Key parameters at a glance
- A radius of 12.90 Earth radii
- A mass of 1,570.08 Earth masses
- Surface gravity around 9.44 g
- An orbital period of 127.580 days
- Semi-major axis 0.5100 AU
- Distance from Earth 1,132.08 light-years
- Earth Similarity Index 0.428
- Travel time at Voyager 1 speed 19,964,189 years
Context from the literature
HD 102272 is a star in the equatorial constellation of Leo. With an apparent visual magnitude of 8.69, it is too faint to be visible to the naked eye. The star is located at a distance of approximately 1,140 light years based on parallax measurements, but is drifting closer to the Sun with a radial velocity of −12 km/s. As of 2008, two extrasolar planets are known to orbit the star.
Excerpted from Wikipedia · full article
HD 102272 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1011of 1771
top 57.0%
This planet
12.90R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HD 102272 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.90 | 11.21 |
| Mass (M⊕) | 1.00 | 1,570.08 | 317.83 |
| Density (g/cm³) | 5.51 | 4.02 | 1.33 |
| Surface Gravity (g) | 1.00 | 9.44 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 1,570.080 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 102272
HIP
HIP 57428
TIC
TIC 82605074
Gaia DR2
Gaia DR2 3923915248709126144
Gaia DR3
Gaia DR3 3923915248709126144
System
HD 102272
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 127.58 Earth days (34.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.5100 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.428
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Niedzielski et al. 2009Instrument
High Resolution Spectrograph
Publication
2009-03
Observation locale
Ground
Host System: HD 102272
Spectral Class
K-type orange
Effective Temperature
4,790 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
10.300 R☉
Stellar Mass
1.450 M☉
Metallicity [Fe/H]
-0.41
Extended Stellar Properties
Surface gravity (log g)
2.580 dex
Systemic radial velocity
-11.40 km/s
Rotational v·sin i
3.00 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
2.857 mas
Total Proper Motion
10.616 mas/yr
PM Right Ascension
-7.37 mas/yr
PM Declination
7.64 mas/yr
Galactic Cartesian (pc)
x = -0.968 · y = 0.058 · z = 0.244
Equatorial (J2000)
RA 176.59803° · Dec 14.12402°
Galactic ℓ, b
250.294° · 70.022°
Ecliptic λ, β
171.196° · 11.595°
HTM-20 index
294333650
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