Key parameters at a glance
- A radius of 15.65 Earth radii
- A mass of 188.47 Earth masses
- Surface gravity around 0.77 g
- An orbital period of 3.370 days
- Semi-major axis 0.0446 AU
- Equilibrium temperature 1,783 K (1510 °C)
- Distance from Earth 3,072.79 light-years
- Earth Similarity Index 0.057
- Travel time at Voyager 1 speed 54,188,603 years
NGTS-27 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#189of 1771
top 10.6%
This planet
15.65R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | NGTS-27 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 15.65 | 11.21 |
| Mass (M⊕) | 1.00 | 188.47 | 317.83 |
| Density (g/cm³) | 5.51 | 0.27 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.77 | 2.53 |
| Insolation (S⊕) | 1.00 | 1,680.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 188.472 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 305739565
Gaia DR2
Gaia DR2 6171451912217279872
Gaia DR3
Gaia DR3 6171451912217279872
System
NGTS-27
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.37 Earth days (0.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0446 AU.
Transit Fingerprint
Depth
0.561 %
Duration
4.888 h
Rp / R★
0.081000
Transit midpoint (BJD)
2,458,540.6573
Photometric dip
Transit produces a flux drop of 5,610 ppm lasting ≈ 4.89 h.
Extended Orbital Architecture
Planet / star radius ratio
0.081000
Semi-major axis / stellar radius
5.430
RV semi-amplitude (K)
76.500 m/s
Transit mid-time (BJD)
2,458,540.6573
Angular separation (arcsec)
0.04730
Eq. Temperature
1,783K
(1510 °C)
Insolation (S⊕)
1,680.00
Earth = 1.00
Earth Similarity (ESI)
0.057
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
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
Bouchy 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-27
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,700 K — cooler than the Sun (5,778 K)
Estimated Age
7.90 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.770 R☉
Stellar Mass
1.070 M☉
Metallicity [Fe/H]
0.00
Extended Stellar Properties
Surface gravity (log g)
4.050 dex
Stellar density
0.230 g/cm³
Systemic radial velocity
-22.90 km/s
Rotational v·sin i
1.60 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
1.033 mas
Total Proper Motion
20.503 mas/yr
PM Right Ascension
-20.44 mas/yr
PM Declination
1.60 mas/yr
Galactic Cartesian (pc)
x = -0.758 · y = -0.370 · z = -0.538
Equatorial (J2000)
RA 206.02653° · Dec -32.52297°
Galactic ℓ, b
315.623° · 29.047°
Ecliptic λ, β
216.136° · -20.249°
HTM-20 index
-935182415
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