Key parameters at a glance
- A radius of 14.91 Earth radii
- A mass of 258.08 Earth masses
- Surface gravity around 1.16 g
- An orbital period of 2.647 days
- Semi-major axis 0.0326 AU
- Equilibrium temperature 790 K (517 °C)
- Distance from Earth 711.41 light-years
- Earth Similarity Index 0.156
- Travel time at Voyager 1 speed 12,545,798 years
- Almost certainly tidally locked to its host star given the close orbit
NGTS-1 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#237of 1771
top 13.3%
This planet
14.91R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | NGTS-1 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 14.91 | 11.21 |
| Mass (M⊕) | 1.00 | 258.08 | 317.83 |
| Density (g/cm³) | 5.51 | 0.42 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.16 | 2.53 |
| Insolation (S⊕) | 1.00 | 65.30 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 258.078 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 192826603
Gaia DR2
Gaia DR2 4821739369794767744
Gaia DR3
Gaia DR3 4821739369794767744
System
NGTS-1
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.65 Earth days (0.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0326 AU.
Transit Fingerprint
Depth
2.137 %
Duration
1.230 h
Impact parameter b
0.995
Rp / R★
0.239000
Transit midpoint (BJD)
2,457,720.6594
Photometric dip
Transit produces a flux drop of 21,368 ppm lasting ≈ 1.23 h.
Extended Orbital Architecture
Planet / star radius ratio
0.239000
Semi-major axis / stellar radius
12.200
Impact parameter (b)
0.995
RV semi-amplitude (K)
166.000 m/s
Transit mid-time (BJD)
2,457,720.6594
Angular separation (arcsec)
0.14900
Eq. Temperature
790K
(517 °C)
Insolation (S⊕)
65.30
Earth = 1.00
Earth Similarity (ESI)
0.156
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. 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
Bayliss et al. 2018Instrument
NGTS CCD array
Publication
2018-04
Observation locale
Ground
Host System: NGTS-1
Spectral Class
M-type red dwarf
Effective Temperature
3,916 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.573 R☉
Stellar Mass
0.617 M☉
Metallicity [Fe/H]
0.00
Extended Stellar Properties
Surface gravity (log g)
4.710 dex
Stellar density
4.400 g/cm³
Systemic radial velocity
97.18 km/s
Rotational v·sin i
1.00 km/s
Metallicity ratio
[M/H]
Multi-band Host Photometry — 14 bands
Astrometric Data
Parallax
4.556 mas
Total Proper Motion
51.969 mas/yr
PM Right Ascension
-31.90 mas/yr
PM Declination
-41.03 mas/yr
Galactic Cartesian (pc)
x = 0.102 · y = 0.796 · z = -0.597
Equatorial (J2000)
RA 82.71421° · Dec -36.63098°
Galactic ℓ, b
241.192° · -31.201°
Ecliptic λ, β
78.332° · -59.776°
HTM-20 index
466939514
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