Registry · exoplanet

Barnard c

Exoplanet

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: 17h 57m 47.67s
Declination: +04° 44′ 16.7″
Galactic l, b: 31.048, 14.09
Magnitude V: 9.54
Distance: 1.8265 pc

Planet

NASA Exoplanet Archive, composite parameters

Host star	Barnard's star · M4V
Discovery	Radial Velocity, 2025 · Gemini Observatory
Orbital period	4.1244 d
Semi-major axis	0.0274 au
Eccentricity	0.08
Radius	0.743 R⊕ · 0.0663 R♃
Mass	0.335 M⊕ · 0.001054 M♃
Density	4.49 g/cm³
Equilibrium temperature	400 K
System distance	1.8265 pc

Recorded parameters

5 quantities with a single published value

Parameter	Value	Unit	Uncertainty	As published	Source	Reference
Mass	0.335	M_earth	± 0.03	Radial Velocity	NASA Exoplanet Archive	Basant et al. 2025
Orbital period	4.1244	d	± 0.0006	Radial Velocity	NASA Exoplanet Archive	Basant et al. 2025
Semi-major axis	0.0274	au	± 0.0004	Radial Velocity	NASA Exoplanet Archive	Basant et al. 2025
Eccentricity	0.08		± 0.06	Radial Velocity	NASA Exoplanet Archive	Basant et al. 2025
Equilibrium temperature	400	K		Radial Velocity	NASA Exoplanet Archive	Basant et al. 2025

In the same field

within 9 arcmin · wider search

Object	Type	Separation	V
Barnard b	Exoplanet	0.003074″	9.54
Barnard d	Exoplanet	0.003074″	9.54
Barnard e	Exoplanet	0.003074″	9.54
TYC 425-262-1	SB*	133″	11.5
Barnard's Star b	Planet	161.1″	—
Barnard's star	BYDraV*	161.1″	9.511
ZTF J175755.00+045005.8	RRLyrae	365.8″	—
V* V3214 Oph	EclBin	408.8″	—
V* V391 Oph	EclBin	431.9″	—
Z 56-3	Galaxy	432.3″	—
V* V2033 Oph	RRLyrae	444.9″	—

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/barnard-c · Registry entry updated 2026-08-14.