Confirmed Exoplanet Discovered 2021

HD 63935 b

A sub-neptune orbiting the g-type yellow (sun-like) HD 63935, located approximately 159.7 light-years from Earth.

Key parameters at a glance

  • A radius of 2.92 Earth radii
  • A mass of 10.50 Earth masses
  • Surface gravity around 1.24 g
  • An orbital period of 9.059 days
  • Semi-major axis 0.0830 AU
  • Equilibrium temperature 825 K (552 °C)
  • Distance from Earth 159.73 light-years
  • Earth Similarity Index 0.295
  • Travel time at Voyager 1 speed 2,816,862 years

1 sibling around HD 63935

HD 63935 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 63935 b this Sub-Neptune 2.92 10.50 9.059 825 2021
HD 63935 c Sub-Neptune 3.06 11.10 21.403 620 2021

HD 63935 b Planet Profile

Physical Specs

Radius
2.92 R⊕
Radius (Jupiter)
0.260 R♃
Mass
10.50 M⊕
Mass (Jupiter)
0.033 M♃
Density
2.32 g/cm³
Surface Gravity
1.24 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.295
HZ Position Inner
Controversial No

Discovery

Year 2021
Method Transit
Facility Transiting Exoplanet Survey Satellite (TESS)
Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#607of 1978

top 30.6%

This planet

2.92R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

HD 136352 c 2.92 R⊕ TOI-1203.01 2.92 R⊕ Kepler-153 b 2.92 R⊕
Metric Earth HD 63935 b Jupiter
Radius (R⊕)1.002.9211.21
Mass (M⊕)1.0010.50317.83
Density (g/cm³)5.512.321.33
Surface Gravity (g)1.001.242.53
Insolation (S⊕)1.00115.600.037

Alternative Mass Estimates

Method Value Interpretation
Best measured mass 10.500 M⊕ Direct mass measurement (not derived).

Star Catalogue Identifiers

HD

HD 63935

HIP

HIP 38374

TIC

TIC 453211454

Gaia DR2

Gaia DR2 3145754895088191744

Gaia DR3

Gaia DR3 3145754895088191744

System

HD 63935

Percentile among Sub-Neptune cohort

Radius 2.916 R⊕ · percentile 69 / cohort 1978
Mass 10.500 M⊕ · percentile 76 / cohort 1978
Orbital period 9.06 d · percentile 30 / cohort 1946
Distance 48.97 pc · percentile 12 / cohort 1975
ESI 0.295 · percentile 26 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period
9.059 days
Semi-major axis
0.0830 AU
Eccentricity
0.000
Inclination
88.49 °

Year Length

A year here lasts approximately 9.06 Earth days (2.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0830 AU.

Transit Fingerprint

Depth

0.088 %

Duration

3.703 h

Impact parameter b

0.296

Rp / R★

0.027851

Transit midpoint (BJD)

2,458,494.4467

Photometric dip

Transit produces a flux drop of 875 ppm lasting ≈ 3.70 h.

Extended Orbital Architecture

Planet / star radius ratio

0.027851

Semi-major axis / stellar radius

18.640

Impact parameter (b)

0.296

RV semi-amplitude (K)

3.370 m/s

Transit mid-time (BJD)

2,458,494.4467

Long. of periastron (ω)

90.00°

Angular separation (arcsec)

1.69000

Eq. Temperature

825K

(552 °C)

Insolation (S⊕)

115.60

Earth = 1.00

Earth Similarity (ESI)

0.295

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

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

Scarsdale et al. 2021

Instrument

TESS CCD Array

Publication

2021-11

Observation locale

Space

Discovery cohort

Planets confirmed in 2021 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

TOI-2257 b · Sub-Neptune TOI-2285 b · Super-Earth TOI-1231 b · Sub-Neptune AU Mic c · Sub-Neptune LHS 1678 c · Rocky Terrestrial LHS 1478 b · Rocky Terrestrial TOI-2406 b · Sub-Neptune HD 207897 b · Sub-Neptune TOI-269 b · Sub-Neptune TIC 172900988 b · Gas Giant TOI-178 g · Sub-Neptune TOI-2076 d · Sub-Neptune

Host System: HD 63935

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,513 K — cooler than the Sun (5,778 K)

Estimated Age

6.60 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.960 R☉

Stellar Mass

0.941 M☉

Metallicity [Fe/H]

0.11

Extended Stellar Properties

Surface gravity (log g)

4.445 dex

Stellar density

1.486 g/cm³

Activity index (log R'HK)

-5.060

Metallicity ratio

[Fe/H]

Distance
48.97 parsec
Light-years 159.73 ly
V-band magnitude
8.58 mag
Voyager-speed travel 2,816,862 yr

Multi-band Host Photometry — 11 bands

6.89.39.31B8.58V8.39Gaia7.93TESS7.30J6.96H6.88K6.81W16.88W26.88W36.79W4

Astrometric Data

Parallax

20.390 mas

Total Proper Motion

204.497 mas/yr

PM Right Ascension

-78.80 mas/yr

PM Declination

-188.71 mas/yr

Galactic Cartesian (pc)

x = -0.462 · y = 0.872 · z = 0.163

Equatorial (J2000)

RA 117.92464° · Dec 9.38524°

Galactic ℓ, b

211.236° · 17.613°

Ecliptic λ, β

118.114° · -11.370°

HTM-20 index

-407457889

Similar Worlds

HD 136352 c

Sub-Neptune · G-type yellow (Sun-like)

Radius 2.92 R⊕ · 47.9 ly

TOI-1203.01

Sub-Neptune · G-type yellow (Sun-like)

Radius 2.92 R⊕ · 212.0 ly

Kepler-153 b

Sub-Neptune · G-type yellow (Sun-like)

Radius 2.92 R⊕ · 1,498.3 ly

Kepler-277 b

Sub-Neptune · G-type yellow (Sun-like)

Radius 2.92 R⊕ · 3,185.4 ly

Kepler-1878 b

Sub-Neptune · G-type yellow (Sun-like)

Radius 2.92 R⊕ · 4,873.7 ly

Kepler-949 b

Sub-Neptune · G-type yellow (Sun-like)

Radius 2.91 R⊕ · 1,585.5 ly

Explore Related Categories

Sub-Neptune Planets Transit Discoveries Transiting Exoplanet Survey Satellite (TESS) Mission G-type yellow (Sun-like) Hosts