Key parameters at a glance
- A radius of 1.54 Earth radii
- A mass of 5.14 Earth masses
- Surface gravity around 2.17 g
- An orbital period of 6.430 days
- Semi-major axis 0.0673 AU
- Equilibrium temperature 920 K (647 °C)
- Distance from Earth 222.41 light-years
- Earth Similarity Index 0.291
- Travel time at Voyager 1 speed 3,922,241 years
2 siblings around TOI-469
HIP 29442 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| HIP 29442 c | Super-Earth | 1.55 | 4.50 | 3.538 | 1,123 | 2023 |
| HIP 29442 d this | Super-Earth | 1.54 | 5.14 | 6.430 | 920 | 2023 |
| TOI-469.01 | Sub-Neptune | 3.41 | 9.10 | 13.631 | 716 | 2021 |
HIP 29442 d Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#683of 1176
top 58.0%
This planet
1.54R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | HIP 29442 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.54 | 11.21 |
| Mass (M⊕) | 1.00 | 5.14 | 317.83 |
| Density (g/cm³) | 5.51 | 11.00 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.17 | 2.53 |
| Insolation (S⊕) | 1.00 | 203.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 5.140 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 42813
HIP
HIP 29442
TIC
TIC 33692729
Gaia DR2
Gaia DR2 2993561629444856960
Gaia DR3
Gaia DR3 2993561629444856960
System
TOI-469
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 6.43 Earth days (1.8% of a terrestrial year) at a mean orbital distance of 0.0673 AU.
Transit Fingerprint
Duration
3.080 h
Impact parameter b
0.443
Rp / R★
0.014400
Transit midpoint (BJD)
2,458,472.9865
Extended Orbital Architecture
Planet / star radius ratio
0.014400
Semi-major axis / stellar radius
14.500
Impact parameter (b)
0.443
RV semi-amplitude (K)
1.910 m/s
Transit mid-time (BJD)
2,458,472.9865
Angular separation (arcsec)
0.98700
Eq. Temperature
920K
(647 °C)
Insolation (S⊕)
203.00
Earth = 1.00
Earth Similarity (ESI)
0.291
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
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
Damasso et al. 2023Instrument
ESPRESSO
Publication
2023-08
Observation locale
Ground
Discovery cohort
Planets confirmed in 2023 at Paranal Observatory (5 shown).
Host System: TOI-469
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,289 K — cooler than the Sun (5,778 K)
Estimated Age
11.20 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.980 R☉
Stellar Mass
0.901 M☉
Metallicity [Fe/H]
0.24
Extended Stellar Properties
Surface gravity (log g)
4.390 dex
Stellar density
1.424 g/cm³
Rotational v·sin i
1.94 km/s
Rotation period
40.00 days
Activity index (log R'HK)
-4.980
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
14.636 mas
Total Proper Motion
180.981 mas/yr
PM Right Ascension
-79.26 mas/yr
PM Declination
162.70 mas/yr
Galactic Cartesian (pc)
x = -0.052 · y = 0.966 · z = -0.253
Equatorial (J2000)
RA 93.05784° · Dec -14.64932°
Galactic ℓ, b
221.872° · -15.183°
Ecliptic λ, β
93.754° · -38.049°
HTM-20 index
-505793275
Similar Worlds
K2-226 b
Super-Earth · G-type yellow (Sun-like)
Radius 1.54 R⊕ · 689.1 ly
Kepler-107 b
Super-Earth · G-type yellow (Sun-like)
Radius 1.54 R⊕ · 1,715.6 ly
Kepler-1287 b
Super-Earth · G-type yellow (Sun-like)
Radius 1.54 R⊕ · 3,272.2 ly
Kepler-337 b
Super-Earth · G-type yellow (Sun-like)
Radius 1.54 R⊕ · 2,211.3 ly
K2-350 b
Super-Earth · G-type yellow (Sun-like)
Radius 1.54 R⊕ · 1,596.1 ly
Kepler-1006 b
Super-Earth · G-type yellow (Sun-like)
Radius 1.54 R⊕ · 3,528.2 ly