MASCARA-1b
{{Short description|Exoplanet in Equuleus}}
{{Infobox planet
|name=MASCARA-1b
|discovery_method=
|discovered= 17 July 2017
|discoverer= MASCARA
|semimajor= 0.040352 AU
|period= 2.1 d
|inclination=
|star= MASCARA-1
|mean_radius= 1.597 {{Jupiter radius|link=y}}
|mass= 3.7 {{Jupiter mass|link=y}}
|density =
|single_temperature=3062 K
}}
MASCARA-1b is a confirmed superjovian exoplanet, orbiting the A-type star MASCARA-1 (HD 201585).
Characteristics
MASCARA-1b is a hot Jupiter transiting its parent A-type star; its orbit is misaligned with the star's rotation. The planet was found unusually reflective for hot Jupiter with the measured geometric albedo of 0.171{{±|0.066|0.068}} and dayside temperature of 3062{{±|66|68}} K.{{citation|arxiv=2109.05031|year=2021|title=Spi-OPS:Spitzer and CHEOPS confirm the near-polar orbit of MASCARA-1b and reveal a hint of dayside reflection}} Attempts to spectroscopically characterize its composition were failing as in 2022 due to relatively high planetary surface gravity resulting in compact atmosphere.{{citation|arxiv=2206.09443|year=2022|title=Transmission spectroscopy of MASCARA-1b with ESPRESSO:Challenges of overlapping orbital and Doppler tracks}}