Key parameters at a glance
- A radius of 12.73 Earth radii
- A mass of 72.78 Earth masses
- Surface gravity around 0.45 g
- An orbital period of 3.357 days
- Semi-major axis 0.0382 AU
- Equilibrium temperature 952 K (679 °C)
- Distance from Earth 1,000.58 light-years
- Earth Similarity Index 0.116
- Travel time at Voyager 1 speed 17,645,194 years
- Almost certainly tidally locked to its host star given the close orbit
NGTS-5 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1125of 1771
top 63.5%
This planet
12.73R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | NGTS-5 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.73 | 11.21 |
| Mass (M⊕) | 1.00 | 72.78 | 317.83 |
| Density (g/cm³) | 5.51 | 0.19 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.45 | 2.53 |
| Insolation (S⊕) | 1.00 | 101.25 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 72.783 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 368739874
Gaia DR2
Gaia DR2 1159042833731813760
Gaia DR3
Gaia DR3 1159042833731813760
System
NGTS-5
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.36 Earth days (0.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0382 AU.
Transit Fingerprint
Depth
2.624 %
Duration
2.210 h
Rp / R★
0.157900
Transit midpoint (BJD)
2,457,740.3526
Photometric dip
Transit produces a flux drop of 26,240 ppm lasting ≈ 2.21 h.
Extended Orbital Architecture
Planet / star radius ratio
0.157900
Semi-major axis / stellar radius
11.111
RV semi-amplitude (K)
41.000 m/s
Transit mid-time (BJD)
2,457,740.3526
Angular separation (arcsec)
0.12500
Eq. Temperature
952K
(679 °C)
Insolation (S⊕)
101.25
Earth = 1.00
Earth Similarity (ESI)
0.116
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
Eigm Uuml Ller et al. 2019Instrument
NGTS CCD array
Publication
2019-05
Observation locale
Ground
Discovery cohort
Planets confirmed in 2019 at Next-Generation Transit Survey (NGTS) (4 shown).
Host System: NGTS-5
Spectral Class
K-type orange
Effective Temperature
4,987 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.739 R☉
Stellar Mass
0.661 M☉
Metallicity [Fe/H]
0.12
Extended Stellar Properties
Surface gravity (log g)
4.520 dex
Stellar density
2.812 g/cm³
Systemic radial velocity
-5.52 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
3.231 mas
Total Proper Motion
14.433 mas/yr
PM Right Ascension
13.65 mas/yr
PM Declination
-4.69 mas/yr
Galactic Cartesian (pc)
x = -0.750 · y = -0.654 · z = 0.098
Equatorial (J2000)
RA 221.05827° · Dec 5.60537°
Galactic ℓ, b
359.284° · 55.603°
Ecliptic λ, β
216.771° · 20.465°
HTM-20 index
-2120232660
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