exoclock

HAT-P-38b (LOW)

Discovered by: Sato et al. 2012

The Star
Simbad
GAIA
2MASS		 HAT-P-38
DR2 324889227693298560
J02213197+3214461
RA 02:21:31.9802 DEC +32:14:46.090
Parallax
3.89 mas		 P.M. RA
47.771 mas/y		 P.M. DEC
-21.428 mas/y
MagV
12.51		 MagR
12.36		 MagI*
11.585		 MagJ
10.989		 MagH
10.593		 MagK
10.501
MagG
12.302		 MagGBP
12.765		 MagGRP
11.699
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2457733.172866 ± 8.8e-05 BJDTDB
Period
4.6403274 ± 5e-07 days
Transit Parameters
Sato et al. 2012
Rp/Rs
0.0918 ± 0.0016		 a/Rs
12.2 +1.0 -1.0
 i
88.3 +0.7 -0.7 deg
e
0.07 +0.05 -0.05
 ω
240.0 +104.0 -104.0 deg
DepthR*
10.97 mmag		 Duration*
3.16 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Sato et al. 2012
Teff
5330.0 +100.0 -100.0 K
 Log(g)
4.46 +0.1 -0.1 cm/s2
 Fe/H
0.06 +0.1 -0.1 dex
ExoClock Status
Observing Priority LOW
Minimum aperture 7.4"
Total Observations (Recent) 42 (8)
O-C 1.6 ± 0.54 minutes
ExoClock Observations (Recent) 30 (8)
Space Observations (Recent) 6 (0)
ETD Observations (Recent) 2 (0)
Literature Mid-times (Recent) 4 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.09323 ± 0.00099

HAT-P-38b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
HAT-P-38b (LOW)
2026-01-05		Trevor Gainey
Kismet		Meade LX200
ZWO ASI 294 MC Pro / R / 90.0		5.86 ± 3.02
HAT-P-38b (LOW)
2026-01-05		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 200.0		5.14 ± 2.88
HAT-P-38b (LOW)
2026-01-05		Matthieu Bachschmidt
Gonachon		Celestron C11
SBIG ST8XME / AstrodonExoPlanet-BB / 90.0		3.27 ± 1.87
HAT-P-38b (LOW)
2026-01-05		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 180.0		3.27 ± 1.44
HAT-P-38b (LOW)
2026-01-05		Kevin Johnson
Holbrook Observatory		Meade LX50 10"
Atik 383L+ / R / 180.0		-2.78 ± 3.02
HAT-P-38b (LOW)
2025-12-09		Jacques Michelet
Claix		GSO Ritchey-Chrétien
Poseidon-M Pro / rpr / 150.0		3.65 ± 2.59
HAT-P-38b (LOW)
2025-10-05		Jordi González-Edo
Landete-Kea		C11
ASI 2600MM pro / Lum / 80.0		4.49 ± 1.87
HAT-P-38b (LOW)
2025-10-05		samuel Diaz Lopez
Tomas Lopez (AstroCamp)		SCA260
ASI2600MM / AstrodonExoPlanet-BB / 152.0		0.17 ± 1.73
HAT-P-38b (LOW)
2024-11-04		Gustavo Muler
Obs. Nazaret J47		lx 200
ST8 XME AO8 / R / 90.0		-1.6 ± 1.44
HAT-P-38b (LOW)
2024-10-22		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 200.0		-0.18 ± 2.02
HAT-P-38b (LOW)
2024-08-31		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 120.0		0.76 ± 1.41
HAT-P-38b (LOW)
2024-08-18		Alvaro Fornas
MPC J57. Centro Astronómico Alto Turia		Planewave CDK 17
QHY600M / Lum / 180.0		1.81 ± 1.87
HAT-P-38b (LOW)
2024-01-26		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 200.0		6.14 ± 2.02
HAT-P-38b (LOW)
2024-01-26		Martin Crow
Burnham Observatory		Celestron C9.25
SX694 mono / R / 200.0		-2.5 ± 3.6
HAT-P-38b (LOW)
2023-09-05		Simon Dawes
William James II		Celestron Edge11 HD
Risingcam Monochrome SONY imx571 / Lum / 300.0		0.88 ± 3.17
HAT-P-38b (LOW)
2023-09-05		David Wright
Yorick (private observatory)		10" Ritchey-Chretien
QSI 683WSG-8 / R / 240.0		0.31 ± 2.74
HAT-P-38b (LOW)
2023-09-05		Pieter Vuylsteke
TheGardenToTheSkyFacility		TS ONTC 25cm f4.7
QHY 268M / rpr / 150.0		-0.85 ± 2.45
HAT-P-38b (LOW)
2022-12-09		Kevin Johnson
Holbrook Observatory		Meade LX10 EMC
Atik 383L+ / R / 240.0		-2.3 ± 4.61
HAT-P-38b (LOW)
2022-11-12		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280 /1790 (Celestron C11 with reducer)
Moravian Instruments G2-1600 / AstrodonExoPlanet-BB / 120.0		2.11 ± 7.63
HAT-P-38b (LOW)
2022-10-29		Pierre Gamache
Observatoire de la Licorne		RC
ASI6200MM / R / 120.0		3.38 ± 4.46
HAT-P-38b (LOW)
2022-10-05		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 120.0		3.15 ± 4.32
HAT-P-38b (LOW)
2022-10-05		Martin Crow
Burnham Observatory		Celestron C9.25
SX694 mono / R / 120.0		0.55 ± 2.02
HAT-P-38b (LOW)
2022-10-05		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 200.0		-1.95 ± 1.37
HAT-P-38b (LOW)
2022-09-22		Matthieu Bachschmidt
Gonachon		Celestron C11
SBIG ST8XME / AstrodonExoPlanet-BB / 60.0		0.96 ± 1.87
HAT-P-38b (LOW)
2021-11-05		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave 2
ZWO ASI6200 / Clear / 120.0		-1.07 ± 1.58
HAT-P-38b (LOW)
2021-10-08		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280 /1790 (Celestron C11 with reducer)
Moravian Instruments G2-1600 / Clear / 120.0		-0.98 ± 0.86
HAT-P-38b (LOW)
2020-10-25		Danilo Sedita
Osservatorio Sedita Castrofilippo		RC GSO 14"
Moravian G2-1600 / R / 60.0		1.55 ± 2.02
HAT-P-38b (LOW)
2020-10-25		Carmelo Falco
GALHassin Robotic Telescope 2 (GRT2)		Giacometti-Fogale RC16
Andor Apogee Aspen CG16M / Lum / 60.0		-0.03 ± 1.73
HAT-P-38b (LOW)
2017-10-22		Steven Peterson
Vail View Observatory H18		RCOS 14.5" f/ 7.9
SBIG STL-1301E / AstrodonExoPlanet-BB / 120.0		-0.85 ± 1.17
HAT-P-38b (LOW)
2016-10-29		Anaël Wünsche
Observatoire des Baronnies Provençales		Astelco
FLIPL230 / Lum / 120.0		-2.19 ± 1.3

Space Observations
Planet
Observation Date		 Mission O-C
minutes
HAT-P-38b (LOW)
2022-11-25		TESS-0.02 ± 1.73
HAT-P-38b (LOW)
2022-11-21		TESS-0.27 ± 1.58
HAT-P-38b (LOW)
2022-11-16		TESS-0.09 ± 1.44
HAT-P-38b (LOW)
2022-11-12		TESS-1.2 ± 1.58
HAT-P-38b (LOW)
2022-11-07		TESS3.3 ± 1.58
HAT-P-38b (LOW)
2022-11-02		TESS-2.17 ± 1.35

ETD Observations
Planet
Observation Date		 Observer(s) ETD link O-C
minutes
HAT-P-38b (LOW)
2021-11-05		Yves Jongen16363247971.8 ± 1.38
HAT-P-38b (LOW)
2021-10-08		F. Lomoz16337636151.62 ± 2.3

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2017-09-29 Mallonn et al. 2019 -1.17 ± 2.15
2016-08-25 Bruno et al. 2018 0.09 ± 0.14
2016-03-02 Bruno et al. 2018 1.23 ± 0.65
2011-10-28 Sato et al. 2012 -0.84 ± 0.5
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