Key parameters at a glance

A radius of 1.77 Earth radii
A mass of 6.52 Earth masses
Surface gravity around 2.08 g
An orbital period of 4.756 days
Semi-major axis 0.0525 AU
Equilibrium temperature 1,001 K (728 °C)
Distance from Earth 146.17 light-years
Earth Similarity Index 0.284
Travel time at Voyager 1 speed 2,577,680 years
Almost certainly tidally locked to its host star given the close orbit

1 sibling around HD 15337

HD 15337 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
HD 15337 b this	Super-Earth	1.77	6.52	4.756	1,001	2019
HD 15337 c	Sub-Neptune	2.53	6.79	17.181	656	2019

HD 15337 b Planet Profile

Physical Specs

Radius

1.77 R⊕

Radius (Jupiter)

0.158 R♃

Mass

6.52 M⊕

Mass (Jupiter)

0.021 M♃

Density

6.46 g/cm³

Surface Gravity

2.08 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.284

HZ Position Inner

Controversial No

Discovery

Year 2019

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#293of 1176

top 24.8%

This planet

1.77R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

GJ 667 C c 1.77 R⊕ Kepler-286 e 1.77 R⊕ Kepler-215 c 1.77 R⊕

Metric	Earth	HD 15337 b	Jupiter
Radius (R⊕)	1.00	1.77	11.21
Mass (M⊕)	1.00	6.52	317.83
Density (g/cm³)	5.51	6.46	1.33
Surface Gravity (g)	1.00	2.08	2.53
Insolation (S⊕)	1.00	161.73	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	6.519 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HD 15337

HIP

HIP 11433

TIC

TIC 120896927

Gaia DR2

Gaia DR2 5068777809824976256

Gaia DR3

Gaia DR3 5068777809824976256

System

HD 15337

Percentile among Super-Earth cohort

Radius 1.770 R⊕ · percentile 73 / cohort 1176

Mass 6.519 M⊕ · percentile 94 / cohort 1176

Orbital period 4.76 d · percentile 38 / cohort 1164

Distance 44.82 pc · percentile 10 / cohort 1171

ESI 0.284 · percentile 32 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

4.756 days

Semi-major axis

0.0525 AU

Eccentricity

0.058

Inclination

89.30 °

Year Length

A year here lasts approximately 4.76 Earth days (1.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0524 AU.

Transit Fingerprint

Depth

0.034 %

Duration

2.554 h

Impact parameter b

0.386

Rp / R★

0.018980

Transit midpoint (BJD)

2,458,411.4623

Photometric dip

Transit produces a flux drop of 344 ppm lasting ≈ 2.55 h.

Extended Orbital Architecture

Planet / star radius ratio

0.018980

Semi-major axis / stellar radius

13.110

Impact parameter (b)

0.386

RV semi-amplitude (K)

2.820 m/s

Transit mid-time (BJD)

2,458,411.4623

Long. of periastron (ω)

71.62°

Angular separation (arcsec)

1.17000

Eq. Temperature

1,001K

(728 °C)

Insolation (S⊕)

161.73

Earth = 1.00

Earth Similarity (ESI)

0.284

0 = alien, 1 = Earth-identical

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

Gandolfi et al. 2019

Instrument

TESS CCD Array

Publication

2019-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2019 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

LP 791-18 c · Sub-Neptune LTT 1445 A b · Super-Earth TOI-270 d · Sub-Neptune L 98-59 d · Super-Earth GJ 357 b · Rocky Terrestrial GJ 143 b · Sub-Neptune HD 23472 c · Super-Earth L 98-59 c · Super-Earth LP 791-18 b · Rocky Terrestrial TOI-270 c · Sub-Neptune HD 23472 b · Sub-Neptune TOI-270 b · Super-Earth

Host System: HD 15337

Spectral Class

K-type orange

Effective Temperature

5,131 K — cooler than the Sun (5,778 K)

Estimated Age

9.60 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.855 R☉

Stellar Mass

0.829 M☉

Metallicity [Fe/H]

0.03

Extended Stellar Properties

Surface gravity (log g)

4.480 dex

Stellar density

1.881 g/cm³

Systemic radial velocity

-3.80 km/s

Rotational v·sin i

1.00 km/s

Rotation period

36.53 days

Metallicity ratio

[Fe/H]

Distance

44.82 parsec

Light-years 146.17 ly

V-band magnitude

9.10 mag

Voyager-speed travel 2,577,680 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

22.285 mas

Total Proper Motion

224.045 mas/yr

PM Right Ascension

-73.59 mas/yr

PM Declination

-211.61 mas/yr

Galactic Cartesian (pc)

x = 0.709 · y = 0.532 · z = -0.464

Equatorial (J2000)

RA 36.86788° · Dec -27.63612°

Galactic ℓ, b

219.862° · -68.709°

Ecliptic λ, β

23.154° · -39.569°

HTM-20 index

1724703111

Similar Worlds

Kepler-1465 b

Super-Earth · K-type orange

Radius 1.77 R⊕ · 1,172.5 ly

Kepler-1389 b

Super-Earth · K-type orange

Radius 1.77 R⊕ · 1,621.3 ly

Kepler-1846 b

Super-Earth · K-type orange

Radius 1.76 R⊕ · 1,221.8 ly

Kepler-1062 b

Super-Earth · K-type orange

Radius 1.76 R⊕ · 1,296.3 ly

Kepler-1814 c

Super-Earth · K-type orange

Radius 1.76 R⊕ · 2,369.0 ly

Kepler-755 b

Super-Earth · K-type orange

Radius 1.76 R⊕ · 1,301.5 ly

Explore Related Categories

Super-Earth Planets Transit Discoveries Transiting Exoplanet Survey Satellite (TESS) Mission K-type orange Hosts