Key parameters at a glance
- A radius of 3.24 Earth radii
- A mass of 10.59 Earth masses
- Surface gravity around 1.01 g
- An orbital period of 151.920 days
- Semi-major axis 0.4894 AU
- Equilibrium temperature 349 K (76 °C)
- Distance from Earth 55.13 light-years
- Earth Similarity Index 0.602
- Travel time at Voyager 1 speed 972,295 years
2 siblings around HD 48948
HD 48948 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 |
|---|---|---|---|---|---|---|
| HD 48948 b | Sub-Neptune | 2.06 | 4.88 | 7.340 | 957 | 2024 |
| HD 48948 c | Sub-Neptune | 2.60 | 7.27 | 38.060 | 553 | 2024 |
| HD 48948 d this | Sub-Neptune | 3.24 | 10.59 | 151.920 | 349 | 2024 |
HD 48948 d Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#320of 1978
top 16.1%
This planet
3.24R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | HD 48948 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.24 | 11.21 |
| Mass (M⊕) | 1.00 | 10.59 | 317.83 |
| Density (g/cm³) | 5.51 | 1.71 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.01 | 2.53 |
| Insolation (S⊕) | 1.00 | 2.46 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 10.590 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 48948
HIP
HIP 32769
TIC
TIC 88228576
Gaia DR2
Gaia DR2 1003351437484254464
Gaia DR3
Gaia DR3 1003351437484254464
System
HD 48948
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 151.92 Earth days (41.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.4894 AU.
Extended Orbital Architecture
Semi-major axis / stellar radius
154.970
RV semi-amplitude (K)
1.550 m/s
Long. of periastron (ω)
269.00°
Angular separation (arcsec)
29.00000
Eq. Temperature
349K
(76 °C)
Insolation (S⊕)
2.46
Earth = 1.00
Earth Similarity (ESI)
0.602
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure.
Discovery Paper
Primary reference
Dalal et al. 2024Instrument
HARPS-N Spectrograph
Publication
2024-07
Observation locale
Ground
Discovery cohort
Planets confirmed in 2024 at Roque de los Muchachos Observatory (2 shown).
Host System: HD 48948
Spectral Class
K-type orange
Effective Temperature
4,593 K — cooler than the Sun (5,778 K)
Estimated Age
11.48 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.679 R☉
Stellar Mass
0.686 M☉
Metallicity [Fe/H]
-0.21
Extended Stellar Properties
Surface gravity (log g)
4.610 dex
Stellar density
3.073 g/cm³
Systemic radial velocity
-53.00 km/s
Rotational v·sin i
2.00 km/s
Rotation period
43.45 days
Activity index (log R'HK)
-4.915
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 7 bands
Astrometric Data
Parallax
59.128 mas
Total Proper Motion
482.492 mas/yr
PM Right Ascension
253.25 mas/yr
PM Declination
410.69 mas/yr
Galactic Cartesian (pc)
x = -0.107 · y = 0.483 · z = 0.869
Equatorial (J2000)
RA 102.48981° · Dec 60.33731°
Galactic ℓ, b
155.499° · 23.165°
Ecliptic λ, β
97.722° · 37.233°
HTM-20 index
1077153194
Similar Worlds
Kepler-742 b
Sub-Neptune · K-type orange
Radius 3.24 R⊕ · 1,595.7 ly
HD 20781 d
Sub-Neptune · K-type orange
Radius 3.25 R⊕ · 117.3 ly
TOI-2093 b
Sub-Neptune · K-type orange
Radius 3.25 R⊕ · 270.1 ly
TOI-5704 b
Sub-Neptune · K-type orange
Radius 3.23 R⊕ · 292.4 ly
Kepler-287 c
Sub-Neptune · K-type orange
Radius 3.26 R⊕ · 2,726.2 ly
Kepler-472 b
Sub-Neptune · K-type orange
Radius 3.22 R⊕ · 1,000.0 ly