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Entering orbit…
Habitability
30/ 100
Extremely Harsh
BD-06 1339 d rendered in TerraForge from its measured mass, orbit and star

BD-06 1339 d

Also written BD-06 1339d, BD 06 1339d, BD 06 1339 d

Ice GiantExtremely Harsh65 light years awayFound 2014
exoplanet.euListed by the Extrasolar Planets Encyclopaedia; not yet in NASA's confirmed catalogue.View on exoplanet.eu

Estimated: this planet doesn't transit its star, so its size is inferred, not measured

BD-06 1339 d, from the Extrasolar Planets Encyclopaedia (found 2014). Measured: 18.5 Earth masses, 1.06 AU, a 4324 K K-type star. Composition inferred from a estimated bulk density of 0.20x Earth's, modeled rather than measured since this isn't a transiting planet, larger than even a pure water/ice world of this mass, suggesting a water-rich interior under roughly a 23% hydrogen/helium envelope by mass, with an assumed 24-hour day — rotation cannot be measured for exoplanets.

Host star

BD-06 1339

Type
K-type (Orange)
Spectral type
K7V/M0V
Temperature
4,324 K
Mass
0.7 ☉
Known planets
4, including this one

Published by the Extrasolar Planets Encyclopaedia. This star’s luminosity has not been published, so this world’s temperature and habitability score fall back to a typical K-type star.

Ice Giant

Magnetic FieldModerate Activity
Why is this a Ice Giant?
BD-06 1339 d has moderate mass (18.5x Earth) with significant water, carbon, and nitrogen content, characteristic of ice giants.
Ice giants like Uranus and Neptune have icy interiors with thick atmospheres of hydrogen and helium, but not enough to be classified as gas giants.
Classification Criteria:
✓ Mass: 18.5x Earth (5-20x range)✓ Water/Carbon/Nitrogen rich composition

Reading BD-06 1339 d’s atmosphere

Dominant elements: H, O, He, Si, Fe, NThis is what a telescope would measure while BD-06 1339 d crosses in front of its star: starlight passes through the atmosphere and spreads into a rainbow band. Each dark line marks a wavelength the atmosphere absorbed.Every element absorbs its own signature wavelengths — hydrogen always darkens the same two spots, calcium another pair, and so on. Astronomers match the lines in a real spectrum against a library of these signatures to say what an atmosphere is made of, light-years away, without ever visiting. A deeper line generally means more of that element is present.BD-06 1339 d sits about 65 light-years away, found by the radial velocity method. Most catalogued distances trace back to parallax: as Earth orbits the Sun, a nearby star appears to shift very slightly against the distant background stars, and the size of that shift gives its distance directly.
Further reading
ExoplanetsSara Seager (editor)The field's standard reference: how planets are found, how they form, and what their atmospheres are made of.The Planet FactoryElizabeth TaskerHow planets are made, and why so few of them come out like Earth.Exoplanets: Diamond Worlds, Super Earths, Pulsar PlanetsMichael Summers & James TrefilThe strange end of the catalogue — carbon worlds, molten rock, planets orbiting dead stars.The Little Book of ExoplanetsJoshua WinnHow these worlds are found, and what a measurement can honestly tell us.
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Habitability ScoreExtremely Harsh
30
Contributing Factors
temperature40
Extreme temperature - very difficult for life
atmosphere30
Hydrogen-rich atmosphere typical of gas giants
water15
No solid surface — any water is locked in a supercritical mantle and hot ice, not oceans
magnetic Field100
Magnetic field provides radiation protection
geology90
Active geology recycles nutrients and drives carbon cycle
Organic Chemistry80
Core organic elements (CHNO) present
rotation100
Optimal rotation period - balanced day/night cycle, moderate weather, and good heat distribution

Physical Properties

Mass
18.50x Earth (1.10e+26 kg)
Radius
2.64x Earth (16,850 km)
This planet: 2.64× Earth radiusEarth: 1× (baseline)
Surface Gravity
2.64x Earth (25.9 m/s²)
Surface Temperature
223 K (-51 °C / -59 °F)
Rotation Period
24.0 hours/day
This planet: 24 h/dayEarth: 24 h/day

Orbital Environment

Star Type
K-type (Orange)
Distance from Star
1.06 AU (159 million km)
Orbital Period
1.30 years

Atmosphere

Hydrogen and helium with water, methane, and ammonia ices

Elemental Composition

H - Hydrogen
54.7%
O - Oxygen
24.6%
He - Helium
7.0%

Surface Characteristics

Icy mantle surrounding rocky core, with hydrogen-helium atmosphere
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The surface of TOI-700 d as TerraForge draws it: red-leaved trees over green ground under a lavender sky

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The surface view's bottom row of buttons on a phone, with an arrow pointing to the VR button beside full screen

Tap it, drop your phone into a headset viewer, and you're standing on the ground under a star that isn't ours. It only appears where your browser can do VR.

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