Key parameters at a glance
- A radius of 3.64 Earth radii
- A mass of 41.80 Earth masses
- Surface gravity around 3.15 g
- An orbital period of 0.766 days
- Semi-major axis 0.0155 AU
- Equilibrium temperature 1,932 K (1659 °C)
- Distance from Earth 736.24 light-years
- Earth Similarity Index 0.117
- Travel time at Voyager 1 speed 12,983,680 years
TOI-849 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#120of 1978
top 6.0%
This planet
3.64R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-849 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.64 | 11.21 |
| Mass (M⊕) | 1.00 | 41.80 | 317.83 |
| Density (g/cm³) | 5.51 | 5.60 | 1.33 |
| Surface Gravity (g) | 1.00 | 3.15 | 2.53 |
| Insolation (S⊕) | 1.00 | 2,314.06 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 41.800 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 33595516
Gaia DR2
Gaia DR2 5023809953208388352
Gaia DR3
Gaia DR3 5023809953208388352
System
TOI-849
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts roughly 18.4 hours long on a nearly circular orbit at a mean orbital distance of 0.0155 AU.
Transit Fingerprint
Depth
0.141 %
Duration
1.570 h
Impact parameter b
0.210
Rp / R★
0.034400
Transit midpoint (BJD)
2,458,871.6812
Photometric dip
Transit produces a flux drop of 1,410 ppm lasting ≈ 1.57 h.
Extended Orbital Architecture
Planet / star radius ratio
0.034400
Semi-major axis / stellar radius
3.700
Impact parameter (b)
0.210
RV semi-amplitude (K)
29.700 m/s
Transit mid-time (BJD)
2,458,871.6812
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
0.06870
Eq. Temperature
1,932K
(1659 °C)
Insolation (S⊕)
2,314.06
Earth = 1.00
Earth Similarity (ESI)
0.117
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
Armstrong 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-849
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,257 K — cooler than the Sun (5,778 K)
Estimated Age
6.70 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.970 R☉
Stellar Mass
0.970 M☉
Metallicity [Fe/H]
0.19
Extended Stellar Properties
Surface gravity (log g)
4.480 dex
Stellar density
1.685 g/cm³
Systemic radial velocity
9.35 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
4.401 mas
Total Proper Motion
76.171 mas/yr
PM Right Ascension
73.31 mas/yr
PM Declination
20.66 mas/yr
Galactic Cartesian (pc)
x = 0.764 · y = 0.418 · z = -0.491
Equatorial (J2000)
RA 28.71580° · Dec -29.42171°
Galactic ℓ, b
225.975° · -75.860°
Ecliptic λ, β
13.862° · -38.110°
HTM-20 index
1716025685
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