Key parameters at a glance
- A radius of 4.07 Earth radii
- A mass of 15.57 Earth masses
- Surface gravity around 0.94 g
- An orbital period of 4.155 days
- Semi-major axis 0.0510 AU
- Distance from Earth 187.93 light-years
- Earth Similarity Index 0.539
- Travel time at Voyager 1 speed 3,314,205 years
Context from the literature
HD 125612 c is an extrasolar planet which orbits the G-type main sequence star HD 125612, located approximately 188 light years away in the constellation Virgo. The discovery of this planet was announced by the HARPS team on October 19, 2009, together with 31 other planets, including HD 125612 d.
Excerpted from Wikipedia · full article
2 siblings around HD 125612
HD 125612 c 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 125612 c this | Neptune-like | 4.07 | 15.57 | 4.155 | — | 2009 |
| HD 125612 b | Gas Giant | 13.20 | 945.22 | 557.700 | — | 2007 |
| HD 125612 d | Gas Giant | 12.70 | 2,281.37 | 2,822.727 | — | 2009 |
HD 125612 c Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#551of 574
top 95.8%
This planet
4.07R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | HD 125612 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 4.07 | 11.21 |
| Mass (M⊕) | 1.00 | 15.57 | 317.83 |
| Density (g/cm³) | 5.51 | 1.27 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.94 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 15.574 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 125612
HIP
HIP 70123
TIC
TIC 347909637
Gaia DR2
Gaia DR2 6296703260330865536
Gaia DR3
Gaia DR3 6296703260330865536
System
HD 125612
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.15 Earth days (1.1% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0510 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.539
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Lo Curto et al. 2010Instrument
HARPS Spectrograph
Publication
2010-03
Observation locale
Ground
Discovery cohort
Planets confirmed in 2009 at La Silla Observatory (12 shown).
Host System: HD 125612
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,900 K — hotter than the Sun (5,778 K)
Estimated Age
1.77 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.070 R☉
Stellar Mass
1.050 M☉
Metallicity [Fe/H]
0.23
Extended Stellar Properties
Surface gravity (log g)
4.450 dex
Stellar density
1.017 g/cm³
Systemic radial velocity
-18.40 km/s
Rotational v·sin i
2.10 km/s
Rotation period
10.50 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
17.326 mas
Total Proper Motion
90.389 mas/yr
PM Right Ascension
-60.26 mas/yr
PM Declination
-67.37 mas/yr
Galactic Cartesian (pc)
x = -0.779 · y = -0.550 · z = -0.300
Equatorial (J2000)
RA 215.22272° · Dec -17.48181°
Galactic ℓ, b
331.389° · 40.395°
Ecliptic λ, β
218.695° · -3.256°
HTM-20 index
1449905202
Observation Record
Photometric series
1
RV measurements
1
Stellar spectra
2
Archive notes
5
Similar Worlds
Kepler-82 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.07 R⊕ · 2,949.5 ly
Kepler-473 b
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Kepler-302 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.06 R⊕ · 4,574.6 ly
Kepler-1771 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.06 R⊕ · 1,845.2 ly
Kepler-1732 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.10 R⊕ · 4,205.5 ly
K2-7 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.04 R⊕ · 2,408.8 ly