Key parameters at a glance
- A radius of 14.86 Earth radii
- A mass of 425.57 Earth masses
- Surface gravity around 1.93 g
- An orbital period of 0.882 days
- Semi-major axis 0.0168 AU
- Equilibrium temperature 1,284 K (1011 °C)
- Distance from Earth 1,005.42 light-years
- Earth Similarity Index 0.101
- Travel time at Voyager 1 speed 17,730,493 years
- Almost certainly tidally locked to its host star given the close orbit
NGTS-6 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#247of 1771
top 13.9%
This planet
14.86R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | NGTS-6 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 14.86 | 11.21 |
| Mass (M⊕) | 1.00 | 425.57 | 317.83 |
| Density (g/cm³) | 5.51 | 0.71 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.93 | 2.53 |
| Insolation (S⊕) | 1.00 | 983.42 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 425.574 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 1528696
Gaia DR2
Gaia DR2 4875693023844840448
Gaia DR3
Gaia DR3 4875693023844840448
System
NGTS-6
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts roughly 21.2 hours long on a nearly circular orbit at a mean orbital distance of 0.0168 AU.
Transit Fingerprint
Depth
1.176 %
Duration
0.576 h
Impact parameter b
0.976
Rp / R★
0.180000
Transit midpoint (BJD)
2,457,982.3784
Photometric dip
Transit produces a flux drop of 11,756 ppm lasting ≈ 0.58 h.
Extended Orbital Architecture
Planet / star radius ratio
0.180000
Semi-major axis / stellar radius
4.784
Impact parameter (b)
0.976
RV semi-amplitude (K)
322.000 m/s
Transit mid-time (BJD)
2,457,982.3784
Angular separation (arcsec)
0.05440
Eq. Temperature
1,284K
(1011 °C)
Insolation (S⊕)
983.42
Earth = 1.00
Earth Similarity (ESI)
0.101
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
Vines et al. 2019Instrument
NGTS CCD array
Publication
2019-11
Observation locale
Ground
Discovery cohort
Planets confirmed in 2019 at Next-Generation Transit Survey (NGTS) (4 shown).
Host System: NGTS-6
Spectral Class
K-type orange
Effective Temperature
4,730 K — cooler than the Sun (5,778 K)
Estimated Age
9.77 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.754 R☉
Stellar Mass
0.767 M☉
Metallicity [Fe/H]
0.11
Extended Stellar Properties
Surface gravity (log g)
4.700 dex
Stellar density
3.930 g/cm³
Systemic radial velocity
-19.14 km/s
Rotational v·sin i
2.85 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 14 bands
Astrometric Data
Parallax
3.215 mas
Total Proper Motion
23.895 mas/yr
PM Right Ascension
-9.34 mas/yr
PM Declination
-22.00 mas/yr
Galactic Cartesian (pc)
x = 0.212 · y = 0.836 · z = -0.506
Equatorial (J2000)
RA 75.79538° · Dec -30.39946°
Galactic ℓ, b
232.394° · -35.451°
Ecliptic λ, β
69.489° · -52.832°
HTM-20 index
1227781430
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