Key parameters at a glance
- A radius of 4.98 Earth radii
- A mass of 29.24 Earth masses
- Surface gravity around 1.18 g
- An orbital period of 3.536 days
- Semi-major axis 0.0403 AU
- Equilibrium temperature 1,143 K (870 °C)
- Distance from Earth 1,050.71 light-years
- Earth Similarity Index 0.172
- Travel time at Voyager 1 speed 18,529,182 years
- Almost certainly tidally locked to its host star given the close orbit
NGTS-14 A b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#384of 574
top 66.7%
This planet
4.98R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | NGTS-14 A b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 4.98 | 11.21 |
| Mass (M⊕) | 1.00 | 29.24 | 317.83 |
| Density (g/cm³) | 5.51 | 1.40 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.18 | 2.53 |
| Insolation (S⊕) | 1.00 | 191.78 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 29.240 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 197643976
Gaia DR2
Gaia DR2 6585082036193768832
Gaia DR3
Gaia DR3 6585082036193768832
System
NGTS-14
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.54 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0403 AU.
Transit Fingerprint
Depth
0.312 %
Duration
2.240 h
Impact parameter b
0.590
Rp / R★
0.053000
Transit midpoint (BJD)
2,457,502.5545
Photometric dip
Transit produces a flux drop of 3,116 ppm lasting ≈ 2.24 h.
Extended Orbital Architecture
Planet / star radius ratio
0.053000
Semi-major axis / stellar radius
10.300
Impact parameter (b)
0.590
RV semi-amplitude (K)
13.200 m/s
Transit mid-time (BJD)
2,457,502.5545
Angular separation (arcsec)
0.12500
Eq. Temperature
1,143K
(870 °C)
Insolation (S⊕)
191.78
Earth = 1.00
Earth Similarity (ESI)
0.172
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. Close-orbiting tidally-locked around a cool host.
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
Smith et al. 2021Instrument
NGTS CCD array
Publication
2021-02
Observation locale
Ground
Discovery cohort
Planets confirmed in 2021 at Next-Generation Transit Survey (NGTS) (5 shown).
Host System: NGTS-14 A
Spectral Class
K-type orange
Effective Temperature
5,187 K — cooler than the Sun (5,778 K)
Estimated Age
5.90 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.842 R☉
Stellar Mass
0.898 M☉
Metallicity [Fe/H]
0.10
Extended Stellar Properties
Surface gravity (log g)
4.200 dex
Stellar density
2.001 g/cm³
Systemic radial velocity
30.29 km/s
Rotational v·sin i
1.20 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 14 bands
Astrometric Data
Parallax
3.076 mas
Total Proper Motion
24.290 mas/yr
PM Right Ascension
-23.66 mas/yr
PM Declination
5.49 mas/yr
Galactic Cartesian (pc)
x = 0.669 · y = -0.409 · z = -0.621
Equatorial (J2000)
RA 328.51748° · Dec -38.37742°
Galactic ℓ, b
4.481° · -51.451°
Ecliptic λ, β
317.035° · -24.001°
HTM-20 index
1012487666
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