The planets / WASP-39 b

Buy A Galaxy · original commissioned reconstruction

Artist's Reconstruction · View astronomy source

Artist's ReconstructionFull image credit, source & interpretation

Artist's reconstruction based on published astronomical observations and current scientific understanding.

A real exoplanet. A gift made personal.

WASP-39 b

Name: WASP-39 b personalised planet gift
Brand: Buy A Galaxy

Official catalogue designation: WASP-39 b

Your name for it: Planet Brenda

A low-density gas giant with a vast, hot atmosphere that Webb has examined molecule by molecule. Roughly Saturn’s mass, yet larger than Jupiter.

Planet type: Puffy hot gas giant
Distance from Earth: c. 700 light-years
Constellation: Virgo
Planet radius: 1.28 × Jupiter
Host star: WASP-39
Orbital period: c. 4.1 days

Values are rounded estimates and may be refined by further observations. Personal names remain ceremonial.

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A personalised planet gift preview. No order or reservation is made.

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Give infinity a personal touch.

Planet nameFor example, Planet Brenda. Completely unofficial. Up to 60 characters.

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At launch, digital editions are available worldwide. A4, A3, Framed A3 and A2 Framed Print packages are available in the UK, with international print delivery planned.

Your gift formatDigital EditionPersonalised poster, certificate and object information sheet as digital files. Available worldwide.£6.99A4 Print PackageTwo physical A4 pieces: a personalised poster and certificate, plus a printed information sheet. United Kingdom only at launch · international print delivery planned.£19.99A3 Print PackageMOST POPULARA larger A3 poster with a separate A4 printed certificate and printed information sheet. United Kingdom only at launch · international print delivery planned.£31.99Framed A3 PackageA framed A3 poster, separate A4 printed certificate and printed information sheet, with digital poster and certificate copies. United Kingdom only at launch · international print delivery planned.£46.99A2 Framed PrintA3 artwork mounted within a larger A2 frame, with an A4 printed certificate, information sheet and digital copies. United Kingdom only at launch · international print delivery planned.£58.99

Illustrative launch pricing. Ordering opens on 23 October 2026.

Poster in the approved design for wasp-39-b, personalised as Planet Brenda

A3 Print Package

A3 poster + A4 printed certificate. Information sheet included.

Planet-Poster in the approved design for wasp-39-b, personalised as Planet Brenda

Planet-Certificate in the approved design for wasp-39-b, personalised as Planet Brenda

Paper sizes shown in proportion. Tap either piece to inspect your personalisation.

Live preview · your selected galaxy and personalisation.
Registration number is a demonstration, not a saved registry entry. Artwork image credit

A world with a story

More than a beautiful planet.

Host star: WASP-39
Star type: G-type star
Planet radius: 1.28 × Jupiter
Planet mass: 0.281 × Jupiter
Orbital period: c. 4.1 days
Orbital distance: 0.04828 AU
Discovery: 2011 · Transit

Values are rounded from published catalogue measurements. Sky coordinates identify the host system, not a resolved planetary surface.

A giant with surprisingly little heft

WASP-39 b combines a radius about 1.28 times Jupiter’s with less than a third of its mass. Its unusually inflated atmosphere makes it a valuable target for studying gas giants.

An atmosphere under examination

Webb spectra reveal water vapour, carbon dioxide and other gases. Sulfur dioxide provides evidence of chemistry driven by stellar light. These are measurements of filtered starlight, rather than close-up photographs of clouds.

One year. Four days.

The planet orbits a G-type star about every 4.1 days, far closer than Mercury orbits the Sun. It is a hot gaseous world, without the solid landscape suggested by an Earth-like planet.

Two rather different horizons

Webb observations reported in 2024 found differences between the morning and evening sides of the atmosphere. The analysis suggests differences in temperature and cloud cover. Even planetary weather refuses to be straightforward.

The view we have imagined

Soft pearl and tan clouds meet slate-blue shadows under light from an off-frame star. Cloud textures, exact colours and illumination are an interpretation informed by the atmospheric observations, not observed surface features.

A gift with room to breathe

Your personal name sits beside the real designation and astronomical facts. We supply the artwork and ceremonial certificate; the atmosphere remains considerably beyond our control.