ExoClock

The Star
Simbad GAIA 2MASS	HD 287325 DR2 3291455819447952768 J04581255+0959527
RA	04:58:12.5627		DEC	+09:59:52.803
Parallax 2.996 mas		P.M. RA -2.657 mas/y		P.M. DEC -4.996 mas/y
Mag_V 9.47	Mag_R^* 9.363	Mag_I^* 9.227	Mag_J 9.068	Mag_H 9.023	Mag_K 8.963
Mag_G 9.452		Mag_{G_BP} 9.554		Mag_{G_RP} 9.289
^*Calculated from GAIA magnitudes.

Ephemeris - Verified
Kokori et al. 2025
Mid-time 2459133.8879 ± 0.00015 BJD_TDB
Period 2.7443188 ± 1.5e-06 days
Transit Parameters
Zhou et al. 2019
R_p/R_s 0.09887 ± 0.00133	a/R_s^** 5.31 +0.06 -0.06		i 83.5 +0.91 -1.42 deg
R_p/R_s 0.09887 ± 0.00133	e -		ω - deg
Depth_R^* 11.4 mmag		Duration^* 3.67 hours
^Calculated from the other parameters, using PyLightcurve. ^*Adjusted based on the space observations.
Limb Darkening Parameters
Zhou et al. 2019
T_eff 8450.0 +540.0 -690.0 K	Log(g) 4.18 +0.06 -0.06 cm/s²		Fe/H -0.059 +0.075 -0.088 dex

ExoClock Status
Observing Priority		LOW
Minimum aperture		5.0"
Total Observations (Recent)		23 (3)
O-C		0.42 ± 0.75 minutes
ExoClock Observations (Recent)		13 (3)
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		0.09383 ± 0.00032

Planet Observation Date	Observer Observatory	Telescope Camera / Filter / Exp [s]	O-C minutes
ExoClock Observations
HAT-P-70b (LOW) 2025-12-17	Giovanni Calapai Home Astronomical Observatory	Celestron 11 Schmidt-Cassegrain Atik 314L+ / Clear / 90.0	-0.68 ± 1.73
HAT-P-70b (LOW) 2025-10-24	Adrian Jones Private Observatory (I64)	Meade ACF 30cm QSI 583 / R / 45.0	-0.71 ± 1.58
HAT-P-70b (LOW) 2025-01-06	Yves Jongen Deep Sky Chile	Plane Wave CDK 17" Moravian 4G / R / 15.0	-3.75 ± 3.46
HAT-P-70b (LOW) 2024-12-06	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / R / 60.0	5.48 ± 2.02
HAT-P-70b (LOW) 2024-11-26	Anis Ben Lassoued Sousse Observatory	NEWTON SKY WATCHER ASI 533 MM / R / 120.0	5.15 ± 3.02
HAT-P-70b (LOW) 2024-11-23	Bryan Martin Tiger Butte Observatory Remote	AG Optical IDK ZWO ASI 294 / I / 120.0	0.28 ± 4.9
HAT-P-70b (LOW) 2024-01-31	Guillaume Biesse Observatoire de la colline Tossius	Ritchey Chretien GSO ASI 533 MM - Gain=0 / Lum / 30.0	-4.28 ± 1.58
HAT-P-70b (LOW) 2024-01-20	Zlatko Orbanić Explorer	Newton Truss 254mm F/3.8 Atik 414 Ex Mono / rpr / 20.0	8.21 ± 2.45
HAT-P-70b (LOW) 2023-01-20	Miguel Ángel Álava Amat Sarriguren	Meade SC 8" Asi 1600 MM / rpr / 180.0	4.04 ± 2.16
HAT-P-70b (LOW) 2023-01-09	Simon Dawes William James II Observatory	Skywatcher MN190 2 ZWO ASI 1600MM-PRO USB 3.0 Mono Camera / R / 180.0	-3.34 ± 3.74
HAT-P-70b (LOW) 2022-11-05	Martin Crow Burnham Observatory	Celestron C9.25 SX694 mono / R / 20.0	-0.24 ± 2.88
HAT-P-70b (LOW) 2022-11-05	Mark van der Grijp Trevinca Observatory	William Optics FLT132 ZWO ASI2600mm Pro / Lum / 30.0	-3.12 ± 1.73
HAT-P-70b (LOW) 2022-01-20	Robert Roth TURMX Observatory	Planewave CDK17 QHY600M / rpr / 10.0	1.16 ± 1.73
Space Observations
Planet Observation Date	Mission		O-C minutes
HAT-P-70b (LOW) 2020-12-16	TESS		-1.33 ± 0.94
HAT-P-70b (LOW) 2020-12-13	TESS		-0.59 ± 0.72
HAT-P-70b (LOW) 2020-12-10	TESS		0.7 ± 0.63
HAT-P-70b (LOW) 2020-12-08	TESS		-0.34 ± 0.81
HAT-P-70b (LOW) 2020-12-05	TESS		-0.02 ± 0.69
HAT-P-70b (LOW) 2020-11-29	TESS		-0.06 ± 0.75
HAT-P-70b (LOW) 2020-11-27	TESS		0.3 ± 0.71
HAT-P-70b (LOW) 2020-11-24	TESS		0.19 ± 0.69
HAT-P-70b (LOW) 2020-11-21	TESS		0.54 ± 0.66
Literature Mid-times
Planet Observation Date	Reference		O-C minutes
2018-11-17	Zhou et al. 2019		-0.08 ± 0.65

HAT-P-70b (LOW)

Discovered by: Zhou et al. 2019

ExoClock Observations

Space Observations

Literature Mid-times