Confirmed Exoplanet Discovered 2010

HAT-P-17 b

A gas giant orbiting the k-type orange HAT-P-17, located approximately 301.3 light-years from Earth.

Key parameters at a glance

  • A radius of 11.77 Earth radii
  • A mass of 184.34 Earth masses
  • Surface gravity around 1.33 g
  • An orbital period of 10.339 days
  • Semi-major axis 0.0892 AU
  • Equilibrium temperature 800 K (527 °C)
  • Distance from Earth 301.31 light-years
  • Earth Similarity Index 0.162
  • Travel time at Voyager 1 speed 5,313,655 years
  • Almost certainly tidally locked to its host star given the close orbit

1 sibling around HAT-P-17

HAT-P-17 b 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
HAT-P-17 b this Gas Giant 11.77 184.34 10.339 800 2010
HAT-P-17 c Gas Giant 13.10 1,080.60 5,584.000 — 2010

HAT-P-17 b Planet Profile

Physical Specs

Radius
11.77 R⊕
Radius (Jupiter)
1.050 R♃
Mass
184.34 M⊕
Mass (Jupiter)
0.580 M♃
Density
0.44 g/cm³
Surface Gravity
1.33 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.162
HZ Position Inner
Controversial No

Discovery

Year 2010
Method Transit
Facility HATNet
Telescope Canon 200mm f/1.8L

Size rank in cohort

Rank by radius

#1564of 1771

top 88.3%

This planet

11.77R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

WASP-57 b 11.77 R⊕ CoRoT-23 b 11.77 R⊕ Kepler-75 b 11.77 R⊕
Metric Earth HAT-P-17 b Jupiter
Radius (R⊕)1.0011.7711.21
Mass (M⊕)1.00184.34317.83
Density (g/cm³)5.510.441.33
Surface Gravity (g)1.001.332.53
Insolation (S⊕)1.00110.510.037

Alternative Mass Estimates

Method Value Interpretation
Best measured mass 184.341 M⊕ Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 266593143

Gaia DR2

Gaia DR2 1849786481031300608

Gaia DR3

Gaia DR3 1849786481032616960

System

HAT-P-17

Percentile among Gas Giant cohort

Radius 11.769 R⊕ · percentile 12 / cohort 1771
Mass 184.341 M⊕ · percentile 17 / cohort 1747
Orbital period 10.34 d · percentile 44 / cohort 1533
Distance 92.38 pc · percentile 33 / cohort 1759
ESI 0.162 · percentile 38 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period
10.339 days
Semi-major axis
0.0892 AU
Eccentricity
0.350
Inclination
89.20 °

Year Length

A year here lasts approximately 10.34 Earth days (2.8% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.0892 AU.

Transit Fingerprint

Depth

1.500 %

Duration

3.994 h

Impact parameter b

0.470

Rp / R★

0.123700

Transit midpoint (BJD)

2,456,703.4607

Photometric dip

Transit produces a flux drop of 15,000 ppm lasting ≈ 3.99 h.

Extended Orbital Architecture

Planet / star radius ratio

0.123700

Semi-major axis / stellar radius

22.720

Impact parameter (b)

0.470

RV semi-amplitude (K)

58.400 m/s

Transit mid-time (BJD)

2,456,703.4607

Long. of periastron (ω)

201.00°

Sky-projected obliquity (λ)

-27.50°

Angular separation (arcsec)

0.96600

Eq. Temperature

800K

(527 °C)

Insolation (S⊕)

110.51

Earth = 1.00

Earth Similarity (ESI)

0.162

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Radial velocity

Stellar wobble has been measured spectroscopically.

Discovery Paper

Primary reference

Howard et al. 2012

Instrument

2K CCD Sensor

Publication

2012-04

Observation locale

Ground

Discovery cohort

Planets confirmed in 2010 at HATNet (12 shown).

HAT-P-15 b · Gas Giant HAT-P-20 b · Neptune-like HAT-P-18 b · Gas Giant HAT-P-19 b · Gas Giant HAT-P-26 b · Neptune-like HAT-P-21 b · Gas Giant HAT-P-25 b · Gas Giant HAT-P-22 b · Gas Giant HAT-P-16 b · Gas Giant HAT-P-14 b · Gas Giant HAT-P-24 b · Gas Giant HAT-P-23 b · Gas Giant

Host System: HAT-P-17

Spectral Class

K-type orange

Effective Temperature

5,246 K — cooler than the Sun (5,778 K)

Estimated Age

7.00 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.870 R☉

Stellar Mass

0.990 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.530 dex

Stellar density

2.080 g/cm³

Systemic radial velocity

20.31 km/s

Rotational v·sin i

0.84 km/s

Metallicity ratio

[Fe/H]

Distance
92.38 parsec
Light-years 301.31 ly
V-band magnitude
10.38 mag
Voyager-speed travel 5,313,655 yr

Multi-band Host Photometry — 11 bands

8.111.311.33B10.38V10.27Gaia9.75TESS9.02J8.62H8.54K8.51W18.58W28.49W38.07W4

Astrometric Data

Parallax

10.796 mas

Total Proper Motion

150.284 mas/yr

PM Right Ascension

-80.40 mas/yr

PM Declination

-126.97 mas/yr

Galactic Cartesian (pc)

x = 0.702 · y = -0.500 · z = 0.507

Equatorial (J2000)

RA 324.53598° · Dec 30.48819°

Galactic ℓ, b

80.852° · -16.177°

Ecliptic λ, β

339.892° · 41.634°

HTM-20 index

-227908809

Similar Worlds

Kepler-75 b

Gas Giant · K-type orange

Radius 11.77 R⊕ · 2,724.6 ly

HD 184010 c

Gas Giant · K-type orange

Radius 11.80 R⊕ · 198.3 ly

TOI-2379 b

Gas Giant · K-type orange

Radius 11.72 R⊕ · 689.0 ly

TOI-4551 b

Gas Giant · K-type orange

Radius 11.86 R⊕ · 704.5 ly

WASP-89 b

Gas Giant · K-type orange

Radius 11.66 R⊕ · 948.9 ly

HD 153557 d

Gas Giant · K-type orange

Radius 11.90 R⊕ · 58.5 ly

Explore Related Categories

Gas Giant Planets Transit Discoveries HATNet Mission K-type orange Hosts