Key parameters at a glance
- A radius of 1.55 Earth radii
- A mass of 4.50 Earth masses
- Surface gravity around 1.87 g
- An orbital period of 3.538 days
- Semi-major axis 0.0452 AU
- Equilibrium temperature 1,123 K (850 °C)
- Distance from Earth 222.41 light-years
- Earth Similarity Index 0.258
- Travel time at Voyager 1 speed 3,922,241 years
2 siblings around TOI-469
HIP 29442 c 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 this | Super-Earth | 1.55 | 4.50 | 3.538 | 1,123 | 2023 |
| HIP 29442 d | 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 c Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#650of 1176
top 55.2%
This planet
1.55R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | HIP 29442 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.55 | 11.21 |
| Mass (M⊕) | 1.00 | 4.50 | 317.83 |
| Density (g/cm³) | 5.51 | 6.30 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.87 | 2.53 |
| Insolation (S⊕) | 1.00 | 451.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 4.500 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 3.54 Earth days (1.0% of a terrestrial year) at a mean orbital distance of 0.0452 AU.
Transit Fingerprint
Duration
2.429 h
Impact parameter b
0.514
Rp / R★
0.014530
Transit midpoint (BJD)
2,458,471.3600
Extended Orbital Architecture
Planet / star radius ratio
0.014530
Semi-major axis / stellar radius
9.720
Impact parameter (b)
0.514
RV semi-amplitude (K)
2.040 m/s
Transit mid-time (BJD)
2,458,471.3600
Angular separation (arcsec)
0.66300
Eq. Temperature
1,123K
(850 °C)
Insolation (S⊕)
451.00
Earth = 1.00
Earth Similarity (ESI)
0.258
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
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
Kepler-226 b
Super-Earth · G-type yellow (Sun-like)
Radius 1.55 R⊕ · 3,196.8 ly
Kepler-1466 b
Super-Earth · G-type yellow (Sun-like)
Radius 1.55 R⊕ · 2,061.1 ly
Kepler-255 b
Super-Earth · G-type yellow (Sun-like)
Radius 1.55 R⊕ · 3,432.9 ly
Kepler-1295 b
Super-Earth · G-type yellow (Sun-like)
Radius 1.55 R⊕ · 3,830.6 ly
Kepler-784 c
Super-Earth · G-type yellow (Sun-like)
Radius 1.55 R⊕ · 4,252.2 ly
Kepler-195 c
Super-Earth · G-type yellow (Sun-like)
Radius 1.55 R⊕ · 2,126.7 ly