GJ 504

Star

GJ 504 (59 Virginis) — a young, Sun-like G0 star ~57 light-years away in Virgo, faintly visible to the naked eye. It hosts one of the few DIRECTLY IMAGED planets — and one of the coldest and lowest-mass giants ever photographed.

Open in 3D viewSee GJ 504 in the live, interactive 3D map

Key facts

Mass

2.43 × 10³⁰ kg

1.22 M☉

Radius

876,582 km

1.26× wider than the Sun

Surface temperature

6,234 K (5,961 °C)

Spectral type

G0V (a young Sun-like star)

Science

Physical

Mass: 2.43 × 10³⁰ kg · 1.22 M☉
Radius: 876,582 km · 1.26× wider than the Sun
Density: 860 kg/m³ · 0.86× water; Computed from mass and radius
Spectral type: G0V (a young Sun-like star)

Motion through space

Proper motion: 0.386 arcseconds per year · its drift across our sky; SIMBAD — 2020yCat.1350....0G, 2002ApJS..141..503N
Radial velocity: -27.0 km/s · approaching the Sun; SIMBAD — 2020yCat.1350....0G, 2002ApJS..141..503N
Speed across our line of sight: 32.2 km/s; Computed from proper motion and parallax
Speed through space, relative to the Sun: 42 km/s; Computed from proper motion, parallax and radial velocity

Composition

By mass: A young solar-type star (~1.2 solar masses), 57 light-years away in Virgo; also 59 Virginis.

Temperature

Surface: 6,234 K (5,961 °C)

Radiation & temperature

Luminosity: 8.27 × 10²⁶ W · 2.16 L☉
Surface temperature: 6,234 K (5,961 °C)
Peak wavelength: 465 nm · blue light; Computed (Wien's law) from the surface temperature

Discovery & history

Method: Telescope
Name: A Gliese-Jahreiß designation; also the Flamsteed name 59 Virginis.

A nearby, young Sun-like star; in 2013 the Subaru telescope's SEEDS survey captured a faint companion in its own light — GJ 504 b.

Images

Where to find it — in Virgo, the Maiden (IAU constellation chart). To the eye it is a single point of light; no telescope has imaged its surface. — IAU / Sky & Telescope, R. Sinnott & R. Fienberg (CC BY 3.0) · Wikimedia Commons

Images from open archives · credit shown per image