Registry · exoplanet

HD 17156 b

Exoplanet 198 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: 02h 49m 44.79s
Declination: +71° 45′ 11.1″
Galactic l, b: 131.99, 10.99
Magnitude V: 8.17
Distance: 78.086 pc

Also known as

1 identifiers

HD 17156b

Planet

NASA Exoplanet Archive, composite parameters

Host star	HD 17156 · F9V
Discovery	Radial Velocity, 2007 · Subaru Telescope
Orbital period	21.2164 d
Semi-major axis	0.1632 au
Eccentricity	0.6772
Radius	12.263 R⊕ · 1.094 R♃
Mass	1,036.1 M⊕ · 3.26 M♃
Density	3.08 g/cm³
Equilibrium temperature	888 K
System distance	78.086 pc

Published measurements

6 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
1,036.121	M_earth	± 34.96	Radial Velocity	NASA Exoplanet Archive	Kane et al. 2023	2023
1,004.343	M_earth	± 133.5	Radial Velocity	NASA Exoplanet Archive	Ment et al. 2018	2018
1,115.583	M_earth	± 66.74	Radial Velocity	NASA Exoplanet Archive	Stassun et al. 2017	2017
1,028.18	M_earth	± 10.17	Radial Velocity	NASA Exoplanet Archive	Bonomo et al. 2017	2017
1,036.761	M_earth	± 36.23	Radial Velocity	NASA Exoplanet Archive	Southworth 2011	2011
1,014.153	M_earth	± 10.49	Radial Velocity	NASA Exoplanet Archive	Nutzman et al. 2011	2011
1,023.37	M_earth	± 25.43	Radial Velocity	NASA Exoplanet Archive	Barbieri et al. 2009	2009
991.59	M_earth		Radial Velocity	NASA Exoplanet Archive	Fischer et al. 2007	2007

Radius 7 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
12.26262	R_earth	± 0.3475	Radial Velocity	NASA Exoplanet Archive	Kane et al. 2023	2023
12.3299	R_earth	± 0.3363	Radial Velocity	NASA Exoplanet Archive	Stassun et al. 2017	2017
12.18418	R_earth	± 0.07398	Radial Velocity	NASA Exoplanet Archive	Bonomo et al. 2017	2017
11.93759	R_earth	± 0.4035	Radial Velocity	NASA Exoplanet Archive	Southworth 2011	2011
12.274	R_earth	± 0.224	Radial Velocity	NASA Exoplanet Archive	Nutzman et al. 2011	2011
11.43	R_earth	± 0.9	Radial Velocity	NASA Exoplanet Archive	Barbieri et al. 2009	2009
13.1431	R_earth	± 0.6885	Radial Velocity	NASA Exoplanet Archive	ExoFOP	2007

Orbital period 11 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
21.21643	d	± 6.10e-06	Radial Velocity	NASA Exoplanet Archive	Kane et al. 2023	2023
21.21644	d	± 1.10e-06	Radial Velocity	NASA Exoplanet Archive	Kokori et al. 2023	2023
21.21644	d	± 1.30e-06	Radial Velocity	NASA Exoplanet Archive	Ivshina & Winn 2022	2022
21.2167	d	± 0.0003	Radial Velocity	NASA Exoplanet Archive	Ment et al. 2018	2018
21.21663	d	± 0.00045	Radial Velocity	NASA Exoplanet Archive	Stassun et al. 2017	2017
21.2164	d	± 1.60e-05	Radial Velocity	NASA Exoplanet Archive	Bonomo et al. 2017	2017
21.2164	d	± 1.60e-05	Radial Velocity	NASA Exoplanet Archive	Southworth 2011	2011
21.2164	d	± 1.59e-05	Radial Velocity	NASA Exoplanet Archive	Nutzman et al. 2011	2011
21.21663	d	± 0.00045	Radial Velocity	NASA Exoplanet Archive	Barbieri et al. 2009	2009
21.21646	d	± 3.24e-05	Radial Velocity	NASA Exoplanet Archive	ExoFOP	2007
21.2	d	± 0.3	Radial Velocity	NASA Exoplanet Archive	Fischer et al. 2007	2007

Semi-major axis 6 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
0.1632	au	± 0.0027	Radial Velocity	NASA Exoplanet Archive	Kane et al. 2023	2023
0.1607	au	± 0.0091	Radial Velocity	NASA Exoplanet Archive	Ment et al. 2018	2018
0.16278	au	± 0.00076	Radial Velocity	NASA Exoplanet Archive	Bonomo et al. 2017	2017
0.1637	au	± 0.0029	Radial Velocity	NASA Exoplanet Archive	Southworth 2011	2011
0.1614	au	± 0.0022	Radial Velocity	NASA Exoplanet Archive	Barbieri et al. 2009	2009
0.15	au		Radial Velocity	NASA Exoplanet Archive	Fischer et al. 2007	2007

Eccentricity 8 values

Value	Uncertainty	Band / method	Source	Reference	Year
0.6772	± 0.0045	Radial Velocity	NASA Exoplanet Archive	Kane et al. 2023	2023
0.677	± 0.003	Radial Velocity	NASA Exoplanet Archive	Kokori et al. 2023	2023
0.6753	± 0.0048	Radial Velocity	NASA Exoplanet Archive	Ment et al. 2018	2018
0.68	± 0	Radial Velocity	NASA Exoplanet Archive	Stassun et al. 2017	2017
0.6703	± 0.0014	Radial Velocity	NASA Exoplanet Archive	Bonomo et al. 2017	2017
0.6768	± 0.0034	Radial Velocity	NASA Exoplanet Archive	Nutzman et al. 2011	2011
0.6819	± 0.0044	Radial Velocity	NASA Exoplanet Archive	Barbieri et al. 2009	2009
0.67	± 0.08	Radial Velocity	NASA Exoplanet Archive	Fischer et al. 2007	2007

Equilibrium temperature 3 values

Value	Unit	Uncertainty	Band / method	Source	Reference	Year
888	K	± 12	Radial Velocity	NASA Exoplanet Archive	Kane et al. 2023	2023
883	K	± 11	Radial Velocity	NASA Exoplanet Archive	Southworth 2011	2011
581	K		Radial Velocity	NASA Exoplanet Archive	ExoFOP	2007

In the same field

within 9 arcmin · wider search

Object	Type	Separation	V
HD 17156	HighPM*	1.498″	8.16
BD+71 168	Star	331.1″	9.47

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-17156-b · Registry entry updated 2026-08-14.