ExoClock

The Star
Simbad GAIA 2MASS	BD+34 1976 DR2 702295464353437952 J09202471+3352567
RA	09:20:24.7143		DEC	+33:52:56.699
Parallax 4.367 mas		P.M. RA -2.155 mas/y		P.M. DEC -20.319 mas/y
Mag_V 10.42	Mag_R^* 10.17	Mag_I^* 9.767	Mag_J 9.442	Mag_H 9.182	Mag_K 9.119
Mag_G 10.38		Mag_{G_BP} 10.692		Mag_{G_RP} 9.935
^*Calculated from GAIA magnitudes.

Ephemeris - Verified
Kokori et al. 2025
Mid-time 2457473.42766 ± 0.00023 BJD_TDB
Period 4.35301099 ± 5.4e-07 days
Transit Parameters
Skillen et al. 2009
R_p/R_s 0.0933 ± 0.0021	a/R_s 8.51 +0.21 -0.21		i 86.9 +1.6 -1.2 deg
R_p/R_s 0.0933 ± 0.0021	e -		ω - deg
Depth_R^* 10.97 mmag		Duration^* 3.89 hours
^Calculated from the other parameters, using PyLightcurve. ^*Adjusted based on the space observations.
Limb Darkening Parameters
Skillen et al. 2009
T_eff 5826.0 +100.0 -100.0 K	Log(g) 4.04 +0.2 -0.2 cm/s²		Fe/H 0.0 +0.2 -0.2 dex

ExoClock Status
Observing Priority		LOW
Minimum aperture		5.0"
Total Observations (Recent)		46 (4)
O-C		1.27 ± 0.54 minutes
ExoClock Observations (Recent)		23 (4)
Space Observations (Recent)		7 (0)
ETD Observations (Recent)		10 (0)
Literature Mid-times (Recent)		6 (0)
Kepler R_p/R_s		-
TESS R_p/R_s		0.09152 ± 0.00035

Planet Observation Date	Observer Observatory	Telescope Camera / Filter / Exp [s]	O-C minutes
ExoClock Observations
WASP-13b (LOW) 2026-03-13	Ivo Silvestri Trevinca Skies	Skywatcher Newton 250pds ASI2600MM Duo / rpr / 60.0	1.95 ± 2.16
WASP-13b (LOW) 2026-03-13	Manfred Raetz privat observatory Herges-Hallenberg	SCT 280/1850 (C11 with Starizona reducer) Moravian Instruments G2-1600 / R / 240.0	-1.94 ± 2.3
WASP-13b (LOW) 2026-01-11	Patrick Farizy Private Observatory , France	Celestron 8 Schmidt-Cassegrain ToupTek G3CMOS585C / Clear / 45.0	1.3 ± 1.73
WASP-13b (LOW) 2025-12-29	Manfred Raetz privat observatory Herges-Hallenberg	SCT 280/1850 (C11 with Starizona reducer) Moravian Instruments G2-1600 / R / 120.0	1.12 ± 0.88
WASP-13b (LOW) 2025-02-27	Bryan Martin Tiger Butte Observatory Remote	AG Optical IDK ZWO ASI 294 / R / 120.0	2.6 ± 6.05
WASP-13b (LOW) 2025-02-22	Simon Dawes William James II	Celestron Edge11 HD Risingcam Monochrome SONY imx571 / Lum / 60.0	2.04 ± 2.16
WASP-13b (LOW) 2025-02-22	John Collins JC_Wrexham	Meade LX200GPS ASI-290m / Lum / 30.0	1.9 ± 2.88
WASP-13b (LOW) 2024-11-27	Alexey Garmash Lyceum 130	EdgeHD C11 ASI2600MM pro / rpr / 120.0	1.64 ± 0.99
WASP-13b (LOW) 2024-01-15	Adrian Jones Private Observatory (I64)	Meade ACF 30cm QSI 583 / R / 60.0	-1.52 ± 2.02
WASP-13b (LOW) 2023-12-20	Martin Crow Burnham Observatory	Celestron C9.25 SX694 mono / R / 40.0	-4.45 ± 1.58
WASP-13b (LOW) 2023-02-27	David Bennett Rickford Observatory	GSO RC ZWO ASI2600MM Pro / R / 90.0	0.22 ± 2.88
WASP-13b (LOW) 2023-02-27	David Wright Yorick (private observatory)	10" Ritchey-Chretien QSI 683WSG-8 / R / 90.0	-0.07 ± 2.59
WASP-13b (LOW) 2023-02-27	Eric Miny BLOIS SOLOGNE ASTRONOMIE OBSERVATORY	Newton T305 QSI 683WS / R / 60.0	-3.23 ± 4.03
WASP-13b (LOW) 2023-02-13	Simon Dawes William James II Observatory	Skywatcher MN190 2 ZWO ASI 1600MM-PRO USB 3.0 Mono Camera / R / 300.0	1.71 ± 3.46
WASP-13b (LOW) 2022-02-08	Giuseppe Conzo Explorer Orbanić Observatory	Newton GSO Truss 254mm F/3.8 Atik 414 Ex Mono / R / 60.0	-2.42 ± 3.02
WASP-13b (LOW) 2022-01-26	Jean-Bernard Pioppa La Roque-Esclapon	KEPLER ATIK 383 L+ / R / 60.0	4.26 ± 4.32
WASP-13b (LOW) 2022-01-05	Martin Crow Burnham Observatory	Celestron C9.25 SX694 mono / R / 45.0	3.33 ± 1.15
WASP-13b (LOW) 2022-01-05	David Wright Yorick (private observatory)	10" Ritchey-Chretien QSI 683WSG-8 / R / 90.0	2.32 ± 2.3
WASP-13b (LOW) 2022-01-05	Adrian Jones Private Observatory (I64)	Meade ACF 30cm QSI 583 / R / 100.0	1.45 ± 1.01
WASP-13b (LOW) 2022-01-05	Simon Dawes William James II Observatory	Skywatcher MN190 2 ZWO ASI 1600MM-PRO USB 3.0 Mono Camera / R / 120.0	-2.87 ± 3.17
WASP-13b (LOW) 2021-02-03	David Wright Yorick (private observatory)	10" Ritchey-Chretien QSI 683WSG-8 / R / 120.0	1.66 ± 2.59
WASP-13b (LOW) 2020-04-13	Manfred Raetz privat observatory Herges-Hallenberg	SCT 280 /1790 (Celestron C11 with reducer) Moravian Instruments G2-1600 / R / 120.0	0.15 ± 1.87
WASP-13b (LOW) 2012-01-19	Ramon Naves Montcabrer	Meade LX200 12" ACF Sbig ST8xme / R / 120.0	-2.31 ± 1.73
Space Observations
Planet Observation Date	Mission		O-C minutes
WASP-13b (LOW) 2020-02-17	TESS		1.56 ± 0.79
WASP-13b (LOW) 2020-02-13	TESS		0.53 ± 0.78
WASP-13b (LOW) 2020-02-08	TESS		-0.15 ± 0.76
WASP-13b (LOW) 2020-02-04	TESS		-0.98 ± 0.76
WASP-13b (LOW) 2020-01-30	TESS		0.09 ± 0.75
WASP-13b (LOW) 2020-01-26	TESS		-0.13 ± 0.66
WASP-13b (LOW) 2020-01-22	TESS		-2.07 ± 0.88
ETD Observations
Planet Observation Date	Observer(s)	ETD link	O-C minutes
WASP-13b (LOW) 2019-02-21	Pere Guerra	1550936774	-2.94 ± 1.01
WASP-13b (LOW) 2019-01-04	Fran Campos	1546645101	2.85 ± 1.44
WASP-13b (LOW) 2014-03-16	Mark Salisbury	1395472915	-2.0 ± 1.58
WASP-13b (LOW) 2013-03-29	Stan Shadick	1364601609	2.45 ± 2.59
WASP-13b (LOW) 2012-02-05	Stan Shadick	1333061293	1.66 ± 1.58
WASP-13b (LOW) 2011-03-07	Stan Shadick and Colleen Ambler	1311537343	3.46 ± 1.44
WASP-13b (LOW) 2011-02-17	Veli-Pekka Hentunen	1298012292	4.67 ± 2.02
WASP-13b (LOW) 2010-02-25	Tomáš Hynek	1267160891	2.51 ± 1.58
WASP-13b (LOW) 2010-02-04	Jaroslav Trnka	1265269530	-0.0 ± 3.02
WASP-13b (LOW) 2009-12-26	Hana Kučáková	1261887802	-2.16 ± 2.59
Literature Mid-times
Planet Observation Date	Reference		O-C minutes
2011-01-14	Barros et al. 2012		1.22 ± 0.73
2010-02-04	Barros et al. 2012		-2.22 ± 0.65
2009-05-05	Barros et al. 2012		-4.27 ± 0.85
2009-01-30	Barros et al. 2012		0.7 ± 0.7
2008-02-16	Barros et al. 2012		3.19 ± 1.37
2008-01-26	Skillen et al. 2009		2.55 ± 1.01

WASP-13b (LOW)

Discovered by: Skillen et al. 2009

ExoClock Observations

Space Observations

ETD Observations

Literature Mid-times