Key parameters at a glance
- A radius of 1.93 Earth radii
- A mass of 9.67 Earth masses
- Surface gravity around 2.60 g
- An orbital period of 2.797 days
- Semi-major axis 0.0380 AU
- Equilibrium temperature 1,256 K (983 °C)
- Distance from Earth 210.70 light-years
- Earth Similarity Index 0.211
- Travel time at Voyager 1 speed 3,715,620 years
TOI-784 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#85of 1176
top 7.1%
This planet
1.93R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | TOI-784 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.93 | 11.21 |
| Mass (M⊕) | 1.00 | 9.67 | 317.83 |
| Density (g/cm³) | 5.51 | 7.40 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.60 | 2.53 |
| Insolation (S⊕) | 1.00 | 413.89 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 9.670 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 307842
TIC
TIC 460984940
Gaia DR2
Gaia DR2 5251941573573934080
Gaia DR3
Gaia DR3 5251941573573934080
System
HD 307842
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.80 Earth days (0.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0380 AU.
Transit Fingerprint
Depth
0.048 %
Duration
2.185 h
Impact parameter b
0.220
Rp / R★
0.019500
Transit midpoint (BJD)
2,459,336.6122
Photometric dip
Transit produces a flux drop of 481 ppm lasting ≈ 2.19 h.
Extended Orbital Architecture
Planet / star radius ratio
0.019500
Semi-major axis / stellar radius
9.030
Impact parameter (b)
0.220
RV semi-amplitude (K)
4.670 m/s
Transit mid-time (BJD)
2,459,336.6122
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
0.58800
Eq. Temperature
1,256K
(983 °C)
Insolation (S⊕)
413.89
Earth = 1.00
Earth Similarity (ESI)
0.211
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
Hua et al. 2023Instrument
TESS CCD Array
Publication
2023-07
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: HD 307842
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,558 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.907 R☉
Stellar Mass
0.910 M☉
Metallicity [Fe/H]
-0.13
Extended Stellar Properties
Surface gravity (log g)
4.480 dex
Stellar density
1.781 g/cm³
Systemic radial velocity
15.06 km/s
Rotational v·sin i
1.10 km/s
Activity index (log R'HK)
-4.990
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
15.451 mas
Total Proper Motion
154.952 mas/yr
PM Right Ascension
3.57 mas/yr
PM Declination
-154.91 mas/yr
Galactic Cartesian (pc)
x = -0.415 · y = 0.157 · z = -0.896
Equatorial (J2000)
RA 159.34122° · Dec -63.65569°
Galactic ℓ, b
288.701° · -4.552°
Ecliptic λ, β
207.133° · -62.187°
HTM-20 index
-372064616
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