Key parameters at a glance
- A radius of 4.95 Earth radii
- A mass of 21.70 Earth masses
- Surface gravity around 0.89 g
- An orbital period of 8.681 days
- Semi-major axis 0.0790 AU
- Equilibrium temperature 697 K (424 °C)
- Distance from Earth 448.70 light-years
- Earth Similarity Index 0.273
- Travel time at Voyager 1 speed 7,912,812 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around TOI-1272
TOI-1272 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| TOI-1272 b | Neptune-like | 4.13 | 27.00 | 3.316 | 975 | 2022 |
| TOI-1272 c this | Neptune-like | 4.95 | 21.70 | 8.681 | 697 | 2022 |
TOI-1272 c Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#386of 574
top 67.1%
This planet
4.95R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | TOI-1272 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 4.95 | 11.21 |
| Mass (M⊕) | 1.00 | 21.70 | 317.83 |
| Density (g/cm³) | 5.51 | 0.98 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.89 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 21.700 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
TIC
TIC 417948359
Gaia DR2
Gaia DR2 1556242405699527424
Gaia DR3
Gaia DR3 1556242405699527424
System
TOI-1272
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 8.68 Earth days (2.4% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0790 AU.
Extended Orbital Architecture
RV semi-amplitude (K)
7.400 m/s
Transit mid-time (BJD)
2,458,885.3900
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
0.57400
Eq. Temperature
697K
(424 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.273
0 = alien, 1 = Earth-identical
Insufficient insolation data — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Macdougall et al. 2022Instrument
HIRES Spectrometer
Publication
2022-06
Observation locale
Ground
Discovery cohort
Planets confirmed in 2022 at W. M. Keck Observatory (3 shown).
Host System: TOI-1272
Spectral Class
K-type orange
Effective Temperature
5,065 K — cooler than the Sun (5,778 K)
Estimated Age
1.10 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.793 R☉
Stellar Mass
0.877 M☉
Metallicity [Fe/H]
0.18
Extended Stellar Properties
Surface gravity (log g)
4.582 dex
Stellar density
2.465 g/cm³
Rotation period
28.30 days
Activity index (log R'HK)
-4.705
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
7.240 mas
Total Proper Motion
63.472 mas/yr
PM Right Ascension
-63.30 mas/yr
PM Declination
4.66 mas/yr
Galactic Cartesian (pc)
x = -0.609 · y = -0.212 · z = 0.764
Equatorial (J2000)
RA 199.19620° · Dec 49.86106°
Galactic ℓ, b
112.547° · 66.753°
Ecliptic λ, β
169.789° · 51.787°
HTM-20 index
607632516
Similar Worlds
Kepler-257 d
Neptune-like · K-type orange
Radius 4.95 R⊕ · 2,544.9 ly
TOI-880 c
Neptune-like · K-type orange
Radius 4.95 R⊕ · 197.9 ly
HIP 19976 b
Neptune-like · K-type orange
Radius 4.94 R⊕ · 131.3 ly
NGTS-14 A b
Neptune-like · K-type orange
Radius 4.98 R⊕ · 1,050.7 ly
Kepler-229 c
Neptune-like · K-type orange
Radius 4.92 R⊕ · 2,694.9 ly
Kepler-1321 b
Neptune-like · K-type orange
Radius 4.92 R⊕ · 2,508.6 ly