Registry · exoplanet

47 UMa b

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, 1996 · Lick Observatory
Orbital period	1,078 d
Semi-major axis	2.1 au
Eccentricity	0.032
Radius	13.2 R⊕ · 1.18 R♃
Mass	804.08 M⊕ · 2.53 M♃
Density	1.92 g/cm³
Equilibrium temperature	215.23 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 6 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
792	M_earth	± 34	Radial Velocity	NASA Exoplanet Archive	Harada et al. 2025	2025
774.8657	M_earth	± 27.02	Radial Velocity	NASA Exoplanet Archive	Rosenthal et al. 2021	2021
804.08	M_earth	± 22.25	Radial Velocity	NASA Exoplanet Archive	Gregory & Fischer 2010	2010
778.6835	M_earth	± 31.78	Radial Velocity	NASA Exoplanet Archive	Wittenmyer et al. 2009	2009
826.32	M_earth	± 41.32	Radial Velocity	NASA Exoplanet Archive	Wittenmyer et al. 2007	2007
877.17	M_earth	± 31.78	Radial Velocity	NASA Exoplanet Archive	Naef et al. 2004	2004

Orbital period 6 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
1,076.06	d	± 1.5	Radial Velocity	NASA Exoplanet Archive	Harada et al. 2025	2025
1,076.6	d	± 1.3	Radial Velocity	NASA Exoplanet Archive	Rosenthal et al. 2021	2021
1,078	d	± 2	Radial Velocity	NASA Exoplanet Archive	Gregory & Fischer 2010	2010
1,076.6	d	± 2.3	Radial Velocity	NASA Exoplanet Archive	Wittenmyer et al. 2009	2009
1,083.2	d	± 1.8	Radial Velocity	NASA Exoplanet Archive	Wittenmyer et al. 2007	2007
1,100.8	d	± 7.2	Radial Velocity	NASA Exoplanet Archive	Naef et al. 2004	2004

Semi-major axis 6 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
2.104	au	± 0.039	Radial Velocity	NASA Exoplanet Archive	Harada et al. 2025	2025
2.059	au	± 0.031	Radial Velocity	NASA Exoplanet Archive	Rosenthal et al. 2021	2021
2.1	au	± 0.02	Radial Velocity	NASA Exoplanet Archive	Gregory & Fischer 2010	2010
2.1	au	± 0.022	Radial Velocity	NASA Exoplanet Archive	Wittenmyer et al. 2009	2009
2.11	au	± 0.04	Radial Velocity	NASA Exoplanet Archive	Wittenmyer et al. 2007	2007
2.11	au		Radial Velocity	NASA Exoplanet Archive	Naef et al. 2004	2004

Eccentricity 6 values

Value	Uncertainty	Band / method	Source	Reference	Year
0.03	± 0.008	Radial Velocity	NASA Exoplanet Archive	Harada et al. 2025	2025
0.016	± 0.0076	Radial Velocity	NASA Exoplanet Archive	Rosenthal et al. 2021	2021
0.032	± 0.014	Radial Velocity	NASA Exoplanet Archive	Gregory & Fischer 2010	2010
0.012	± 0.023	Radial Velocity	NASA Exoplanet Archive	Wittenmyer et al. 2009	2009
0.049	± 0.014	Radial Velocity	NASA Exoplanet Archive	Wittenmyer et al. 2007	2007
0.097	± 0.039	Radial Velocity	NASA Exoplanet Archive	Naef et al. 2004	2004

In the same field

within 9 arcmin · wider search

Object	Type	Separation	V
47 UMa	Star	0″	—
47 UMa c	Exoplanet	0″	5.034
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-b · Registry entry updated 2026-08-14.