉
Planetary System
HIP 99770 b is the only planet known to orbit HIP 99770 so far.
HIP 99770 b — Complete Data
| Mass | 5,403.08 Earth masses (17.000 Jupiter masses) |
|---|---|
| Orbital distance | 15.800 AU |
| Eccentricity | 0.310 |
| Earth Similarity Index | 0.12 |
| Distance from Earth | 130.7 light-years (40.1 parsecs) |
| Constellation | Cygnus |
| Discovery method | Imaging |
| Discovery facility | Multiple Observatories |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2026-04-09. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HIP 99770 b
Is HIP 99770 b habitable?
HIP 99770 b is not known to orbit within the habitable zone of HIP 99770.
How far away is HIP 99770 b?
HIP 99770 b is about 131 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,300,320 years to get there.
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