Key parameters at a glance
- A radius of 9.16 Earth radii
- A mass of 109.33 Earth masses
- Surface gravity around 1.30 g
- An orbital period of 35.455 days
- Semi-major axis 0.2010 AU
- Equilibrium temperature 435 K (162 °C)
- Distance from Earth 621.07 light-years
- Earth Similarity Index 0.346
- Travel time at Voyager 1 speed 10,952,618 years
- Almost certainly tidally locked to its host star given the close orbit
NGTS-11 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#75of 574
top 12.9%
This planet
9.16R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | NGTS-11 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 9.16 | 11.21 |
| Mass (M⊕) | 1.00 | 109.33 | 317.83 |
| Density (g/cm³) | 5.51 | 0.78 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.30 | 2.53 |
| Insolation (S⊕) | 1.00 | 9.24 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 109.334 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 54002556
Gaia DR2
Gaia DR2 2453680078509741056
Gaia DR3
Gaia DR3 2453680078509741056
System
NGTS-11
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 35.46 Earth days (9.7% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.2010 AU.
Transit Fingerprint
Depth
0.989 %
Duration
3.590 h
Impact parameter b
0.810
Rp / R★
0.101000
Transit midpoint (BJD)
2,458,390.7043
Photometric dip
Transit produces a flux drop of 9,890 ppm lasting ≈ 3.59 h.
Extended Orbital Architecture
Planet / star radius ratio
0.101000
Semi-major axis / stellar radius
54.600
Impact parameter (b)
0.810
RV semi-amplitude (K)
21.200 m/s
Transit mid-time (BJD)
2,458,390.7043
Long. of periastron (ω)
32.00°
Angular separation (arcsec)
1.06000
Eq. Temperature
435K
(162 °C)
Insolation (S⊕)
9.24
Earth = 1.00
Earth Similarity (ESI)
0.346
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
Gill et al. 2020Instrument
TESS CCD Array
Publication
2020-07
Observation locale
Space
Discovery cohort
Planets confirmed in 2020 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: NGTS-11
Spectral Class
K-type orange
Effective Temperature
5,050 K — cooler than the Sun (5,778 K)
Estimated Age
3.90 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.832 R☉
Stellar Mass
0.862 M☉
Metallicity [Fe/H]
0.22
Extended Stellar Properties
Surface gravity (log g)
4.500 dex
Stellar density
2.109 g/cm³
Systemic radial velocity
21.41 km/s
Rotational v·sin i
1.10 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 14 bands
Astrometric Data
Parallax
5.223 mas
Total Proper Motion
17.946 mas/yr
PM Right Ascension
11.17 mas/yr
PM Declination
14.05 mas/yr
Galactic Cartesian (pc)
x = 0.888 · y = 0.387 · z = -0.249
Equatorial (J2000)
RA 23.52145° · Dec -14.41915°
Galactic ℓ, b
163.087° · -73.867°
Ecliptic λ, β
16.052° · -22.471°
HTM-20 index
849631653
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