exoclock

WASP-39b (LOW)

Discovered by: Faedi et al. 2011

The Star
Simbad
GAIA
2MASS		 WASP-39
DR2 3643098875168270592
J14291840-0326403
RA 14:29:18.4151 DEC -03:26:40.203
Parallax
4.645 mas		 P.M. RA
-19.053 mas/y		 P.M. DEC
0.345 mas/y
MagV
12.09		 MagR
12.17		 MagI
11.29		 MagJ
10.663		 MagH
10.307		 MagK
10.202
MagG
11.887		 MagGBP
12.306		 MagGRP
11.326
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2459661.843065 ± 2.2e-05 BJDTDB
Period
4.05528028 ± 1.4e-07 days
Transit Parameters
Maciejewski et al. 2016
Rp/Rs
0.1457 ± 0.0016		 a/Rs
11.37 +0.24 -0.2
 i
87.75 +0.27 -0.2 deg
e
-		 ω
- deg
DepthR*
27.26 mmag		 Duration*
2.88 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Faedi et al. 2011
Teff
5400.0 +150.0 -150.0 K
 Log(g)
4.498 +0.024 -0.024 cm/s2
 Fe/H
-0.12 +0.1 -0.1 dex
ExoClock Status
Observing Priority LOW
Minimum aperture 6.02"
Total Observations (Recent) 48 (3)
O-C -0.87 ± 0.71 minutes
ExoClock Observations (Recent) 25 (3)
Space Observations (Recent) 3 (0)
ETD Observations (Recent) 11 (0)
Literature Mid-times (Recent) 9 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.14483 ± 0.00086

WASP-39b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
WASP-39b (LOW)
2026-05-13		Mark van der Grijp
Raspay Observatory		C9.25 HD
ZWO2600 MM Pro / R / 80.0		-1.11 ± 1.25
WASP-39b (LOW)
2026-05-09		Hans Leipold
Hans		Edge HD 9.25
ASI2400 / Clear / 189.0		1.4 ± 2.59
WASP-39b (LOW)
2026-04-27		Hao-Yuan Duan
Lulin Observatory		GSO RC12
player one / I / 30.0		-3.58 ± 1.73
WASP-39b (LOW)
2025-05-13		Sacha Foschino
Observatoire des Baronnies Provençales		Planewave 430mm
SVO ASI 6200 MM Pro / R / 120.0		0.17 ± 1.44
WASP-39b (LOW)
2025-03-26		Darryl Madison
Ajijic Observatory		Celestron CPC 800 Edge HD
ZWO2400MC / Clear / 90.0		-0.32 ± 1.58
WASP-39b (LOW)
2024-04-27		Alexey Garmash
Lyceum 130		EdgeHD C11
ASI2600MM pro / R / 180.0		1.17 ± 1.12
WASP-39b (LOW)
2024-03-22		Darryl Madison
Ajijic Observatory		Celestron CPC 800 Edge HD
ZWO2400MC / Clear / 120.0		-1.46 ± 2.02
WASP-39b (LOW)
2023-05-10		Dominique DANIEL
La Montjoie		T250 Skyvision
Camera CMOS ZWO ASI2600MC pro (color) / Clear / 90.0		1.51 ± 1.87
WASP-39b (LOW)
2023-05-10		Javier Flores Martín
CAHA		GSO40
zwo 1600mm pro / Lum / 30.0		-4.54 ± 1.58
WASP-39b (LOW)
2023-05-06		Tõnis Eenmäe
Tartu Observatory		Planewave CDK 12.5
Apogee Alta U42 / R / 70.0		-0.64 ± 0.96
WASP-39b (LOW)
2022-05-31		Sauro Gaudenzi
MicroObservatory Cecilia		MicroObservatory robotic telescope
KAF-1402ME / Clear / 60.0		0.39 ± 3.02
WASP-39b (LOW)
2022-05-11		Michelle Müller
TURMX Observatory		CFF Telescopes 160mm APO
ZWO ASI6200MM Pro / Lum / 120.0		1.26 ± 1.58
WASP-39b (LOW)
2022-05-11		Adam Popowicz
Otivar dome2		Newton 12" ASA
ASI ZWO 1600MM / R / 90.0		-2.78 ± 1.3
WASP-39b (LOW)
2022-05-11		Antonio Ferretti
Gruppo Astrofili Frentani - Anxanum Observatory		Meade LX200 ACF
FLI MicroLine 11002 / Clear / 60.0		-3.64 ± 1.44
WASP-39b (LOW)
2022-05-02		Claudio Lopresti
Claudio Lopresti		Makutov-Newton
CCD Sbig ST8xme / Lum / 240.0		2.78 ± 2.3
WASP-39b (LOW)
2022-04-28		Claudio Lopresti
Claudio Lopresti		Makutov-Newton
CCD Sbig ST8xme / Lum / 240.0		-1.28 ± 3.46
WASP-39b (LOW)
2022-03-31		Andre Kovacs
MicroObservatory Cecillia		152mm Maksutov
Kodak KAF-1402ME / Clear / 60.0		4.43 ± 3.46
WASP-39b (LOW)
2022-03-27		Andre Kovacs
MicroObservatory Cecillia		152mm Maksutov
Kodak KAF-1402ME / Clear / 60.0		-2.37 ± 2.74
WASP-39b (LOW)
2022-03-23		Andre Kovacs
MicroObservatory Cecillia		152mm Maksutov
Kodak KAF-1402ME / Clear / 60.0		4.23 ± 4.32
WASP-39b (LOW)
2022-03-07		Sebastien Brouillard
AstroQueyras		RC500
STX16803 / R / 180.0		1.95 ± 3.02
WASP-39b (LOW)
2021-05-02		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 120.0		1.09 ± 0.72
WASP-39b (LOW)
2021-04-28		Carmelo Falco
GALHassin Robotic Telescope 2 (GRT2)		Giacometti-Fogale RC16
Andor Apogee Aspen CG16M / Lum / 60.0		-0.95 ± 0.72
WASP-39b (LOW)
2021-03-23		Andre Kovacs
MicroObservatory Cecillia		152mm Maksutov
Kodak KAF-1402ME / Clear / 60.0		6.42 ± 2.59
WASP-39b (LOW)
2021-03-15		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 120.0		-1.41 ± 0.86
WASP-39b (LOW)
2020-05-11		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / V / 120.0		-0.98 ± 1.3

Space Observations
Planet
Observation Date		 Mission O-C
minutes
WASP-39b (LOW)
2022-05-15		TESS-1.81 ± 0.58
WASP-39b (LOW)
2022-05-06		TESS-1.13 ± 0.63
WASP-39b (LOW)
2022-05-02		TESS-0.03 ± 0.65

ETD Observations
Planet
Observation Date		 Observer(s) ETD link O-C
minutes
WASP-39b (LOW)
2020-05-27		N. Thomas & P. Liu15907886761.44 ± 1.01
WASP-39b (LOW)
2018-07-24		Team LSD15333153540.04 ± 1.44
WASP-39b (LOW)
2018-05-12		suricate4815263259212.41 ± 0.86
WASP-39b (LOW)
2017-04-29		Matthieu BACHSCHMIDT1493568620-0.09 ± 0.86
WASP-39b (LOW)
2016-04-25		Miroslav Smolka14616305070.5 ± 1.15
WASP-39b (LOW)
2016-02-29		David Molina14567294940.1 ± 1.3
WASP-39b (LOW)
2015-02-21		Martin Zíbar1424514762-1.22 ± 1.58
WASP-39b (LOW)
2014-05-21		J Garlitz1400689020-0.27 ± 1.15
WASP-39b (LOW)
2012-04-22		František Lomoz1335179151-0.11 ± 2.45
WASP-39b (LOW)
2012-02-22		Juanjo Gonzalez1329951379-1.11 ± 0.86
WASP-39b (LOW)
2011-05-14		Stan Shadick and Curtis Tuplin13120031151.51 ± 4.32

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2022-07-27 Feinstein et al. 2023 -0.04 ± 0.03
2022-07-23 Ahrer et al. 2023 0.16 ± 0.05
2016-05-04 Kirk et al. 2019 0.17 ± 0.19
2013-10-10 Barstow et al. 2017 -0.18 ± 0.35
2013-04-18 Barstow et al. 2017 -0.56 ± 0.32
2013-03-17 Barstow et al. 2017 0.02 ± 0.35
2013-02-13 Barstow et al. 2017 -0.01 ± 0.48
2013-02-08 Barstow et al. 2017 0.89 ± 0.5
2010-05-26 Faedi et al. 2011 0.05 ± 0.29
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