11 Com b
11 Com b is a exoplanet orbiting the G8 III star 11 Com in the constellation Coma Berenices. It lies about 304 light-years from Earth and was discovered in 2007 using the radial velocity method.
Is 11 Com b in the Habitable Zone?
11 Com b orbits inside the inner edge of the habitable zone of 11 Com. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of 11 Com: 7.683–18.672 AU (conservative: 9.732–17.703 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Orbit and Year Length
A year on 11 Com b — one full orbit around 11 Com — lasts 323.2 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 1.178 AU. Its orbit is mildly elliptical (eccentricity 0.24).
How Was 11 Com b Discovered?
11 Com b was discovered in 2007 using the radial velocity method, with observations from Xinglong Station.
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 11 Com b?
11 Com b is 303.9 light-years (93.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1723. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 5,348,640 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. 11 Com b scores 0.09, ranking #4,541 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: 11 Com
11 Com b belongs to a system of 2 stars; it orbits 11 Com.
11 Com
- Spectral type
- G8 III
- Surface temperature
- 4,874 K (Sun: 5,772 K)
- Mass
- 2.09 M☉
- Radius
- 13.76 R☉
- Luminosity
- 95.1108 L☉
Planetary System
11 Com b is the only planet known to orbit 11 Com so far.
11 Com b — Complete Data
| Mass (best estimate) | 4,914.90 Earth masses |
|---|---|
| Orbital period | 323.21 days |
| Orbital distance | 1.178 AU |
| Eccentricity | 0.238 |
| Earth Similarity Index | 0.09 |
| Distance from Earth | 303.9 light-years (93.2 parsecs) |
| Constellation | Coma Berenices |
| Discovery method | Radial Velocity |
| Discovery facility | Xinglong Station |
| Discovery year | 2007 |
Data: NASA Exoplanet Archive, last updated 2023-09-19. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About 11 Com b
Is 11 Com b habitable?
No — 11 Com b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is 11 Com b?
11 Com b is about 304 light-years from Earth in the constellation Coma Berenices. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 5,348,640 years to get there.
How long is a year on 11 Com b?
One orbit around 11 Com takes 323.2 Earth days.
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