A significant mutual inclination between the planets within the π Mensae system

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Table 1

Astrometric measurements of the photocenter of the π Mensae system.

Property	Value	Error	Unit
HIPPARCOS (1991.25) - HIP 26394

α	84.28663594	0.20	deg, mas^(a,b)
δ	− 80.47167440	0.20	deg, mas^(a)
ϖ	54.60	0.21	mas
	312.01	0.24	mas yr⁻¹
μ_δ	1050.38	0.26	mas yr⁻¹

Gaia (2015.50) - Gaia DR2 4623036865373793408

α	84.29927749888	0.3507	deg, mas^(a,b)
δ	− 80.46460401033	0.1772	deg, mas^(a)
ϖ	54.7052	0.0754	mas
	311.246	0.148	mas yr⁻¹
μ_δ	1048.908	0.159	mas yr⁻¹

Notes. ^(a) Value in degrees, uncertainty in milliarcseconds. ^(b)Uncertainty in α^⋆ = α cosδ.

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