TEPCat: HD 17156

This page summarises the information held within TEPCat for the transiting planetary system HD 17156. Please see here for descriptions of the quantities given below.

Discovery and basic observable quantities:
Quantity	Value	Unit
Reference of discovery paper	2007A+A...476L..13B
Date of discovery paper	2007 / 10 / 4	y / m / d
Data/telescope used for discovery	other
Right ascension	02 49 44.49	h m s
Declination	+71 45 11.6	d m s
Right ascension (decimal)	42.43537	degrees
Declination (decimal)	71.75322	degrees
V-band apparent magnitude	8.17	mag
K-band apparent magnitude	6.76	mag
Transit duration	0.13127 ( 3.1505 )	day hour
Transit depth	0.6	%
Time of mid-transit	2458809.07307 ± 0.00021	HJD or BJD
Orbital period	21.2164294 ± 0.0000061	days
Reference for orbital ephemeris	2023AJ....165..252K

Physical properties from the most recent detailed study:
Quantity	Value	Unit
Stellar effective temperature	6046 +76 −72	K
Stellar metal abundance ([Fe/H] or [M/H])	+0.208 ± 0.058	dex
Stellar mass	1.285 +0.064 −0.082	Msun
Stellar radius	1.517 +0.038 −0.036	Rsun
Stellar logarithmic surface gravity	4.207 ± 0.018	c.g.s.
Stellar mean density	0.366 +0.028 −0.025 ( 0.516 +0.040 −0.035 )	ρsun g cm^-3
Orbital eccentricity	0.6772 +0.0045 −0.0044
Orbital semimajor axis	0.1632 ± 0.0027	AU
Planetary mass	3.26 ± 0.11 ( 1036 ± 34 )	Mjup Mearth
Planetary radius	1.094 +0.031 −0.030 ( 12.26 + 0.35 − 0.34 )	Rjup Rearth
Planetary surface gravity	67.5 +3.8 −3.6 3.83 +0.02 −0.02	m/s2 log(cgs)
Planetary mean density	2.32 +0.20 −0.17 ( 3.08 +0.27 −0.23 )	ρjup g cm^-3
Planetary equilibrium temperature	888 +12 −11	K
Reference of detailed study	2023AJ....165..252K

Entries in the catalogue of orbital obliquity measurements:
Reference	λ (degrees)
Narita et al. (2008)	62 ± 25
Cochran et al. (2008)	9.4 ± 9.3
Barbieri et al. (2009)	−4.8 ± 5.3
Narita et al. (2009)	10.0 ± 5.1

Page generated on 2026/01/29 John Southworth (Keele University, UK)