Key parameters at a glance
- A radius of 12.70 Earth radii
- A mass of 2,063.66 Earth masses
- Surface gravity around 12.79 g
- An orbital period of 5,019.542 days
- Semi-major axis 5.3620 AU
- Distance from Earth 142.93 light-years
- Earth Similarity Index 0.442
- Travel time at Voyager 1 speed 2,520,502 years
Context from the literature
HD 27894 is a single star with a system of orbiting exoplanets, located in the southern constellation of Reticulum. It is too faint to be seen with the naked eye at an apparent visual magnitude of 9.36. This system lies at a distance of 142.5 light years from the Sun, as determined via parallax measurements, and is drifting further away with a radial velocity of 83 km/s.
Excerpted from Wikipedia · full article
2 siblings around HD 27894
HD 27894 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 27894 b | Gas Giant | 14.10 | 196.74 | 18.019 | — | 2005 |
| HD 27894 c | Neptune-like | 8.24 | 51.49 | 36.070 | — | 2017 |
| HD 27894 d this | Gas Giant | 12.70 | 2,063.66 | 5,019.542 | — | 2017 |
HD 27894 d Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1130of 1771
top 63.7%
This planet
12.70R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HD 27894 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.70 | 11.21 |
| Mass (M⊕) | 1.00 | 2,063.66 | 317.83 |
| Density (g/cm³) | 5.51 | 5.54 | 1.33 |
| Surface Gravity (g) | 1.00 | 12.79 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 2,063.660 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 1,721.049 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 27894
HIP
HIP 20277
TIC
TIC 396697266
Gaia DR2
Gaia DR2 4678605152248591488
Gaia DR3
Gaia DR3 4678605152248591488
System
HD 27894
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 13.74 Earth years on a highly eccentric trajectory at a mean orbital distance of 5.3620 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.442
0 = alien, 1 = Earth-identical
Detection Signatures
Radial velocity
Stellar wobble has been measured spectroscopically.
Astrometry
Positional wobble of the host star was measured.
Discovery Paper
Primary reference
Trifonov et al. 2017Instrument
HARPS Spectrograph
Publication
2017-06
Observation locale
Ground
Discovery cohort
Planets confirmed in 2017 at La Silla Observatory (12 shown).
Host System: HD 27894
Spectral Class
K-type orange
Effective Temperature
4,875 K — cooler than the Sun (5,778 K)
Estimated Age
3.90 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.892 R☉
Stellar Mass
0.810 M☉
Metallicity [Fe/H]
0.30
Extended Stellar Properties
Surface gravity (log g)
4.220 dex
Stellar density
1.846 g/cm³
Systemic radial velocity
82.90 km/s
Rotational v·sin i
1.50 km/s
Rotation period
44.00 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
22.791 mas
Total Proper Motion
325.715 mas/yr
PM Right Ascension
182.31 mas/yr
PM Declination
269.91 mas/yr
Galactic Cartesian (pc)
x = 0.213 · y = 0.462 · z = -0.861
Equatorial (J2000)
RA 65.19757° · Dec -59.40968°
Galactic ℓ, b
270.100° · -42.009°
Ecliptic λ, β
20.873° · -76.793°
HTM-20 index
1725638851
Observation Record
Photometric series
1
RV measurements
1
Archive notes
1
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