HD 95735 c
HD 95735 c is a Neptune-like planet orbiting GJ 411 in the constellation Ursa Major. It lies about 19 light-years from Earth and was discovered in 2021 using the radial velocity method.
Is HD 95735 c in the Habitable Zone?
HD 95735 c orbits beyond the outer edge of the habitable zone of GJ 411. At that distance, any surface water would almost certainly be frozen.
Habitable zone of GJ 411: 0.124–0.320 AU (conservative: 0.158–0.303 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 95735 c — one full orbit around GJ 411 — lasts 2,946.0 Earth days, longer than an Earth year. It orbits at an average distance of 2.940 AU. Its orbit is mildly elliptical (eccentricity 0.13).
How Was HD 95735 c Discovered?
HD 95735 c was discovered in 2021 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 HD 95735 c?
HD 95735 c is 18.5 light-years (5.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 2008. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 325,600 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 95735 c scores 0.19, ranking #4,008 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: GJ 411
GJ 411
- Surface temperature
- 3,719 K (Sun: 5,772 K)
- Mass
- 0.39 M☉
- Radius
- 0.37 R☉
- Age
- 8.0 billion years (Sun: 4.6)
The GJ 411 Planetary System
HD 95735 c is one of 2 known planets in the GJ 411 system. Its siblings:
- GJ 411 b (Super Earth)
HD 95735 c — Complete Data
| Mass (best estimate) | 13.60 Earth masses |
|---|---|
| Orbital period | 2,946.00 days |
| Orbital distance | 2.940 AU |
| Eccentricity | 0.132 |
| Earth Similarity Index | 0.19 |
| Distance from Earth | 18.5 light-years (5.7 parsecs) |
| Constellation | Ursa Major |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2022-05-24. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 95735 c
Is HD 95735 c habitable?
No — HD 95735 c orbits outside the habitable zone of GJ 411 and is likely too cold for liquid water on its surface.
How far away is HD 95735 c?
HD 95735 c is about 19 light-years from Earth in the constellation Ursa Major. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 325,600 years to get there.
How long is a year on HD 95735 c?
One orbit around GJ 411 takes 2,946.0 Earth days.
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