Key parameters at a glance
- A mass of 3,359.45 Earth masses
- An orbital period of 8.135 days
- Semi-major axis 0.0700 AU
- Distance from Earth 84.35 light-years
- Travel time at Voyager 1 speed 1,487,509 years
- Almost certainly tidally locked to its host star given the close orbit
2 siblings around HIP 57274
HIP 57274 b 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 |
|---|---|---|---|---|---|---|
| HIP 57274 b this | Unclassified | — | 3,359.45 | 8.135 | — | 2011 |
| HIP 57274 c | Gas Giant | 14.20 | 130.00 | 32.030 | — | 2011 |
| HIP 57274 d | Gas Giant | 14.20 | 167.40 | 431.700 | — | 2011 |
HIP 57274 b Planet Profile
Physical Specs
Classification
Planet Type
Unclassified
Discovery
| Metric | Earth | HIP 57274 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | — | 11.21 |
| Mass (M⊕) | 1.00 | 3,359.45 | 317.83 |
| Density (g/cm³) | 5.51 | — | 1.33 |
| Surface Gravity (g) | 1.00 | — | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 3,359.446 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 6.357 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HIP
HIP 57274
TIC
TIC 5078530
Gaia DR2
Gaia DR2 4021079911593673600
Gaia DR3
Gaia DR3 4021079911593673600
System
HIP 57274
Percentile among Unclassified cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 8.14 Earth days (2.2% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0700 AU.
Extended Orbital Architecture
RV semi-amplitude (K)
4.600 m/s
Transit mid-time (BJD)
2,455,801.7790
Long. of periastron (ω)
81.00°
Angular separation (arcsec)
2.71000
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
—
0 = alien, 1 = Earth-identical
Insufficient insolation data. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Fischer et al. 2012Instrument
HIRES Spectrometer
Publication
2012-01
Observation locale
Ground
Discovery cohort
Planets confirmed in 2011 at W. M. Keck Observatory (12 shown).
Host System: HIP 57274
Spectral Class
K-type orange
Effective Temperature
4,510 K — cooler than the Sun (5,778 K)
Estimated Age
7.87 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.780 R☉
Stellar Mass
0.290 M☉
Metallicity [Fe/H]
0.01
Extended Stellar Properties
Surface gravity (log g)
4.110 dex
Stellar density
1.967 g/cm³
Systemic radial velocity
-4.70 km/s
Rotational v·sin i
0.50 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
38.638 mas
Total Proper Motion
382.667 mas/yr
PM Right Ascension
-27.07 mas/yr
PM Declination
-381.71 mas/yr
Galactic Cartesian (pc)
x = -0.856 · y = 0.057 · z = 0.514
Equatorial (J2000)
RA 176.17055° · Dec 30.95765°
Galactic ℓ, b
194.253° · 74.932°
Ecliptic λ, β
163.268° · 26.691°
HTM-20 index
1676755467
Observation Record
Photometric series
1
Stellar spectra
1
Archive notes
1
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