Key parameters at a glance

A radius of 14.20 Earth radii
A mass of 174.81 Earth masses
Surface gravity around 0.87 g
An orbital period of 123.050 days
Semi-major axis 0.5400 AU
Distance from Earth 1,991.88 light-years
Earth Similarity Index 0.260
Travel time at Voyager 1 speed 35,126,866 years

BD+42 2315 b Planet Profile

Physical Specs

Radius

14.20 R⊕

Radius (Jupiter)

1.260 R♃

Mass

174.81 M⊕

Mass (Jupiter)

0.550 M♃

Density

0.34 g/cm³

Surface Gravity

0.87 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.260

HZ Position Unknown

Controversial No

Discovery

Year 2023

Method Radial Velocity

Facility McDonald Observatory

Telescope 9.2 m Hobby-Eberly Telescope

Size rank in cohort

Rank by radius

#334of 1771

top 18.8%

This planet

14.20R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

OGLE-2011-BLG-0251L b 14.20 R⊕ HIP 57274 c 14.20 R⊕ HD 187123 b 14.20 R⊕

Metric	Earth	BD+42 2315 b	Jupiter
Radius (R⊕)	1.00	14.20	11.21
Mass (M⊕)	1.00	174.81	317.83
Density (g/cm³)	5.51	0.34	1.33
Surface Gravity (g)	1.00	0.87	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	174.806 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 376689863

Gaia DR2

Gaia DR2 1534760078795225728

Gaia DR3

Gaia DR3 1534760078795225728

System

BD+42 2315

Percentile among Gas Giant cohort

Radius 14.200 R⊕ · percentile 79 / cohort 1771

Mass 174.806 M⊕ · percentile 16 / cohort 1747

Orbital period 123.05 d · percentile 54 / cohort 1533

Distance 610.72 pc · percentile 79 / cohort 1759

ESI 0.260 · percentile 48 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

123.050 days

Semi-major axis

0.5400 AU

Eccentricity

0.730

Inclination

— °

Year Length

A year here lasts approximately 123.05 Earth days (33.7% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.5400 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

26.700 m/s

Transit mid-time (BJD)

2,453,155.6600

Long. of periastron (ω)

109.20°

Angular separation (arcsec)

0.88400

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.260

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Niedzielski et al. 2023

Instrument

High Resolution Spectrograph

Publication

2023-12

Observation locale

Ground

Discovery cohort

Planets confirmed in 2023 at McDonald Observatory (2 shown).

LHS 3154 b · Sub-Neptune BD+37 3172 b · Gas Giant

Host System: BD+42 2315

Spectral Class

K-type orange

Effective Temperature

4,500 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

17.850 R☉

Stellar Mass

1.380 M☉

Metallicity [Fe/H]

-0.20

Extended Stellar Properties

Surface gravity (log g)

2.000 dex

Rotational v·sin i

2.20 km/s

Rotation period

414.00 days

Metallicity ratio

[Fe/H]

Distance

610.72 parsec

Light-years 1,991.88 ly

V-band magnitude

9.72 mag

Voyager-speed travel 35,126,866 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

1.609 mas

Total Proper Motion

23.728 mas/yr

PM Right Ascension

19.65 mas/yr

PM Declination

-13.30 mas/yr

Galactic Cartesian (pc)

x = -0.745 · y = -0.099 · z = 0.660

Equatorial (J2000)

RA 187.58876° · Dec 41.26957°

Galactic ℓ, b

138.624° · 75.210°

Ecliptic λ, β

167.047° · 40.140°

HTM-20 index

1326306948

Similar Worlds

HD 45364 c

Gas Giant · K-type orange

Radius 14.20 R⊕ · 112.0 ly

HD 192263 b

Gas Giant · K-type orange

Radius 14.20 R⊕ · 64.0 ly

HIP 5763 b

Gas Giant · K-type orange

Radius 14.20 R⊕ · 104.1 ly

HIP 57274 c

Gas Giant · K-type orange

Radius 14.20 R⊕ · 84.3 ly

HIP 57274 d

Gas Giant · K-type orange

Radius 14.20 R⊕ · 84.3 ly

HD 102195 b

Gas Giant · K-type orange

Radius 14.20 R⊕ · 95.7 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries McDonald Observatory Mission K-type orange Hosts