Key parameters at a glance
- A radius of 10.40 Earth radii
- A mass of 305.12 Earth masses
- Surface gravity around 2.82 g
- An orbital period of 98.298 days
- Semi-major axis 0.4080 AU
- Equilibrium temperature 500 K (227 °C)
- Distance from Earth 777.48 light-years
- Earth Similarity Index 0.327
- Travel time at Voyager 1 speed 13,710,875 years
NGTS-30 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1738of 1771
top 98.1%
This planet
10.40R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | NGTS-30 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 10.40 | 11.21 |
| Mass (M⊕) | 1.00 | 305.12 | 317.83 |
| Density (g/cm³) | 5.51 | 1.49 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.82 | 2.53 |
| Insolation (S⊕) | 1.00 | 172.86 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 305.115 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 322807371
Gaia DR2
Gaia DR2 3533836281547278848
Gaia DR3
Gaia DR3 3533836281547278848
System
NGTS-30
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 98.30 Earth days (26.9% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.4080 AU.
Transit Fingerprint
Depth
1.006 %
Duration
6.130 h
Impact parameter b
0.777
Rp / R★
0.104500
Transit midpoint (BJD)
2,459,287.6000
Photometric dip
Transit produces a flux drop of 10,056 ppm lasting ≈ 6.13 h.
Extended Orbital Architecture
Planet / star radius ratio
0.104500
Impact parameter (b)
0.777
RV semi-amplitude (K)
46.100 m/s
Transit mid-time (BJD)
2,459,287.6000
Long. of periastron (ω)
3.40°
Angular separation (arcsec)
1.71000
Eq. Temperature
500K
(227 °C)
Insolation (S⊕)
172.86
Earth = 1.00
Earth Similarity (ESI)
0.327
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Radial velocity
Stellar wobble has been measured spectroscopically.
Discovery Paper
Primary reference
Battley et al. 2024Instrument
TESS CCD Array
Publication
2024-04
Observation locale
Space
Discovery cohort
Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: NGTS-30
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,455 K — cooler than the Sun (5,778 K)
Estimated Age
1.10 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.913 R☉
Stellar Mass
0.940 M☉
Metallicity [Fe/H]
-0.03
Extended Stellar Properties
Surface gravity (log g)
4.300 dex
Stellar density
1.458 g/cm³
Rotational v·sin i
3.50 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
4.167 mas
Total Proper Motion
54.891 mas/yr
PM Right Ascension
23.79 mas/yr
PM Declination
-49.47 mas/yr
Galactic Cartesian (pc)
x = -0.904 · y = 0.100 · z = -0.416
Equatorial (J2000)
RA 173.71487° · Dec -24.60548°
Galactic ℓ, b
281.567° · 35.069°
Ecliptic λ, β
184.696° · -24.936°
HTM-20 index
-2018178463
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