Key parameters at a glance
- A radius of 5.27 Earth radii
- A mass of 24.15 Earth masses
- Surface gravity around 0.87 g
- An orbital period of 30.930 days
- Semi-major axis 0.1960 AU
- Distance from Earth 182.23 light-years
- Earth Similarity Index 0.462
- Travel time at Voyager 1 speed 3,213,601 years
Context from the literature
HD 109271 is a wide binary star system in the constellation of Virgo. The brighter member of the binary has a pair of orbiting exoplanets. With an apparent visual magnitude of 8.05, it cannot be seen with the naked eye. Parallax measurements made by Gaia put the star at a distance of 181 light-years away from the Sun, but it is drifting closer with a radial velocity of −5 km/s. The system shows a high proper motion, traversing the celestial sphere at an angular rate of 0.232 arcsec yr−1.
Excerpted from Wikipedia · full article
1 sibling around HD 109271
HD 109271 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 |
|---|---|---|---|---|---|---|
| HD 109271 b | Neptune-like | 4.31 | 17.16 | 7.854 | — | 2013 |
| HD 109271 c this | Neptune-like | 5.27 | 24.15 | 30.930 | — | 2013 |
HD 109271 c Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#346of 574
top 60.1%
This planet
5.27R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | HD 109271 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 5.27 | 11.21 |
| Mass (M⊕) | 1.00 | 24.15 | 317.83 |
| Density (g/cm³) | 5.51 | 0.91 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.87 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 24.154 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 109271
HIP
HIP 61300
TIC
TIC 429301734
Gaia DR2
Gaia DR2 3578137838413202688
Gaia DR3
Gaia DR3 3578137842709899648
System
HD 109271
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 30.93 Earth days (8.5% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.1960 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.462
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Lo Curto et al. 2013Instrument
HARPS Spectrograph
Publication
2013-03
Observation locale
Ground
Discovery cohort
Planets confirmed in 2013 at La Silla Observatory (10 shown).
Host System: HD 109271
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,783 K — hotter than the Sun (5,778 K)
Estimated Age
7.30 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.295 R☉
Stellar Mass
1.047 M☉
Metallicity [Fe/H]
0.10
Extended Stellar Properties
Surface gravity (log g)
4.280 dex
Stellar density
0.744 g/cm³
Systemic radial velocity
-4.90 km/s
Rotational v·sin i
2.70 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
17.870 mas
Total Proper Motion
187.983 mas/yr
PM Right Ascension
-169.69 mas/yr
PM Declination
80.88 mas/yr
Galactic Cartesian (pc)
x = -0.969 · y = -0.143 · z = -0.201
Equatorial (J2000)
RA 188.39740° · Dec -11.62152°
Galactic ℓ, b
295.976° · 51.009°
Ecliptic λ, β
192.302° · -7.350°
HTM-20 index
1671657651
Similar Worlds
Kepler-100 e
Neptune-like · G-type yellow (Sun-like)
Radius 5.27 R⊕ · 993.6 ly
K2-32 b
Neptune-like · G-type yellow (Sun-like)
Radius 5.30 R⊕ · 514.3 ly
HD 10180 f
Neptune-like · G-type yellow (Sun-like)
Radius 5.24 R⊕ · 127.1 ly
Kepler-223 d
Neptune-like · G-type yellow (Sun-like)
Radius 5.24 R⊕ · 6,065.6 ly
Kepler-396 c
Neptune-like · G-type yellow (Sun-like)
Radius 5.30 R⊕ · 729.8 ly
Kepler-495 b
Neptune-like · G-type yellow (Sun-like)
Radius 5.23 R⊕ · 2,149.1 ly