exoclock

GPX-1b (LOW)

Discovered by: Benni et al. 2021

The Star
Simbad
GAIA
2MASS		 2MASS J02332859+5601325
DR2 457317534880081152
J02332859+5601325
RA 02:33:28.5998 DEC +56:01:32.588
Parallax
1.499 mas		 P.M. RA
-3.252 mas/y		 P.M. DEC
0.052 mas/y
MagV*
12.319		 MagR*
12.033		 MagI*
11.754		 MagJ
11.357		 MagH
11.221		 MagK
11.181
MagG
12.223		 MagGBP
12.477		 MagGRP
11.823
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2459656.48257 ± 0.00032 BJDTDB
Period
1.74457563 ± 9.9e-07 days
Transit Parameters
Benni et al. 2021
Rp/Rs
0.095 ± 0.002		 a/Rs
4.67 +0.55 -0.32
 i
79.9 +0.7 -0.6 deg
e
-		 ω
- deg
DepthR*
9.33 mmag		 Duration*
2.12 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Benni et al. 2021
Teff
7000.0 +200.0 -200.0 K
 Log(g)
4.27 +0.05 -0.05 cm/s2
 Fe/H
0.35 +0.1 -0.1 dex
ExoClock Status
Observing Priority LOW
Minimum aperture 8.56"
Total Observations (Recent) 103 (9)
O-C -3.23 ± 0.42 minutes
ExoClock Observations (Recent) 86 (9)
Space Observations (Recent) 16 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 1 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.0878 ± 0.0022

GPX-1b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
GPX-1b (LOW)
2026-01-16		Snaevarr Guðmundsson
Ness Observatory		Meade LX 200 ACF Schmidt-Cassegrain
SBIG STL 11000M / R / 90.0		3.74 ± 2.74
GPX-1b (LOW)
2025-12-26		Jean-Claude MARIO
Observatoire de la Cabergue		T 500 Cassegrain "Arp 83"
ASI 6200 MM / Lum / 120.0		-9.35 ± 1.58
GPX-1b (LOW)
2025-11-23		Vojtěch Školník
Broumov NM Observatory		Meade LX90 ACF
MI C2-7000A / Clear / 90.0		-2.24 ± 2.02
GPX-1b (LOW)
2025-10-05		Alessandro Marchini
Astronomical Observatory University of Siena		Mak-Cas 0.3m f/5.6
Sbig STL-6303 / I / 180.0		-3.37 ± 2.59
GPX-1b (LOW)
2025-09-21		Giovanni Calapai
Home Astronomical Observatory		Celestron 11 Schmidt-Cassegrain
Atik 314L+ / AstrodonExoPlanet-BB / 90.0		-6.53 ± 1.73
GPX-1b (LOW)
2025-09-15		samuel Diaz Lopez
Tomas Lopez (AstroCamp)		SCA260
ASI2600MM / rpr / 180.0		3.12 ± 2.59
GPX-1b (LOW)
2025-09-15		Miguel Ángel Álava Amat
Sarriguren		Meade SC 8"
Asi 1600 MM / Lum / 180.0		-1.34 ± 2.3
GPX-1b (LOW)
2025-08-25		Livia Moretti
Leavitt Observatory		Ritchey-Chrétien 10'' f/8
QHY268 / R / 240.0		4.57 ± 2.02
GPX-1b (LOW)
2025-02-22		Trevor Gainey
Kismet		Meade LX200
ZWO ASI 294 MC Pro / R / 60.0		-6.89 ± 3.31
GPX-1b (LOW)
2025-01-17		Bryan Martin
Tiger Butte Observatory Remote		AG Optical IDK
ZWO ASI 294 / R / 180.0		-4.02 ± 4.75
GPX-1b (LOW)
2025-01-08		Lee YuHsien
KMSH Observatory		C14HD
QSI-660 / R / 60.0		3.86 ± 6.91
GPX-1b (LOW)
2024-12-30		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 90.0		-4.12 ± 1.05
GPX-1b (LOW)
2024-12-16		samuel Diaz Lopez
Tomas Lopez (AstroCamp)		SCA260
Atik16200MM / V / 180.0		-1.06 ± 4.03
GPX-1b (LOW)
2024-12-16		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 100.0		-5.79 ± 0.98
GPX-1b (LOW)
2024-12-02		Livia Moretti
Leavitt Observatory		Ritchey-Chrétien 10'' f/8
QHY268 / R / 240.0		6.44 ± 4.32
GPX-1b (LOW)
2024-12-02		Ivo Peretto
MarSEC Marana Space Explorer Center		R-C
Moravia G2-1600 MkII / R / 180.0		-15.59 ± 3.89
GPX-1b (LOW)
2024-12-01		Bryan Martin
Tiger Butte Observatory Remote		AG Optical IDK
ZWO ASI 294 / Lum / 180.0		-1.52 ± 5.76
GPX-1b (LOW)
2024-11-27		Lee YuHsien
KMSH Observatory		C14HD
QSI-660 / R / 60.0		-10.51 ± 2.16
GPX-1b (LOW)
2024-11-18		Mark van der Grijp
Raspay Observatory		C9.25 HD
ZWO2600 MM Pro / R / 95.0		3.57 ± 2.88
GPX-1b (LOW)
2024-11-04		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 120.0		-1.32 ± 1.04
GPX-1b (LOW)
2024-10-09		Yen-Hsing Lin
Starry House Observatory		Mewlon 300 CRS
ASI 6200MM Pro / Clear / 60.0		-0.84 ± 3.31
GPX-1b (LOW)
2024-09-18		Stéphane Montchaud
Burgundy Observatory		Celestron 8
Zwo Asi 1600 / Lum / 120.0		6.23 ± 5.62
GPX-1b (LOW)
2024-08-28		Matthieu Bachschmidt
Gonachon		Celestron C11
SBIG ST8XME / AstrodonExoPlanet-BB / 120.0		13.29 ± 4.75
GPX-1b (LOW)
2024-08-01		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 60.0		9.28 ± 4.9
GPX-1b (LOW)
2024-07-25		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 90.0		2.08 ± 5.04
GPX-1b (LOW)
2024-01-23		Attilio Bruzzone
Anxanum Observatory		LX200 ACF 10"
QHY 268M / Clear / 180.0		7.18 ± 3.46
GPX-1b (LOW)
2024-01-23		Fabio Mortari
Hypatia Observatory		Ritchey Chretienne 250mm f/5.3
MORAVIAN C2-7000A / R / 200.0		0.27 ± 5.33
GPX-1b (LOW)
2024-01-09		John Collins
JC_Wrexham		Meade LX200GPS
ASI-290m / Clear / 120.0		-3.04 ± 4.46
GPX-1b (LOW)
2023-12-26		Ramon Naves
Montcabrer		Meade LX200 12" ACF
Moravian G4-9000 / rpr / 120.0		-18.87 ± 5.76
GPX-1b (LOW)
2023-12-07		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 90.0		1.48 ± 3.17
GPX-1b (LOW)
2023-11-15		Javier Alonso Santiago
INAF-OACT		Cassegrain 91cm
Moravian C4-1600EC / R / 45.0		2.48 ± 1.44
GPX-1b (LOW)
2023-11-15		Simon Dawes
William James II		Celestron Edge11 HD
Risingcam Monochrome SONY imx571 / Lum / 299.0		-2.16 ± 1.41
GPX-1b (LOW)
2023-09-28		Miguel Ángel Álava Amat
Sarriguren		Meade SC 8"
Asi 1600 MM / Clear / 180.0		4.97 ± 2.45
GPX-1b (LOW)
2023-09-28		Javier Alonso Santiago
INAF-OACT		Cassegrain 91cm
Moravian C4-1600EC / I / 45.0		4.4 ± 2.88
GPX-1b (LOW)
2023-09-28		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 120.0		-0.5 ± 6.62
GPX-1b (LOW)
2023-09-28		Ramon Naves
Montcabrer		Meade LX200 12" ACF
Moravian G4-9000 / rpr / 60.0		-8.13 ± 2.3
GPX-1b (LOW)
2023-09-15		Simon Dawes
William James II		Celestron Edge11 HD
Risingcam Monochrome SONY imx571 / Lum / 300.0		0.66 ± 1.73
GPX-1b (LOW)
2023-09-15		Ramon Naves
Montcabrer		Meade LX200 12" ACF
Moravian G4-9000 / rpr / 120.0		-3.66 ± 2.16
GPX-1b (LOW)
2023-09-08		Pierre Farissier
Astroqueyras France		RC500
sbig / Lum / 120.0		-0.09 ± 1.21
GPX-1b (LOW)
2023-09-08		jean paul vergne
CH9-gapra		Ritchey Chretien
zwo 294mm pro / Clear / 180.0		-6.54 ± 3.31
GPX-1b (LOW)
2023-08-12		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Clear / 120.0		5.03 ± 4.32
GPX-1b (LOW)
2023-03-15		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280/1850 (C11 with Starizona reducer)
Moravian Instruments G2-1600 / AstrodonExoPlanet-BB / 120.0		4.48 ± 1.43
GPX-1b (LOW)
2023-02-22		Harri Kiiskinen
Hankasalmi observatory		RCOS Carbon Tube Ritchey-Chrétien Telescope
SBIG STX-16803 / R / 60.0		-6.61 ± 2.88
GPX-1b (LOW)
2023-02-08		Leon Bewersdorff
Observatory Kipshoven (BLEW)		GSO Ritchey-Chrétien
QHY268M-PH / V / 120.0		-3.73 ± 2.88
GPX-1b (LOW)
2023-01-19		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280 /1790 (Celestron C11 with reducer)
Moravian Instruments G2-1600 / AstrodonExoPlanet-BB / 120.0		-3.86 ± 1.87
GPX-1b (LOW)
2022-12-16		christian PANTACCHINI
Observatoire de BENAYES		Skywhatcher Newton
SBIG STF-8300M / Lum / 240.0		4.26 ± 1.87
GPX-1b (LOW)
2022-12-09		Mark Salisbury
POST		Orion Optics ODK
SBIG ST-10 XME / R / 240.0		2.19 ± 1.15
GPX-1b (LOW)
2022-11-25		Mark van der Grijp
Trevinca Observatory		William Optics FLT132
ZWO ASI2600mm Pro / Lum / 47.0		3.98 ± 3.6
GPX-1b (LOW)
2022-11-25		Marc Serrau
A77 Dauban		Celestron 11
QHY268 Mono / Clear / 120.0		-3.36 ± 2.88
GPX-1b (LOW)
2022-11-25		Mark Salisbury
POST		Orion Optics ODK
SBIG ST-10 XME / R / 240.0		-5.15 ± 1.12
GPX-1b (LOW)
2022-11-25		Adam Popowicz
Otivar dome2		Newton 12" ASA
ASI ZWO 1600MM / R / 90.0		-8.26 ± 2.45
GPX-1b (LOW)
2022-11-25		David Quiles
David Quiles Observatory		Celestron EDGEHD 800
Omegon veTEC 571 M / R / 120.0		-17.48 ± 5.76
GPX-1b (LOW)
2022-11-18		Marc Serrau
A77 Dauban		Celestron 11
QHY268 Mono / Clear / 180.0		-10.99 ± 2.74
GPX-1b (LOW)
2022-11-13		Vikrant Kumar Agnihotri
Cepheid Observatory India		GSO Ritchey–Chrétien
SX-35 TRIUS mono (KAF11002) / Lum / 120.0		2.01 ± 2.59
GPX-1b (LOW)
2022-11-05		Simon Dawes
William James II Observatory		Skywatcher MN190 2
ZWO ASI 1600MM-PRO USB 3.0 Mono Camera / Lum / 120.0		0.68 ± 4.46
GPX-1b (LOW)
2022-11-05		Adam Popowicz
Otivar dome2		Newton 12" ASA
ASI ZWO 1600MM / R / 90.0		0.39 ± 3.17
GPX-1b (LOW)
2022-10-30		Claudio Lopresti
Claudio Lopresti		Mak-Newton
CCD Sbig ST10xme / I / 240.0		3.89 ± 4.32
GPX-1b (LOW)
2022-10-30		Ivo Peretto
MarSEC Marana Space Explorer Center		R-C
Moravia G2-1600 MkII / R / 180.0		1.29 ± 3.02
GPX-1b (LOW)
2022-10-30		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 120.0		-7.78 ± 5.47
GPX-1b (LOW)
2022-10-29		Thomas Mollier
Tomastro		Newtonian
ZWO ASI1600MMC / Clear / 60.0		-0.76 ± 3.02
GPX-1b (LOW)
2022-10-29		Alessandro Marchini
Astronomical Observatory University of Siena		Mak-Cas 0.3m f/5.6
Sbig STL-6303 / R / 180.0		-2.2 ± 1.87
GPX-1b (LOW)
2022-10-29		Adam Popowicz
Otivar dome2		Newton 12" ASA
ASI ZWO 1600MM / R / 90.0		-6.09 ± 2.16
GPX-1b (LOW)
2022-10-27		Andre Kovacs
Madrona Peak Observatory		RC Optical 24"
Apogee KAF-16803 CCD / R / 40.0		0.91 ± 1.31
GPX-1b (LOW)
2022-10-16		Nello Ruocco
Osservatorio Astronomico Nastro Verde di Sorrento MPC code C82		SC Meade LX200 GPS on equatorial fork
Sbig ST10XME / R / 180.0		3.75 ± 2.59
GPX-1b (LOW)
2022-10-15		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 120.0		6.02 ± 1.58
GPX-1b (LOW)
2022-10-15		Guillaume GRUNTZ
Alentejo Remote Observatory		Newton 10"
ZWO ASI2600MM / R / 300.0		4.29 ± 4.61
GPX-1b (LOW)
2022-10-15		Martin Crow
Burnham Observatory		Celestron C9.25
SX694 mono / R / 120.0		-0.03 ± 4.9
GPX-1b (LOW)
2022-10-08		Sebastien Brouillard
AstroQueyras		RC500
STX16803 / R / 120.0		4.87 ± 4.75
GPX-1b (LOW)
2022-10-08		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 150.0		0.41 ± 1.87
GPX-1b (LOW)
2022-10-08		Francesco Scaggiante
Gruppo Astrofili Salese "GALILEO GALILEI"		NEWTON 410/1710
Custom made with KAF-1603ME CCD sensor / R / 50.0		-5.79 ± 3.02
GPX-1b (LOW)
2022-09-18		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 180.0		4.48 ± 3.02
GPX-1b (LOW)
2022-09-18		Martin Crow
Burnham Observatory		Celestron C9.25
SX694 mono / R / 120.0		2.18 ± 2.88
GPX-1b (LOW)
2022-09-18		Dim Stouraitis
Galilaios		SCT
SXVF-H9 Starlight-Xpress / R / 90.0		-3.0 ± 4.32
GPX-1b (LOW)
2022-09-11		Stéphane Montchaud
Burgundy Observatory		Celestron 8
Zwo Asi 1600 / Lum / 120.0		3.91 ± 4.32
GPX-1b (LOW)
2022-08-08		Martin Crow
Burnham Observatory		Celestron C9.25
SX694 mono / Clear / 60.0		-0.82 ± 2.02
GPX-1b (LOW)
2022-08-08		Eric Miny
BLOIS SOLOGNE ASTRONOMIE OBSERVATORY		Newton T305
QSI 683WS / Lum / 120.0		-5.14 ± 3.02
GPX-1b (LOW)
2022-07-25		Anaël Wünsche
Observatoire des Baronnies Provençales		Astelco
FLIPL230 / R / 120.0		-1.25 ± 1.01
GPX-1b (LOW)
2022-07-18		Alvaro Fornas
Centro Astronómico Alto Turia (CAAT). MPC J57		Planewave CDK 17"
Sbig STXL 11002 / Lum / 120.0		0.77 ± 2.45
GPX-1b (LOW)
2022-02-19		Sebastien Brouillard
AstroQueyras		RC500
STX16803 / R / 120.0		-4.23 ± 7.2
GPX-1b (LOW)
2022-02-12		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280 /1790 (Celestron C11 with reducer)
Moravian Instruments G2-1600 / Clear / 120.0		1.97 ± 5.76
GPX-1b (LOW)
2022-02-05		Vivien Anzallo
Les Lombards		Newton
ASI294MM pro / Clear / 90.0		6.58 ± 2.16
GPX-1b (LOW)
2022-01-29		Fran Campos
Puig d'Agulles Observtory		RC14" on EQ8 German mount
SBIG ST-8XME / R / 150.0		6.01 ± 1.73
GPX-1b (LOW)
2019-09-21		Alessandro Marchini
Astronomical Observatory University of Siena		Mak-Cas 0.3m f/5.6
Sbig STL-6303 / I / 180.0		-0.24 ± 1.87
GPX-1b (LOW)
2019-09-14		Alessandro Marchini
Astronomical Observatory University of Siena		Mak-Cas 0.3m f/5.6
Sbig STL-6303 / I / 300.0		-0.09 ± 2.45
GPX-1b (LOW)
2018-09-10		Alessandro Marchini
Astronomical Observatory University of Siena		Mak-Cas 0.3m f/5.6
Sbig STL-6303 / R / 300.0		-5.77 ± 2.74
GPX-1b (LOW)
2017-08-17		Alessandro Marchini
Astronomical Observatory University of Siena		Mak-Cas 0.3m f/5.6
Sbig STL-6303 / I / 300.0		5.7 ± 3.17

Space Observations
Planet
Observation Date		 Mission O-C
minutes
GPX-1b (LOW)
2022-11-25		TESS6.86 ± 5.76
GPX-1b (LOW)
2022-11-24		TESS-0.09 ± 3.6
GPX-1b (LOW)
2022-11-22		TESS-3.87 ± 3.31
GPX-1b (LOW)
2022-11-20		TESS-0.88 ± 3.6
GPX-1b (LOW)
2022-11-18		TESS-0.48 ± 6.05
GPX-1b (LOW)
2022-11-17		TESS-7.14 ± 3.17
GPX-1b (LOW)
2022-11-15		TESS-2.42 ± 4.03
GPX-1b (LOW)
2022-11-13		TESS-1.16 ± 8.5
GPX-1b (LOW)
2022-11-11		TESS-9.84 ± 7.49
GPX-1b (LOW)
2022-11-10		TESS3.38 ± 5.62
GPX-1b (LOW)
2022-11-08		TESS1.32 ± 4.18
GPX-1b (LOW)
2022-11-06		TESS7.34 ± 4.61
GPX-1b (LOW)
2022-11-05		TESS11.19 ± 7.49
GPX-1b (LOW)
2022-11-03		TESS10.0 ± 5.18
GPX-1b (LOW)
2022-11-01		TESS-4.14 ± 4.61
GPX-1b (LOW)
2022-10-30		TESS-4.03 ± 7.06

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2019-10-13 Benni et al. 2021 0.07 ± 0.58
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