Key parameters at a glance
- A radius of 1.07 Earth radii
- A mass of 1.25 Earth masses
- Surface gravity around 1.09 g
- An orbital period of 4.209 days
- Semi-major axis 0.0503 AU
- Equilibrium temperature 1,040 K (767 °C)
- Distance from Earth 73.07 light-years
- Earth Similarity Index 0.308
- Travel time at Voyager 1 speed 1,288,596 years
2 siblings around HD 63433
HD 63433 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 63433 d this | Rocky Terrestrial | 1.07 | 1.25 | 4.209 | 1,040 | 2023 |
| HD 63433 b | Sub-Neptune | 2.14 | 21.76 | 7.108 | 967 | 2020 |
| HD 63433 c | Sub-Neptune | 2.69 | 15.54 | 20.544 | 679 | 2020 |
HD 63433 d Planet Profile
Physical Specs
Classification
Planet Type
Rocky Terrestrial
Discovery
Size rank in cohort
Rank by radius
#260of 570
top 45.4%
This planet
1.07R⊕
Rocky Terrestrial median
1.01R⊕
Nearest-size peers
| Metric | Earth | HD 63433 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.07 | 11.21 |
| Mass (M⊕) | 1.00 | 1.25 | 317.83 |
| Density (g/cm³) | 5.51 | 5.56 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.09 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Star Catalogue Identifiers
HD
HD 63433
HIP
HIP 38228
TIC
TIC 130181866
Gaia DR2
Gaia DR2 875071278432954240
Gaia DR3
Gaia DR3 875071278432954240
System
HD 63433
Percentile among Rocky Terrestrial cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.21 Earth days (1.2% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0503 AU.
Transit Fingerprint
Duration
2.585 h
Impact parameter b
0.230
Rp / R★
0.010790
Transit midpoint (BJD)
2,459,373.8235
Extended Orbital Architecture
Planet / star radius ratio
0.010790
Semi-major axis / stellar radius
11.870
Impact parameter (b)
0.230
Transit mid-time (BJD)
2,459,373.8235
Angular separation (arcsec)
2.25000
Eq. Temperature
1,040K
(767 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.308
0 = alien, 1 = Earth-identical
Insufficient insolation data — the dayside is scorched.
Discovery Paper
Primary reference
Capistrant et al. 2024Instrument
TESS CCD Array
Publication
2024-02
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: HD 63433
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,688 K — cooler than the Sun (5,778 K)
Estimated Age
0.41 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.912 R☉
Stellar Mass
0.990 M☉
Metallicity [Fe/H]
0.03
Extended Stellar Properties
Surface gravity (log g)
4.520 dex
Stellar density
1.833 g/cm³
Systemic radial velocity
-16.07 km/s
Rotational v·sin i
7.26 km/s
Rotation period
6.40 days
Activity index (log R'HK)
-4.390
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
44.607 mas
Total Proper Motion
15.118 mas/yr
PM Right Ascension
-10.03 mas/yr
PM Declination
-11.31 mas/yr
Galactic Cartesian (pc)
x = -0.410 · y = 0.788 · z = 0.460
Equatorial (J2000)
RA 117.47937° · Dec 27.36313°
Galactic ℓ, b
193.282° · 24.147°
Ecliptic λ, β
114.341° · 6.217°
HTM-20 index
310887370
Similar Worlds
Kepler-376 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.07 R⊕ · 3,010.6 ly
Kepler-1570 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.07 R⊕ · 2,997.4 ly
Kepler-1605 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.08 R⊕ · 1,781.6 ly
Kepler-1594 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.06 R⊕ · 3,186.1 ly
Kepler-115 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.09 R⊕ · 2,033.9 ly
Kepler-212 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.09 R⊕ · 2,241.3 ly