Registry · exoplanet

K2-18 c

Exoplanet 23 papers

harvesting The full record is being pulled from the archives right now — measurement tables, the Gaia row, catalogue photometry. This page will fill itself in.

Right ascension: 11h 30m 14.43s
Declination: +07° 35′ 16.2″
Galactic l, b: 254.63, 62.58
Magnitude V: 13.48
Distance: 38.027 pc

Also known as

1 identifiers

K2-18c

Planet

NASA Exoplanet Archive, composite parameters

Host star	K2-18 · dM2.5
Discovery	Radial Velocity, 2017 · La Silla Observatory
Orbital period	8.962 d
Semi-major axis	0.06 au
Eccentricity	0.47
Radius	2.65 R⊕ · 0.236 R♃
Mass	7.51 M⊕ · 0.02363 M♃
Density	2.22 g/cm³
Equilibrium temperature	363 K
System distance	38.027 pc

Recorded parameters

5 quantities with a single published value

Parameter	Value	Unit	Uncertainty	As published	Source	Reference
Mass	7.51	M_earth	± 1.33	Radial Velocity	NASA Exoplanet Archive	Cloutier et al. 2017
Orbital period	8.962	d	± 0.008	Radial Velocity	NASA Exoplanet Archive	Cloutier et al. 2017
Semi-major axis	0.06	au	± 0.003	Radial Velocity	NASA Exoplanet Archive	Cloutier et al. 2017
Eccentricity	0.47			Radial Velocity	NASA Exoplanet Archive	Cloutier et al. 2017
Equilibrium temperature	363	K	± 14	Radial Velocity	NASA Exoplanet Archive	Cloutier et al. 2017

In the same field

within 9 arcmin · wider search

Object	Type	Separation	V
K2-18 b	Exoplanet	0.003074″	13.48
K2-18	HighPM*	2.41″	13.5
QSO B1127+078	QSO	188.3″	17.7
SDSS J112959.82+073817.0	QSO	282.6″	—
SDSS J112956.44+073712.4	QSO	291.6″	—
LEDA 4282403	AGN Candidate	333″	—
HD 99904	Star	513.7″	6.73

Provenance

where this card came from

Archive	Read at (UTC)	Record
Seeded from the bulk archive load; no per-object fetch yet.

Machine-readable: /api/v1/object/k2-18-c · Registry entry updated 2026-08-14.