Registry · exoplanet

HD 217107 b

Exoplanet 103 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: 22h 58m 15.53s
Declination: −02° 23′ 43.6″
Galactic l, b: 70.474, -53.32
Magnitude V: 6.155
Distance: 20.062 pc

Also known as

1 identifiers

HD 217107b

Planet

NASA Exoplanet Archive, composite parameters

Host star	HD 217107 · G8IV-V
Discovery	Radial Velocity, 1998 · Lick Observatory
Orbital period	7.12702 d
Semi-major axis	0.07359 au
Eccentricity	0.1284
Radius	13.6 R⊕ · 1.21 R♃
Mass	459.58 M⊕ · 1.446 M♃
Density	1 g/cm³
Equilibrium temperature	1,105.8 K
System distance	20.062 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 8 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
461.169	M_earth	± 15.89	Radial Velocity	NASA Exoplanet Archive	An et al. 2025	2025
459.5799	M_earth	± 57.21	Radial Velocity	NASA Exoplanet Archive	Giovinazzi et al. 2025	2025
440.1923	M_earth	± 12.4	Radial Velocity	NASA Exoplanet Archive	Rosenthal et al. 2021	2021
413.179	M_earth	± 15.89	Radial Velocity	NASA Exoplanet Archive	Stassun et al. 2017	2017
449.2338	M_earth	± 1.335	Radial Velocity	NASA Exoplanet Archive	Feng et al. 2015	2015
441.77	M_earth	± 34.96	Radial Velocity	NASA Exoplanet Archive	Wright et al. 2009	2009
422.7	M_earth	± 15.89	Radial Velocity	NASA Exoplanet Archive	Wittenmyer et al. 2007	2007
435.41	M_earth	± 44.49	Radial Velocity	NASA Exoplanet Archive	Vogt et al. 2005	2005

Orbital period 8 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
7.12686	d	± 1.10e-05	Radial Velocity	NASA Exoplanet Archive	An et al. 2025	2025
7.127017	d	± 4.70e-06	Radial Velocity	NASA Exoplanet Archive	Giovinazzi et al. 2025	2025
7.126874	d	± 6.70e-06	Radial Velocity	NASA Exoplanet Archive	Rosenthal et al. 2021	2021
7.12682	d	± 3.90e-05	Radial Velocity	NASA Exoplanet Archive	Stassun et al. 2017	2017
7.126846	d	± 1.30e-05	Radial Velocity	NASA Exoplanet Archive	Feng et al. 2015	2015
7.126816	d	± 3.90e-05	Radial Velocity	NASA Exoplanet Archive	Wright et al. 2009	2009
7.12689	d	± 5.00e-05	Radial Velocity	NASA Exoplanet Archive	Wittenmyer et al. 2007	2007
7.1269	d	± 0.00022	Radial Velocity	NASA Exoplanet Archive	Vogt et al. 2005	2005

Semi-major axis 8 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
0.0756	au	± 0.0013	Radial Velocity	NASA Exoplanet Archive	An et al. 2025	2025
0.07359	au	± 0.00042	Radial Velocity	NASA Exoplanet Archive	Giovinazzi et al. 2025	2025
0.0739	au	± 0.001	Radial Velocity	NASA Exoplanet Archive	Rosenthal et al. 2021	2021
0.08	au	± 0	Radial Velocity	NASA Exoplanet Archive	Stassun et al. 2017	2017
0.07505	au	± 0.00097	Radial Velocity	NASA Exoplanet Archive	Feng et al. 2015	2015
0.0748	au	± 0.0043	Radial Velocity	NASA Exoplanet Archive	Wright et al. 2009	2009
0.073	au	± 0.001	Radial Velocity	NASA Exoplanet Archive	Wittenmyer et al. 2007	2007
0.074	au	± 0.002	Radial Velocity	NASA Exoplanet Archive	Vogt et al. 2005	2005

Eccentricity 8 values

Value	Uncertainty	Band / method	Source	Reference	Year
0.1311	± 0.003	Radial Velocity	NASA Exoplanet Archive	An et al. 2025	2025
0.1284	± 0.0015	Radial Velocity	NASA Exoplanet Archive	Giovinazzi et al. 2025	2025
0.1279	± 0.0017	Radial Velocity	NASA Exoplanet Archive	Rosenthal et al. 2021	2021
0.13	± 0.01	Radial Velocity	NASA Exoplanet Archive	Stassun et al. 2017	2017
0.1283	± 0.0027	Radial Velocity	NASA Exoplanet Archive	Feng et al. 2015	2015
0.1267	± 0.0052	Radial Velocity	NASA Exoplanet Archive	Wright et al. 2009	2009
0.132	± 0.005	Radial Velocity	NASA Exoplanet Archive	Wittenmyer et al. 2007	2007
0.13	± 0.02	Radial Velocity	NASA Exoplanet Archive	Vogt et al. 2005	2005

In the same field

within 9 arcmin · wider search

Object	Type	Separation	V
HD 217107 c	Exoplanet	0″	6.155
HD 217107	**	0.2558″	6.163
LEDA 1092606	Seyfert2	108.1″	—
SDSS J225803.78-022742.6	QSO	296.9″	—
LEDA 1095123	Seyfert1	313.9″	—
LEDA 1095194	EmissionG	460.8″	—
CRTS J225743.5-022452	RRLyrae	483.5″	15.48
SDSS J225819.05-021540.8	QSO	485.6″	—

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/hd-217107-b · Registry entry updated 2026-08-14.