SOL SYSTEM / PLANETARY DOSSIER

Gonggong

Gonggong is a reddish icy world on an elongated orbit that takes about five and a half centuries to complete. Its moon Xiangliu helps astronomers measure the mass of the system.

Planetary view ↗

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Artist’s impression of Gonggong

Dwarf planet candidateAn inclined, elongated orbit and a small companion in the distant solar system.

Environment ↗

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DIAMETER / EARTH0.10×
EARTHGONGGONG
ATMOSPHERE
An environment still being studiedNo measured composition chart
SURFACE TEMPERATURE
Very cold · no local measurements
SURFACE PRESSURE
Not established at a landing site
HABITABILITYNo life detected
UNPROTECTED HUMANSNot survivable

Interior ↗

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Gonggong interiorGonggong's internal structure is unresolved.Unresolved

System ↗

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Xiangliu1 companionSYSTEM OVERVIEW · NOT TO SCALE

Landscape ↗

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Hypothetical ground-level landscape of Gonggong. Color and broad material choices follow remote observations; terrain, lighting and local details are artistic interpretation, not a mapped or photographed site.
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Rotation ↗

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Gonggong rotationThe rotation period is unresolved. Static portrait, not an orientation prediction.PERIOD UNCERTAINNO UNIQUE PERIOD ADOPTED

Gravity ↗

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GRAVITY CONSTRAINTSMODEL-DEPENDENT

Orbit ↗

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Gonggong orbitElliptical orbit viewed along the orbital axis, relative to Sun. Motion is accelerated, not a live position. Distances are center to center.SUNGONGGONG101.00 AU33.10 AU
Sources ↗
GONGGONG

Instrument detail

Gonggong orbitElliptical orbit viewed along the orbital axis, relative to Sun. Motion is accelerated, not a live position. Distances are center to center.SUNGONGGONG101.00 AU33.10 AU
ONE ORBIT≈ 550 Earth years
Closest to the Sun
33.10 AU
Farthest from the Sun
101.00 AU

The Sun sits at a focus of the orbit. Gonggong moves faster near the Sun and more slowly farther away.

A simplified ellipse from rounded JPL orbital elements at epoch JD 2461200.5. The moving marker is illustrative, not a current position. Orbital inclination and perturbations are omitted.

Gonggong rotationThe rotation period is unresolved. Static portrait, not an orientation prediction.PERIOD UNCERTAINNO UNIQUE PERIOD ADOPTED
ROTATION STATEUncertain

An unresolved spin period

Brightness measurements admit competing rotation-period interpretations. No unique spin period is adopted for this view; the static portrait does not imply that Gonggong is motionless or tumbling chaotically.

Satellite atlasMoons
Xiangliu1 companionSYSTEM OVERVIEW · NOT TO SCALE

Gonggong and its surroundings

The orbit of Gonggong’s companion Xiangliu provides a way to estimate the system’s mass. The two bodies also differ in color. A moon can reveal both the gravitational character and the contrasting surface history of its parent system.

The illustration identifies companions without assigning orbital periods, distances or present-day positions. Body sizes and spacing are schematic.

GRAVITY CONSTRAINTSMODEL-DEPENDENT
SURFACE GRAVITYModel-dependent

Mass, size and shape

Surface gravity requires the body’s own mass and radius. Size estimates and the division of mass between binary components introduce model assumptions. No single numerical jump comparison is adopted here.

Gonggong interiorGonggong's internal structure is unresolved.Unresolved

Beyond the surface

Remote observations constrain surface materials and bulk properties, but do not map internal layer boundaries. A precise core, shell thickness or present-day ocean is not established by this view.

    Artist’s impression of Gonggong

    A red world with open questions.

    Gonggong’s unusually red color is a measured property; detailed surface geography is not. Radiation-driven chemistry has been proposed to explain the color. The red icy ground illustrated here turns that broad clue into a hypothetical visitor’s view.

    A long way in. A long way out.

    Its strongly elongated orbit brings Gonggong from roughly Pluto-like solar distances to far beyond them. One revolution takes about five and a half centuries. A single distance marker cannot capture the full extent of that journey.

    Xiangliu changes the picture.

    The orbit of Gonggong’s companion Xiangliu provides a way to estimate the system’s mass. The two bodies also differ in color. A moon can reveal both the gravitational character and the contrasting surface history of its parent system.

    A size inferred from distant signals.

    Thermal measurements support a diameter near 1,230 kilometers. That estimate depends on how the surface emits and reflects radiation. It gives us a useful scale without pretending that we already know the shape of every ridge and crater.

    DIAMETER / EARTH0.10×
    EARTHGONGGONG
    EARTH
    12,756 km
    GONGGONG
    1,230 km
    approximate planet diameter / equatorial Earth diameter · rings excluded

    Thermal-model diameter 1,230 ± 50 km; this is a remote estimate, not a resolved outline.

    ATMOSPHERE
    An environment still being studiedNo measured composition chart

    A reliable atmospheric inventory is not available here. Unknown abundances are left unquantified rather than turned into percentage bars.

    SURFACE TEMPERATURE
    Very cold · no local measurements
    SURFACE PRESSURE
    Not established at a landing site
    HABITABILITYNo life detected

    There is no evidence of life here. Remote measurements do not establish a liquid-water habitat; the interior remains poorly constrained.

    UNPROTECTED HUMANSNot survivable

    The distant, cold environment offers no known breathable air or protective surface pressure. Human exploration would require a sealed, thermally controlled habitat.

    Planet and landscape images are artistic interpretations.

    • Research ↗
      • Classification and orbital data
      • Size, physical data and atmospheric constraints
      • Natural conditions and human survival
      • Color
      • Companion
      • Scale
    • NASA / JPL ↗
      • Rounded heliocentric orbital elements
      • Rotation measurements and uncertainty
    • lesia.obspm.fr ↗
      • Orbit
    Hypothetical ground-level landscape of Gonggong. Color and broad material choices follow remote observations; terrain, lighting and local details are artistic interpretation, not a mapped or photographed site.

    A ridge under distant sunlight

    Hypothetical ground-level landscape of Gonggong. Color and broad material choices follow remote observations; terrain, lighting and local details are artistic interpretation, not a mapped or photographed site.

    Hypothetical ground-level landscape of Gonggong. Color and broad material choices follow remote observations; terrain, lighting and local details are artistic interpretation, not a mapped or photographed site.

    Across a red-gray plain

    Hypothetical ground-level landscape of Gonggong. Color and broad material choices follow remote observations; terrain, lighting and local details are artistic interpretation, not a mapped or photographed site.

    Reddish-gray angular fragments partially embedded in a subdued icy granular matrix. An artistic reconstruction of Gonggong; local detail, lighting and viewpoint are imagined. The depicted environment is a possibility, not an observed surface or weather map.

    Fragments of a distant world

    Reddish-gray angular fragments partially embedded in a subdued icy granular matrix. An artistic reconstruction of Gonggong; local detail, lighting and viewpoint are imagined. The depicted environment is a possibility, not an observed surface or weather map.