Key parameters at a glance

A radius of 13.20 Earth radii
A mass of 371.53 Earth masses
Surface gravity around 2.13 g
An orbital period of 2.797 days
Semi-major axis 0.0379 AU
Equilibrium temperature 1,271 K (998 °C)
Distance from Earth 1,273.95 light-years
Earth Similarity Index 0.110
Travel time at Voyager 1 speed 22,466,032 years

HAT-P-37 b Planet Profile

Physical Specs

Radius

13.20 R⊕

Radius (Jupiter)

1.178 R♃

Mass

371.53 M⊕

Mass (Jupiter)

1.169 M♃

Density

0.89 g/cm³

Surface Gravity

2.13 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.110

HZ Position Inner

Controversial No

Discovery

Year 2011

Method Transit

Facility HATNet

Telescope Canon 200mm f/1.8L

Size rank in cohort

Rank by radius

#846of 1771

top 47.7%

This planet

13.20R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 12661 c 13.20 R⊕ HD 37605 b 13.20 R⊕ MOA-2009-BLG-387L b 13.20 R⊕

Metric	Earth	HAT-P-37 b	Jupiter
Radius (R⊕)	1.00	13.20	11.21
Mass (M⊕)	1.00	371.53	317.83
Density (g/cm³)	5.51	0.89	1.33
Surface Gravity (g)	1.00	2.13	2.53
Insolation (S⊕)	1.00	412.39	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	371.528 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 267572272

Gaia DR2

Gaia DR2 2133946843094378752

Gaia DR3

Gaia DR3 2133946843094378752

System

HAT-P-37

Percentile among Gas Giant cohort

Radius 13.204 R⊕ · percentile 52 / cohort 1771

Mass 371.528 M⊕ · percentile 39 / cohort 1747

Orbital period 2.80 d · percentile 13 / cohort 1533

Distance 390.59 pc · percentile 68 / cohort 1759

ESI 0.110 · percentile 29 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2.797 days

Semi-major axis

0.0379 AU

Eccentricity

0.058

Inclination

86.90 °

Year Length

A year here lasts approximately 2.80 Earth days (0.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0379 AU.

Transit Fingerprint

Depth

1.899 %

Duration

2.330 h

Impact parameter b

0.505

Rp / R★

0.137800

Transit midpoint (BJD)

2,455,642.1432

Photometric dip

Transit produces a flux drop of 18,990 ppm lasting ≈ 2.33 h.

Extended Orbital Architecture

Planet / star radius ratio

0.137800

Semi-major axis / stellar radius

9.320

Impact parameter (b)

0.505

RV semi-amplitude (K)

177.700 m/s

Transit mid-time (BJD)

2,455,642.1432

Long. of periastron (ω)

164.00°

Angular separation (arcsec)

0.09700

Eq. Temperature

1,271K

(998 °C)

Insolation (S⊕)

412.39

Earth = 1.00

Earth Similarity (ESI)

0.110

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

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

Bakos et al. 2012

Instrument

2K CCD Sensor

Publication

2012-07

Observation locale

Ground

Discovery cohort

Planets confirmed in 2011 at HATNet (10 shown).

HAT-P-27 b · Gas Giant HAT-P-31 b · Gas Giant HAT-P-29 b · Gas Giant HAT-P-34 b · Gas Giant HAT-P-28 b · Gas Giant HAT-P-35 b · Gas Giant HAT-P-36 b · Gas Giant HAT-P-30 b · Gas Giant HAT-P-33 b · Gas Giant HAT-P-32 b · Gas Giant

Host System: HAT-P-37

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,500 K — cooler than the Sun (5,778 K)

Estimated Age

3.60 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.877 R☉

Stellar Mass

0.929 M☉

Metallicity [Fe/H]

0.03

Extended Stellar Properties

Surface gravity (log g)

4.520 dex

Stellar density

1.870 g/cm³

Systemic radial velocity

-20.53 km/s

Rotational v·sin i

3.07 km/s

Metallicity ratio

[Fe/H]

Distance

390.59 parsec

Light-years 1,273.95 ly

V-band magnitude

13.43 mag

Voyager-speed travel 22,466,032 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

2.531 mas

Total Proper Motion

4.202 mas/yr

PM Right Ascension

-4.11 mas/yr

PM Declination

-0.85 mas/yr

Galactic Cartesian (pc)

x = 0.154 · y = -0.606 · z = 0.780

Equatorial (J2000)

RA 284.29604° · Dec 51.26912°

Galactic ℓ, b

81.208° · 19.984°

Ecliptic λ, β

302.131° · 73.115°

HTM-20 index

-560714427