WASP-84 c
Astrophysical Synthesis & Habitability Characterization
WASP-84 c is a confirmed super-earth exoplanet orbiting the star WASP-84, located approximately 328.1 light-years (100.59 parsecs) from the Solar System. First announced in 2023 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.0542% across the stellar disk), this world measures 1.95 Earth radii and has a measured mass of 15.2 Earth masses. Combining its mass and radius yields a mean bulk density of 11.3 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 4 g⊕ (39.23 m/s²), and an escape velocity of 31.2 km/s.
In its orbital architecture around WASP-84, WASP-84 c completes one full revolution every 1.447 Earth days at a semi-major axis of 0.02359 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 177.4 km/s (compared to Earth's 29.8 km/s).
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1329 K (+1056°C / +1933°F) and receiving 1,452.18 S⊕ (~1,976,417 W/m²), WASP-84 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star WASP-84 is classified as an orange K-type star of spectral type K0 with an effective photospheric temperature of 5,280 K, a radius of 0.768 R☉, a mass of 0.853 M☉, an estimated bolometric luminosity of 0.411 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.1 Gyr and a metallicity of [Fe/H] = 0 dex (near-solar heavy-element abundance). From Earth, WASP-84 shines at apparent V-band magnitude 10.825 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The WASP-84 system is a multi-planet architecture hosting 2 confirmed worlds, with WASP-84 c sharing its stellar neighborhood alongside WASP-84 b.
Methodology: Computed using the Schulze-Makuch et al. (2011) weighted metric comparing physical interior (radius, estimated density) and surface thermal regime (escape velocity, equilibrium temperature).
Discovery Facility: Transiting Exoplanet Survey Satellite (TESS) · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | WASP-84 |
| Spectral Type | K0 |
| Effective Temp (Teff) | 5,280 K |
| Stellar Radius | 0.7680 R☉ |
| Stellar Mass | 0.8530 M☉ |
| Bolometric Luminosity | 0.411 L☉ |
| Metallicity [Fe/H] | 0.000 dex |
| Stellar Age | 2.100 Gyr |
| Apparent Magnitude | V: 10.825 · G: 10.575 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.023590 AU |
| Orbital Period | 1.447 days |
| Mean Orbital Velocity | 177.4 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 83.2000° |
| Mean Bulk Density | 11.3 g/cm³ (31.2 km/s vesc) |
| Insolation Flux | 1452.1800 S⊕ (~1,976,417 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 328.100 LY (100.588 pc) |