Key parameters at a glance
- A radius of 12.17 Earth radii
- A mass of 251.40 Earth masses
- Surface gravity around 1.70 g
- An orbital period of 2.255 days
- Semi-major axis 0.0352 AU
- Equilibrium temperature 1,715 K (1442 °C)
- Distance from Earth 1,330.19 light-years
- Earth Similarity Index 0.077
- Travel time at Voyager 1 speed 23,457,981 years
TOI-169 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1441of 1771
top 81.3%
This planet
12.17R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-169 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.17 | 11.21 |
| Mass (M⊕) | 1.00 | 251.40 | 317.83 |
| Density (g/cm³) | 5.51 | 0.76 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.70 | 2.53 |
| Insolation (S⊕) | 1.00 | 1,443.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 251.404 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 183120439
Gaia DR2
Gaia DR2 4684513614202233728
Gaia DR3
Gaia DR3 4684513614202233728
System
TOI-169
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.26 Earth days (0.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0352 AU.
Transit Fingerprint
Depth
0.750 %
Duration
1.706 h
Impact parameter b
0.922
Rp / R★
0.086600
Transit midpoint (BJD)
2,458,327.4417
Photometric dip
Transit produces a flux drop of 7,500 ppm lasting ≈ 1.71 h.
Extended Orbital Architecture
Planet / star radius ratio
0.086600
Semi-major axis / stellar radius
5.880
Impact parameter (b)
0.922
RV semi-amplitude (K)
110.500 m/s
Transit mid-time (BJD)
2,458,327.4417
Angular separation (arcsec)
0.08640
Eq. Temperature
1,715K
(1442 °C)
Insolation (S⊕)
1,443.00
Earth = 1.00
Earth Similarity (ESI)
0.077
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
Nielsen 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: TOI-169
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,880 K — hotter than the Sun (5,778 K)
Estimated Age
4.70 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.288 R☉
Stellar Mass
1.147 M☉
Metallicity [Fe/H]
0.24
Extended Stellar Properties
Surface gravity (log g)
4.278 dex
Stellar density
0.756 g/cm³
Systemic radial velocity
43.40 km/s
Rotational v·sin i
2.50 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
2.423 mas
Total Proper Motion
25.546 mas/yr
PM Right Ascension
20.22 mas/yr
PM Declination
-15.61 mas/yr
Galactic Cartesian (pc)
x = 0.245 · y = 0.074 · z = -0.967
Equatorial (J2000)
RA 16.77869° · Dec -75.19895°
Galactic ℓ, b
301.588° · -41.888°
Ecliptic λ, β
307.656° · -66.402°
HTM-20 index
675097854
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