Host star — Kepler-1552
- Spectral type
- —
- Temperature
- 5,202 K
- Radius
- 0.78 R☉
- Mass
- 0.85 M☉
- Luminosity
- 0.629 L☉
- Distance
- 769.1 pc (2,508 ly)
Similar to our Sun (5,778 K).
Kepler-1552 b
Orbits Kepler-1552 · 2,508 light-years from Earth
Super-EarthTransit2016ESI 80 · Very Earth-like
Radius
2.47×
Earth
Mass
6.7×
Earth
Year
185d
Temp
268 K
-5°C
Gravity
1.1×
Earth
Distance
2,508
ly
Could life exist here?
AI analysisKepler-1552 b is a super-Earth roughly two and a half times Earth's radius, orbiting a small, cool star every 185 days at a comfortable distance of 0.601 AU. Its equilibrium temperature of 268 K—about minus five degrees Celsius—falls within the range where liquid water could exist on a planetary surface, assuming a suitable atmosphere. The planet's density of 2.43 grams per cubic centimeter suggests a rocky composition rather than a gas giant, and its circular orbit provides stable long-term conditions. However, we know little about its actual atmosphere, magnetic field, or geological activity, all of which would be essential for habitability. The habitability score of 80 out of 100 reflects this tantalizing promise tempered by real uncertainties. At 2,510 light-years away, Kepler-1552 b is too distant for detailed atmospheric study with current technology, yet its discovery via transit method offers hope that future observations might reveal whether it truly hosts conditions conducive to life.
What it would be like
Kepler-1552 b is a super-Earth — larger than our planet but likely still rocky or ice-rich. Whether it has a thin atmosphere like Mars or a crushing one like Venus remains unknown.
Surface gravity is about 1.1g — noticeably heavier what you're used to on Earth.
With an equilibrium temperature around -5°C, this planet sits in the temperature range where liquid water could potentially exist on the surface — a key ingredient for life as we know it.
An orbital period of 185 days makes the year 2.0× shorter than Earth's. You'd celebrate your birthday more often here.
Earth comparison
Logarithmic bars so Jupiter-class planets fit the same scale as Earth-size worlds.
Radius2.47R⊕
1/25×Earth = 125×
Mass6.66M⊕
1/10000×Earth = 110000×
Surface gravity1.09g
1/100×Earth = 1100×
Equilibrium temp268 K(-5°C)
0 KEarth 255 K2500 K
Side-by-side with Earth
Temperature in context
Liquid N₂Mars avgEarth eq.Earth sfc.Boiling H₂OVenus
Discovery & orbit
- Method
- Transit
- Year
- 2016
- Facility
- Kepler
- Semi-major axis
- 0.6011 AU
- Period
- 184.77 days
- Eccentricity
- 0.0000
- Density
- 2.43 g/cm³
Detected by measuring the tiny dip in starlight as the planet crosses in front of its star.
Nearly circular orbit.
Low density — probably icy or gas-rich.
Discovered via · Transit
Tiny dip in starlight as the planet crosses in front of its star
A transit photometer watches a star nonstop and measures its brightness to ~0.01%. When a planet passes between us and the star, the star dims briefly — the deeper the dip, the bigger the planet. This is how Kepler and TESS found most known exoplanets.
- Overall share
- ~75% of all confirmed worlds
- Best for
- Earth-to-Neptune-sized planets on short orbits
Orbital Animation
Kepler-1552Kepler-1552 bOrbitEarth orbitHabitable zone
Drag to rotate · scroll to zoomSemi-major axis: 0.601 AUEccentricity: 0.0000Period: 184.8 days
Hertzsprung–Russell Diagram
Where this host star sits among … exoplanet host stars. The main sequence band runs diagonally — giants and supergiants sit above, white dwarfs below.
OBAFGKMCurrent star
How far is 2,508 light-years?
- A light beam leaving Earth right now would arrive in 2,508 years.
- At Voyager 1's speed (17 km/s), the trip would take approximately 44.2 million years.
- A radio signal sent today would arrive in 2508.5 years — and the reply wouldn't come back for twice that.
Earth Similarity Index
80/1000 — Nothing like Earth100 — Identical to Earth
ESI combines radius similarity and equilibrium temperature similarity. Earth = 100. Mars ≈ 73. Venus ≈ 44. This score reflects two physical parameters only — not atmosphere, water, or magnetic field.