ome Ser b
ome Ser b is a cold gas giant orbiting the G8 III star ome Ser in the constellation Serpens. It lies about 250 light-years from Earth and was discovered in 2013 using the radial velocity method.
Is ome Ser b in the Habitable Zone?
ome Ser b orbits inside the inner edge of the habitable zone of ome Ser. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of ome Ser: 5.836–14.275 AU (conservative: 7.393–13.534 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 ome Ser b — one full orbit around ome Ser — lasts 278.6 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.838 AU — comparable to the inner Solar System. Its orbit is mildly elliptical (eccentricity 0.18).
How Was ome Ser b Discovered?
ome Ser b was discovered in 2013 using the radial velocity method, with observations from Okayama Astrophysical 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 ome Ser b?
ome Ser b is 250.3 light-years (76.8 parsecs) from Earth. Light arriving here tonight left the planet around the year 1776. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 4,405,280 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. ome Ser b scores 0.08, ranking #4,720 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: ome Ser
ome Ser b belongs to a system of 2 stars; it orbits ome Ser.
ome Ser
- Spectral type
- G8 III
- Surface temperature
- 4,724 K (Sun: 5,772 K)
- Mass
- 1.01 M☉
- Radius
- 10.99 R☉
- Luminosity
- 54.1801 L☉
Planetary System
ome Ser b is the only planet known to orbit ome Ser so far.
ome Ser b — Complete Data
| Mass (best estimate) | 233.92 Earth masses |
|---|---|
| Orbital period | 278.59 days |
| Orbital distance | 0.838 AU |
| Eccentricity | 0.180 |
| Earth Similarity Index | 0.08 |
| Distance from Earth | 250.3 light-years (76.8 parsecs) |
| Constellation | Serpens |
| Discovery method | Radial Velocity |
| Discovery facility | Okayama Astrophysical Observatory |
| Discovery year | 2013 |
Data: NASA Exoplanet Archive, last updated 2023-09-19. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About ome Ser b
Is ome Ser b habitable?
No — ome Ser b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is ome Ser b?
ome Ser b is about 250 light-years from Earth in the constellation Serpens. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 4,405,280 years to get there.
How long is a year on ome Ser b?
One orbit around ome Ser takes 278.6 Earth days.
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