The GAPS programme at TNG - LXXI. A sub-Neptune suitable for atmospheric characterization in a multiplanet and mutually inclined system orbiting the bright K dwarf TOI-5789 (HIP 99452)

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Volume 707 (March 2026)

A&A, 707 (2026) A197

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Table 1

Stellar parameters.

Parameter	Value	Source
Identifiers
TOI	5789	TOI catalog
TIC	87216634	TIC
HIP	99452	HIP
Tycho-2	1618-00827-1	Tycho-2
2MASS	J20110609+1611162	2MASS
Gaia	1809360187275432832	Gaia DR3

Coordinates, motion, and distance

Right ascension α (J2000.0) [h]	20:11:06.07	Gaia DR3
Declination δ (J2000.0) [deg]	+16:11:16.79	Gaia DR3
Parallax π [mas]	48.9262 ± 0.0230	Gaia DR3
Proper motion μ_α cos δ [mas yr⁻¹]	−415.062 ± 0.020	Gaia DR3
Proper motion μ_δ [mas yr⁻¹]	398.487 ± 0.015	Gaia DR3
Galactic velocity U⁽¹⁾ [km s⁻¹]	31.376 ± 0.0026	This work
Galactic velocity V⁽¹⁾ [km s⁻¹]	−26.883 ± 0.0065	This work
Galactic velocity W⁽¹⁾ [km s⁻¹]	61.910 ± 0.0254	This work
Distance d [pc]	20.4392 ± 0.0095	This work

Magnitudes

B_T	8.373 ± 0.017	Tycho-2
V_T	7.422 ± 0.011	Tycho-2
B	8.155 ± 0.017	APASS Johnson
V	7.299 ± 0.006	APASS Johnson
g′	7.825 ± 0.118	APASS Sloan
r′	7.064 ± 0.023	APASS Sloan
G	7.1130 ± 0.0028	Gaia DR3
J	5.826 ± 0.030	2MASS
H	5.421 ± 0.021	2MASS
K_S	5.350 ± 0.024	2MASS
W1	5.296 ± 0.166	AllWISE
W2	5.218 ± 0.068	AllWISE
W3	5.341 ± 0.015	AllWISE
W4	5.285 ± 0.032	AllWISE
A_V	<0.057	This work⁽²⁾

Stellar parameters

Spectral type	K1 V
Luminosity L_⋆ [L_⊙]	0.469 ± 0.017	This work⁽²⁾
Mass M_⋆ [M_⊙]	${0.821}_{- 0.027}^{+ 0.032}$ $Mathematical equation: $0.821_{ - 0.027}^{ + 0.032}$$	This work⁽²⁾
Radius R_⋆ [R_⊙]	0.833 ± 0.023	This work⁽²⁾
Effective temperature T_eff [K]	5185 ± 80	This work⁽³⁾
Metallicity [Fe/H] [dex]	−0.12 ± 0.08	This work⁽³⁾
Magnesium abundance [Mg/H] [dex]	0.05 ± 0.07	This work⁽³⁾
Silicon abundance [Si/H] [dex]	−0.03 ± 0.07	This work⁽³⁾
Micro-turbulent velocity V_mic [km s⁻¹]	0.97 ± 0.04	This work⁽³⁾
Surface gravity log g_⋆ [cgs]	4.51 ± 0.15	This work⁽³⁾
Surface gravity log g_⋆ [cgs]	${4.511}_{- 0.024}^{+ 0.026}$ $Mathematical equation: $4.511_{ - 0.024}^{ + 0.026}$$	This work⁽²⁾
Density ρ_⋆ [g cm⁻³]	${2.00}_{- 0.15}^{+ 0.17}$ $Mathematical equation: $2.00_{ - 0.15}^{ + 0.17}$$	This work⁽²⁾
Activity index log R′_HK [dex]	-5.153 ± 0.003	This work⁽³⁾
Age t [Gyr]	${9.4}_{- 3.5}^{+ 2.0}$ $Mathematical equation: $9.4_{ - 3.5}^{ + 2.0}$$	This work⁽²⁾

Notes. – TESS Primary Mission TOI catalog (Guerrero et al. 2021); TIC (Stassun et al. 2018; Stassun et al. 2019); HIP (Perryman et al. 1997); Tycho-2 (Høg et al. 2000); APASS (Henden et al. 2016); Gaia DR3 (Gaia Collaboration 2023); 2MASS (Cutri et al. 2003); AllWISE (Cutri et al. 2021).¹ Galactic velocity components, where U is positive toward the Galactic anticenter, V in the direction of the Galactic rotation, and W toward the Galactic north pole.² From the EXOFASTv2 modeling.³ From the HARPS-N spectral analysis.

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