Registry · exoplanet

47 UMa 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: 10h 59m 27.54s
Declination: +40° 25′ 49.8″
Galactic l, b: 175.78, 63.37
Magnitude V: 5.034
Distance: 13.797 pc

Planet

NASA Exoplanet Archive, composite parameters

Host star	47 UMa · G0V
Discovery	Radial Velocity, 2001 · Lick Observatory
Orbital period	2,391 d
Semi-major axis	3.6 au
Eccentricity	0.098
Radius	14.2 R⊕ · 1.27 R♃
Mass	171.62 M⊕ · 0.54 M♃
Density	0.329 g/cm³
Equilibrium temperature	164.38 K
System distance	13.797 pc

Published measurements

4 quantities measured more than once

One object can carry a dozen published estimates of the same quantity. The register keeps them side by side rather than picking a winner — the citation is part of the value.

Mass 4 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
164	M_earth	± 12	Radial Velocity	NASA Exoplanet Archive	Harada et al. 2025	2025
157.9607	M_earth	± 10.17	Radial Velocity	NASA Exoplanet Archive	Rosenthal et al. 2021	2021
171.621	M_earth	± 20.98	Radial Velocity	NASA Exoplanet Archive	Gregory & Fischer 2010	2010
425.87	M_earth	± 69.92	Radial Velocity	NASA Exoplanet Archive	Wittenmyer et al. 2007	2007

Orbital period 4 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
2,265	d	± 15	Radial Velocity	NASA Exoplanet Archive	Harada et al. 2025	2025
2,287	d	± 19	Radial Velocity	NASA Exoplanet Archive	Rosenthal et al. 2021	2021
2,391	d	± 100	Radial Velocity	NASA Exoplanet Archive	Gregory & Fischer 2010	2010
7,586	d	± 727	Radial Velocity	NASA Exoplanet Archive	Wittenmyer et al. 2007	2007

Semi-major axis 4 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
3.453	au	± 0.065	Radial Velocity	NASA Exoplanet Archive	Harada et al. 2025	2025
3.404	au	± 0.054	Radial Velocity	NASA Exoplanet Archive	Rosenthal et al. 2021	2021
3.6	au	± 0.1	Radial Velocity	NASA Exoplanet Archive	Gregory & Fischer 2010	2010
7.73	au	± 0.58	Radial Velocity	NASA Exoplanet Archive	Wittenmyer et al. 2007	2007

Eccentricity 4 values

Value	Uncertainty	Band / method	Source	Reference	Year
0.247	± 0.086	Radial Velocity	NASA Exoplanet Archive	Harada et al. 2025	2025
0.179	± 0.09	Radial Velocity	NASA Exoplanet Archive	Rosenthal et al. 2021	2021
0.098	± 0.047	Radial Velocity	NASA Exoplanet Archive	Gregory & Fischer 2010	2010
0.005		Radial Velocity	NASA Exoplanet Archive	Wittenmyer et al. 2007	2007

In the same field

within 9 arcmin · wider search

Object	Type	Separation	V
47 UMa b	Exoplanet	0″	5.034
47 UMa	Star	0″	—
47 UMa d	Exoplanet	0″	5.034
* 47 UMa d	Planet	4.985″	—
* 47 UMa b	Planet	4.985″	—
* 47 UMa c	Planet	4.985″	—
* 47 UMa	HighPM*	4.985″	—
2MASS J10595324+4020557	QSO	415.8″	—
SDSS J105847.97+402738.4	QSO	464.5″	—
SDSS J105946.85+403314.5	QSO	496.3″	—

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/47-uma-c · Registry entry updated 2026-08-14.