ExoClock

The Star
Simbad GAIA 2MASS	HD 201585 DR2 1744911763437512064 J21101237+1044197
RA	21:10:12.3723		DEC	+10:44:19.944
Parallax 5.458 mas		P.M. RA -5.719 mas/y		P.M. DEC 5.379 mas/y
Mag_V 8.27	Mag_R^* 8.138	Mag_I^* 7.986	Mag_J 7.819	Mag_H 7.749	Mag_K 7.74
Mag_G 8.242		Mag_{G_BP} 8.367		Mag_{G_RP} 8.052
^*Calculated from GAIA magnitudes.

Ephemeris - Verified
Kokori et al. 2025
Mid-time 2459815.476045 ± 9.5e-05 BJD_TDB
Period 2.1487719 ± 1.9e-06 days
Transit Parameters
Talens et al. 2017
R_p/R_s 0.0735 ± 0.0007	a/R_s^** 4.187 +0.036 -0.036		i 87.0 +2.0 -3.0 deg
R_p/R_s 0.0735 ± 0.0007	e -		ω - deg
Depth_R^* 6.83 mmag		Duration^* 4.17 hours
^Calculated from the other parameters, using PyLightcurve. ^*Adjusted based on the space observations.
Limb Darkening Parameters
Talens et al. 2017
T_eff 7554.0 +150.0 -150.0 K	Log(g) 4.029 +0.104 -0.097 cm/s²		Fe/H 0.0 +0.0 -0.0 dex

ExoClock Status
Observing Priority		MEDIUM
Minimum aperture		5.0"
Total Observations (Recent)		37 (2)
O-C		-0.64 ± 0.62 minutes
ExoClock Observations (Recent)		27 (2)
Space Observations (Recent)		9 (0)
ETD Observations (Recent)		0 (0)
Literature Mid-times (Recent)		1 (0)
Kepler R_p/R_s		-
TESS R_p/R_s		0.07937 ± 0.00012

Planet Observation Date	Observer Observatory	Telescope Camera / Filter / Exp [s]	O-C minutes
ExoClock Observations
MASCARA-1b (MEDIUM) 2025-09-07	Michael Nezel Celle Observatory	CDK 14 QHY 268M / R / 20.0	2.42 ± 2.59
MASCARA-1b (MEDIUM) 2025-06-28	Giovanni Calapai Home Astronomical Observatory	Celestron 11 Schmidt-Cassegrain Atik 314L+ / Clear / 90.0	-0.93 ± 2.59
MASCARA-1b (MEDIUM) 2024-09-11	Paolo Arcangelo Matassa P:M.P.H.R. Deep Sky (K81)	Ritchey Chretien 40cm-F5.3 CCD ICX453AQ / R / 20.0	4.12 ± 3.6
MASCARA-1b (MEDIUM) 2024-08-17	Laerte Andrade Observatório do Pico dos Dias	0.6m Zeiss f/12.5 Andor iKon-L CCD / R / 5.0	-6.16 ± 2.02
MASCARA-1b (MEDIUM) 2024-08-14	Paolo Arcangelo Matassa P:M.P.H.R. Deep Sky (K81)	Ritchey Chretien 40cm-F5.3 CCD ICX453AQ / R / 15.0	1.44 ± 2.59
MASCARA-1b (MEDIUM) 2024-08-02	Ramon Naves Montcabrer	Meade LX200 12" ACF Moravian G4-9000 / ipr / 120.0	2.78 ± 2.88
MASCARA-1b (MEDIUM) 2024-08-02	Alvaro Fornas MPC J57. Centro Astronómico Alto Turia	Meade LX200 Classic Moravian G2 8300 / Lum / 60.0	-2.41 ± 1.87
MASCARA-1b (MEDIUM) 2024-07-18	Miguel Ángel Álava Amat Sarriguren	Meade SC 8" Asi 1600 MM / rpr / 180.0	-0.24 ± 1.58
MASCARA-1b (MEDIUM) 2024-07-18	Robert Roth TURMX Observatory	Planewave CDK17 Moravian C1x 61000 Pro / rpr / 20.0	-0.46 ± 0.99
MASCARA-1b (MEDIUM) 2023-10-01	Lionel Rousselot Private observatory Vierzon	Newton 250/740 ZWO 533 monochrome / rpr / 30.0	-0.67 ± 1.73
MASCARA-1b (MEDIUM) 2023-10-01	Anaël Wünsche Observatoire des Baronnies Provençales	CDK Planewave 2 ZWO ASI6200 / R / 15.0	-4.84 ± 1.87
MASCARA-1b (MEDIUM) 2023-08-19	Guillaume Biesse Observatoire de la colline Tossius	Ritchey Chretien GSO ASI 533 MM - Gain=0 / rpr / 60.0	4.57 ± 2.16
MASCARA-1b (MEDIUM) 2023-08-19	Claudio Lopresti Claudio Lopresti	Mak-Newton CCD Sbig ST10xme / I / 240.0	1.26 ± 1.44
MASCARA-1b (MEDIUM) 2023-08-19	Paolo Arcangelo Matassa P:M.P.H.R. Deep Sky (K81)	Ritchey Chretien 40cm-F5.3 CCD ICX453AQ / R / 30.0	-2.34 ± 3.46
MASCARA-1b (MEDIUM) 2023-08-19	Rafa Barbera Rafa Barberá	TS OPTICS PHOTON ASI 533 MC PRO / Clear / 90.0	-3.63 ± 3.46
MASCARA-1b (MEDIUM) 2023-08-04	Mercedes Correa Montsec Observatory	RC 80 cm iKON XL / R / 20.0	-3.49 ± 1.73
MASCARA-1b (MEDIUM) 2023-07-07	Attilio Bruzzone Anxanum Observatory	LX200 ACF 10" QHY 268M / R / 30.0	4.63 ± 2.3
MASCARA-1b (MEDIUM) 2022-10-18	Jacques Michelet Claix	GSO Ritchey-Chrétien QSI-632 / R / 20.0	-1.89 ± 1.73
MASCARA-1b (MEDIUM) 2022-09-20	Claudio Lopresti Claudio Lopresti	Meade LX200 12" CCD Sbig ST9xe / R / 120.0	-1.27 ± 1.73
MASCARA-1b (MEDIUM) 2022-08-23	Josep M. Vilalta IAC80	Equatorial German mount Camelot2 / R / 20.0	3.56 ± 1.04
MASCARA-1b (MEDIUM) 2022-08-23	Alvaro Fornas Centro Astronómico Alto Turia (CAAT). MPC J57	Planewave CDK 17" Sbig STXL 11002 / V / 40.0	2.73 ± 1.43
MASCARA-1b (MEDIUM) 2022-08-23	Fran Campos Puig d'Agulles Observtory	RC14" on EQ8 German mount SBIG ST-8XME / R / 90.0	-3.81 ± 2.74
MASCARA-1b (MEDIUM) 2022-08-08	Fran Campos Puig d'Agulles Observtory	RC14" on EQ8 German mount SBIG ST-8XME / R / 90.0	1.52 ± 3.31
MASCARA-1b (MEDIUM) 2022-08-08	Anaël Wünsche Observatoire des Baronnies Provençales	CDK Planewave 2 ZWO ASI6200 / R / 60.0	-2.08 ± 1.73
MASCARA-1b (MEDIUM) 2022-08-08	Eric Miny BLOIS SOLOGNE ASTRONOMIE OBSERVATORY	Newton T305 QSI 683WS / Lum / 30.0	-3.8 ± 4.03
MASCARA-1b (MEDIUM) 2022-07-27	Josep M. Vilalta IAC80	Equatorial German mount Camelot2 / I / 20.0	3.87 ± 4.18
MASCARA-1b (MEDIUM) 2022-07-27	Josep M. Vilalta IAC80	Equatorial German mount Camelot2 / R / 20.0	-1.02 ± 2.02
Space Observations
Planet Observation Date	Mission		O-C minutes
MASCARA-1b (MEDIUM) 2022-09-01	TESS		-0.28 ± 0.3
MASCARA-1b (MEDIUM) 2022-08-28	TESS		0.36 ± 0.3
MASCARA-1b (MEDIUM) 2022-08-26	TESS		0.15 ± 0.27
MASCARA-1b (MEDIUM) 2022-08-23	TESS		0.27 ± 0.32
MASCARA-1b (MEDIUM) 2022-08-21	TESS		-0.23 ± 0.29
MASCARA-1b (MEDIUM) 2022-08-19	TESS		-0.3 ± 0.3
MASCARA-1b (MEDIUM) 2022-08-11	TESS		0.05 ± 0.29
MASCARA-1b (MEDIUM) 2022-08-08	TESS		0.31 ± 0.3
MASCARA-1b (MEDIUM) 2022-08-06	TESS		-0.37 ± 0.3
Literature Mid-times
Planet Observation Date	Reference		O-C minutes
2015-03-15	Bell et al. 2021		-0.85 ± 2.88

MASCARA-1b (MEDIUM)

Discovered by: Talens et al. 2017

ExoClock Observations

Space Observations

Literature Mid-times