Key parameters at a glance
- A radius of 1.63 Earth radii
- A mass of 4.07 Earth masses
- Surface gravity around 1.53 g
- An orbital period of 1.402 days
- Semi-major axis 0.0208 AU
- Equilibrium temperature 998 K (725 °C)
- Distance from Earth 82.03 light-years
- Earth Similarity Index 0.297
- Travel time at Voyager 1 speed 1,446,545 years
- Almost certainly tidally locked to its host star given the close orbit
L 168-9 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#517of 1176
top 43.9%
This planet
1.63R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | L 168-9 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.63 | 11.21 |
| Mass (M⊕) | 1.00 | 4.07 | 317.83 |
| Density (g/cm³) | 5.51 | 5.18 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.53 | 2.53 |
| Insolation (S⊕) | 1.00 | 149.37 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 4.070 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HIP
HIP 115211
TIC
TIC 234994474
Gaia DR2
Gaia DR2 6491962296196145664
Gaia DR3
Gaia DR3 6491962300492857472
System
L 168-9
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 1.40 Earth days (0.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0208 AU.
Transit Fingerprint
Depth
0.059 %
Duration
1.020 h
Impact parameter b
0.740
Rp / R★
0.024700
Transit midpoint (BJD)
2,459,082.8568
Photometric dip
Transit produces a flux drop of 594 ppm lasting ≈ 1.02 h.
Extended Orbital Architecture
Planet / star radius ratio
0.024700
Semi-major axis / stellar radius
8.610
Impact parameter (b)
0.740
RV semi-amplitude (K)
3.200 m/s
Transit mid-time (BJD)
2,459,082.8568
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
0.82700
Eq. Temperature
998K
(725 °C)
Insolation (S⊕)
149.37
Earth = 1.00
Earth Similarity (ESI)
0.297
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
Astudillo Defru et al. 2020Instrument
TESS CCD Array
Publication
2020-04
Observation locale
Space
Discovery cohort
Planets confirmed in 2020 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: L 168-9
Spectral Class
M-type red dwarf
Effective Temperature
3,842 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.604 R☉
Stellar Mass
0.614 M☉
Metallicity [Fe/H]
-0.03
Extended Stellar Properties
Surface gravity (log g)
4.840 dex
Stellar density
3.880 g/cm³
Systemic radial velocity
3.22 km/s
Rotation period
29.00 days
Activity index (log R'HK)
-4.768
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 15 bands
Astrometric Data
Parallax
39.733 mas
Total Proper Motion
344.533 mas/yr
PM Right Ascension
-319.96 mas/yr
PM Declination
-127.78 mas/yr
Galactic Cartesian (pc)
x = 0.491 · y = -0.086 · z = -0.867
Equatorial (J2000)
RA 350.02859° · Dec -60.06573°
Galactic ℓ, b
321.956° · -53.559°
Ecliptic λ, β
319.212° · -49.528°
HTM-20 index
1337395039
Similar Worlds
GJ 3293 e
Super-Earth · M-type red dwarf
Radius 1.63 R⊕ · 65.9 ly
L 98-59 d
Super-Earth · M-type red dwarf
Radius 1.63 R⊕ · 34.6 ly
K2-149 b
Super-Earth · M-type red dwarf
Radius 1.64 R⊕ · 403.4 ly
Kepler-205 c
Super-Earth · M-type red dwarf
Radius 1.64 R⊕ · 520.9 ly
TOI-6002 b
Super-Earth · M-type red dwarf
Radius 1.65 R⊕ · 104.5 ly
Kepler-296 b
Super-Earth · M-type red dwarf
Radius 1.61 R⊕ · 544.7 ly