Key parameters at a glance
- A radius of 11.10 Earth radii
- A mass of 212.95 Earth masses
- Surface gravity around 1.73 g
- An orbital period of 29.090 days
- Semi-major axis 0.1525 AU
- Equilibrium temperature 378 K (105 °C)
- Distance from Earth 418.91 light-years
- Earth Similarity Index 0.373
- Travel time at Voyager 1 speed 7,387,446 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-1899 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1656of 1771
top 93.5%
This planet
11.10R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-1899 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 11.10 | 11.21 |
| Mass (M⊕) | 1.00 | 212.95 | 317.83 |
| Density (g/cm³) | 5.51 | 0.85 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.73 | 2.53 |
| Insolation (S⊕) | 1.00 | 3.40 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 212.945 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 172370679
Gaia DR2
Gaia DR2 2073530190996615424
Gaia DR3
Gaia DR3 2073530190996615424
System
TOI-1899
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 29.09 Earth days (8.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1525 AU.
Transit Fingerprint
Depth
3.756 %
Duration
4.700 h
Impact parameter b
0.350
Rp / R★
0.168000
Transit midpoint (BJD)
2,458,711.9592
Photometric dip
Transit produces a flux drop of 37,562 ppm lasting ≈ 4.70 h.
Extended Orbital Architecture
Planet / star radius ratio
0.168000
Semi-major axis / stellar radius
54.010
Impact parameter (b)
0.350
RV semi-amplitude (K)
59.820 m/s
Transit mid-time (BJD)
2,458,711.9592
Long. of periastron (ω)
-53.00°
Angular separation (arcsec)
1.19000
Eq. Temperature
378K
(105 °C)
Insolation (S⊕)
3.40
Earth = 1.00
Earth Similarity (ESI)
0.373
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
Ca Ntilde As et al. 2020Instrument
TESS CCD Array
Publication
2020-09
Observation locale
Space
Discovery cohort
Planets confirmed in 2020 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-1899
Spectral Class
M-type red dwarf
Effective Temperature
3,926 K — cooler than the Sun (5,778 K)
Estimated Age
7.10 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.607 R☉
Stellar Mass
0.632 M☉
Metallicity [Fe/H]
0.28
Extended Stellar Properties
Surface gravity (log g)
4.672 dex
Stellar density
3.980 g/cm³
Systemic radial velocity
-28.95 km/s
Rotational v·sin i
2.00 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 13 bands
Astrometric Data
Parallax
7.757 mas
Total Proper Motion
40.119 mas/yr
PM Right Ascension
35.43 mas/yr
PM Declination
18.83 mas/yr
Galactic Cartesian (pc)
x = 0.376 · y = -0.666 · z = 0.645
Equatorial (J2000)
RA 299.42685° · Dec 40.14335°
Galactic ℓ, b
75.507° · 5.738°
Ecliptic λ, β
316.656° · 58.909°
HTM-20 index
690160687
Similar Worlds
TOI-5007 b
Gas Giant · M-type red dwarf
Radius 11.07 R⊕ · 663.2 ly
HATS-6 b
Gas Giant · M-type red dwarf
Radius 11.19 R⊕ · 552.2 ly
2MASS J01225093-2439505 b
Gas Giant · M-type red dwarf
Radius 11.21 R⊕ · 110.3 ly
TOI-6383 A b
Gas Giant · M-type red dwarf
Radius 11.29 R⊕ · 558.8 ly
TOI-6330 b
Gas Giant · M-type red dwarf
Radius 10.89 R⊕ · 453.5 ly
TOI-3714 b
Gas Giant · M-type red dwarf
Radius 11.32 R⊕ · 367.6 ly