Key parameters at a glance
- A radius of 2.88 Earth radii
- A mass of 10.48 Earth masses
- Surface gravity around 1.26 g
- An orbital period of 15.611 days
- Semi-major axis 0.1310 AU
- Equilibrium temperature 911 K (638 °C)
- Distance from Earth 115.00 light-years
- Earth Similarity Index 0.269
- Travel time at Voyager 1 speed 2,028,071 years
2 siblings around HD 73344
HD 73344 b 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 |
|---|---|---|---|---|---|---|
| HD 73344 b this | Sub-Neptune | 2.88 | 10.48 | 15.611 | 911 | 2024 |
| HD 73344 c | Gas Giant | 13.50 | 118.55 | 65.940 | — | 2025 |
| HD 73344 d | Gas Giant | 13.20 | 810.46 | 5,823.000 | — | 2025 |
HD 73344 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#649of 1978
top 32.8%
This planet
2.88R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | HD 73344 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.88 | 11.21 |
| Mass (M⊕) | 1.00 | 10.48 | 317.83 |
| Density (g/cm³) | 5.51 | 2.45 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.26 | 2.53 |
| Insolation (S⊕) | 1.00 | 111.97 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 10.480 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 73344
HIP
HIP 42403
TIC
TIC 175193677
Gaia DR2
Gaia DR2 666427539629086976
Gaia DR3
Gaia DR3 666427539629086976
System
HD 73344
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 15.61 Earth days (4.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1310 AU.
Transit Fingerprint
Depth
0.052 %
Duration
3.304 h
Impact parameter b
0.783
Rp / R★
0.022170
Transit midpoint (BJD)
2,458,095.9000
Photometric dip
Transit produces a flux drop of 521 ppm lasting ≈ 3.30 h.
Extended Orbital Architecture
Planet / star radius ratio
0.022170
Semi-major axis / stellar radius
23.556
Impact parameter (b)
0.783
RV semi-amplitude (K)
2.340 m/s
Transit mid-time (BJD)
2,458,095.9000
Long. of periastron (ω)
153.89°
Angular separation (arcsec)
3.72000
Eq. Temperature
911K
(638 °C)
Insolation (S⊕)
111.97
Earth = 1.00
Earth Similarity (ESI)
0.269
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
Discovery Paper
Primary reference
Sulis et al. 2024Instrument
Kepler CCD Array
Publication
2024-05
Observation locale
Space
Host System: HD 73344
Spectral Class
F-type yellow-white
Effective Temperature
6,253 K — hotter than the Sun (5,778 K)
Estimated Age
1.15 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.220 R☉
Stellar Mass
1.200 M☉
Metallicity [Fe/H]
0.14
Extended Stellar Properties
Surface gravity (log g)
4.372 dex
Stellar density
1.014 g/cm³
Systemic radial velocity
5.80 km/s
Rotational v·sin i
5.30 km/s
Rotation period
9.09 days
Activity index (log R'HK)
-4.600
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
28.332 mas
Total Proper Motion
156.117 mas/yr
PM Right Ascension
-47.30 mas/yr
PM Declination
-148.78 mas/yr
Galactic Cartesian (pc)
x = -0.585 · y = 0.705 · z = 0.402
Equatorial (J2000)
RA 129.68945° · Dec 23.68527°
Galactic ℓ, b
201.244° · 33.438°
Ecliptic λ, β
125.949° · 5.063°
HTM-20 index
-463656631
Similar Worlds
Kepler-1666 b
Sub-Neptune · F-type yellow-white
Radius 2.88 R⊕ · 4,498.9 ly
Kepler-1723 b
Sub-Neptune · F-type yellow-white
Radius 2.88 R⊕ · 2,646.0 ly
KOI-351 f
Sub-Neptune · F-type yellow-white
Radius 2.88 R⊕ · 2,766.6 ly
Kepler-805 b
Sub-Neptune · F-type yellow-white
Radius 2.89 R⊕ · 2,082.5 ly
Kepler-1921 b
Sub-Neptune · F-type yellow-white
Radius 2.89 R⊕ · 3,030.0 ly
HD 77946 b
Sub-Neptune · F-type yellow-white
Radius 2.90 R⊕ · 324.4 ly