Key parameters at a glance
- A radius of 2.86 Earth radii
- A mass of 6.10 Earth masses
- Surface gravity around 0.75 g
- An orbital period of 15.923 days
- Semi-major axis 0.1247 AU
- Equilibrium temperature 751 K (478 °C)
- Distance from Earth 240.94 light-years
- Earth Similarity Index 0.327
- Travel time at Voyager 1 speed 4,248,900 years
HD 135694 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#682of 1978
top 34.4%
This planet
2.86R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | HD 135694 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.86 | 11.21 |
| Mass (M⊕) | 1.00 | 6.10 | 317.83 |
| Density (g/cm³) | 5.51 | 2.05 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.75 | 2.53 |
| Insolation (S⊕) | 1.00 | 71.80 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 6.100 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 135694
HIP
HIP 74326
TIC
TIC 232540264
Gaia DR2
Gaia DR2 1696831425624356480
Gaia DR3
Gaia DR3 1696831425624356480
System
HD 135694
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 15.92 Earth days (4.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1247 AU.
Transit Fingerprint
Depth
0.049 %
Duration
4.490 h
Impact parameter b
0.370
Rp / R★
0.024300
Transit midpoint (BJD)
2,459,834.1393
Photometric dip
Transit produces a flux drop of 493 ppm lasting ≈ 4.49 h.
Extended Orbital Architecture
Planet / star radius ratio
0.024300
Semi-major axis / stellar radius
24.500
Impact parameter (b)
0.370
RV semi-amplitude (K)
1.660 m/s
Transit mid-time (BJD)
2,459,834.1393
Long. of periastron (ω)
82.50°
Angular separation (arcsec)
1.69000
Eq. Temperature
751K
(478 °C)
Insolation (S⊕)
71.80
Earth = 1.00
Earth Similarity (ESI)
0.327
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
Akana Murphy et al. 2023Instrument
TESS CCD Array
Publication
2023-10
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: HD 135694
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,712 K — cooler than the Sun (5,778 K)
Estimated Age
9.80 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.080 R☉
Stellar Mass
1.020 M☉
Metallicity [Fe/H]
-0.12
Extended Stellar Properties
Surface gravity (log g)
4.335 dex
Stellar density
1.033 g/cm³
Activity index (log R'HK)
-4.990
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
13.508 mas
Total Proper Motion
205.395 mas/yr
PM Right Ascension
-189.06 mas/yr
PM Declination
80.26 mas/yr
Galactic Cartesian (pc)
x = -0.209 · y = -0.231 · z = 0.950
Equatorial (J2000)
RA 227.86786° · Dec 71.84130°
Galactic ℓ, b
109.157° · 41.335°
Ecliptic λ, β
141.560° · 74.520°
HTM-20 index
746878987
Similar Worlds
Kepler-1419 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.86 R⊕ · 4,887.7 ly
Kepler-1325 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.86 R⊕ · 3,174.7 ly
Kepler-172 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.86 R⊕ · 2,702.5 ly
Kepler-142 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.86 R⊕ · 1,789.6 ly
Kepler-58 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.86 R⊕ · 3,161.3 ly
Kepler-1237 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.86 R⊕ · 3,471.3 ly