exoclock

XO-2Nb (LOW)

Discovered by: Burke et al. 2007

The Star
Simbad
GAIA
2MASS		 BD+50 1471
DR2 934346809278715776
J07480647+5013328
RA 07:48:06.4726 DEC +50:13:32.921
Parallax
6.454 mas		 P.M. RA
-29.731 mas/y		 P.M. DEC
-154.272 mas/y
MagV
11.138		 MagR
10.669		 MagI
10.243		 MagJ
9.744		 MagH
9.34		 MagK
9.308
MagG
10.972		 MagGBP
11.416		 MagGRP
10.403
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2458390.674458 ± 9.8e-05 BJDTDB
Period
2.61585974 ± 1.3e-07 days
Transit Parameters
Damasso et al. 2015
Rp/Rs
0.1049 ± 0.0006		 a/Rs
7.93 +0.14 -0.14
 i
88.0 +0.4 -0.3 deg
e
-		 ω
- deg
DepthR*
14.65 mmag		 Duration*
2.71 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Torres et al. 2008
Teff
5340.0 +80.0 -80.0 K
 Log(g)
4.48 +0.05 -0.05 cm/s2
 Fe/H
0.45 +0.05 -0.05 dex
ExoClock Status
Observing Priority LOW
Minimum aperture 5.0"
Total Observations (Recent) 112 (17)
O-C -0.86 ± 0.26 minutes
ExoClock Observations (Recent) 87 (17)
Space Observations (Recent) 23 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 2 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.10483 ± 0.00044

XO-2Nb


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
XO-2Nb (LOW)
2025-11-27		Arturo Martín Saura
OBSERVATORIO SURESTE ESTELAR		SC C8
ASI294mm pro / R / 120.0		-3.31 ± 1.44
XO-2Nb (LOW)
2025-10-03		Tommaso Dittadi
TD-TRO		Ritchey-Chretien
Moravian G2-1600 / R / 180.0		-0.15 ± 1.21
XO-2Nb (LOW)
2025-09-20		Vojtěch Školník
Hvězdárna v Úpici		SW N200/800
MI C2-7000A / Clear / 60.0		-3.23 ± 1.73
XO-2Nb (LOW)
2025-02-14		David Quiles
David Quiles Observatory		Celestron EDGEHD 800
Omegon veTEC 571M / R / 120.0		-0.64 ± 1.3
XO-2Nb (LOW)
2025-02-14		Daniel BOUYSSE
OAA46500		RC TS-Optics f/6.4
ASI2600MC Pro / Lum / 180.0		-1.23 ± 1.02
XO-2Nb (LOW)
2025-02-14		Matthieu Bachschmidt
Gonachon		Celestron C11
SBIG ST8XME / AstrodonExoPlanet-BB / 60.0		-3.0 ± 0.71
XO-2Nb (LOW)
2025-02-01		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280/1850 (C11 with Starizona reducer)
Moravian Instruments G2-1600 / AstrodonExoPlanet-BB / 120.0		-0.4 ± 0.98
XO-2Nb (LOW)
2025-01-24		samuel Diaz Lopez
Tomas Lopez (AstroCamp)		SCA260
Atik16200MM / V / 85.0		1.0 ± 1.87
XO-2Nb (LOW)
2025-01-11		Jordi Gallego
Fosca Nit Observatory		Takahashi TOA-150
STL-11000 M / rpr / 120.0		6.47 ± 4.18
XO-2Nb (LOW)
2025-01-11		Francesco Scaggiante
Gruppo Astrofili Salese "GALILEO GALILEI"		NEWTON 410/1710
Player One Astronomy Poseidon-M Pro (IMX571) / rpr / 30.0		2.29 ± 1.87
XO-2Nb (LOW)
2025-01-11		Ulisse Quadri
Bassano Bresciano Obs.		Telescopio 440 mm
Vision 221M / R / 30.0		-2.59 ± 1.31
XO-2Nb (LOW)
2025-01-06		Lee YuHsien
KMSH Observatory		C14HD
QSI-660 / R / 50.0		-6.03 ± 5.9
XO-2Nb (LOW)
2025-01-04		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 60.0		-0.26 ± 0.68
XO-2Nb (LOW)
2025-01-04		Simon Dawes
William James II		Celestron Edge11 HD
Risingcam Monochrome SONY imx571 / Lum / 99.0		-1.11 ± 1.41
XO-2Nb (LOW)
2024-12-16		Lee YuHsien
KMSH Observatory		C14HD
QSI-660 / R / 60.0		-2.03 ± 2.02
XO-2Nb (LOW)
2024-12-14		samuel Diaz Lopez
Tomas Lopez (AstroCamp)		SCA260
Atik16200MM / V / 143.0		2.06 ± 1.38
XO-2Nb (LOW)
2024-12-14		Ramon Naves
Montcabrer		Meade LX200 12" ACF
Moravian G4-9000 / ipr / 120.0		-0.15 ± 1.02
XO-2Nb (LOW)
2024-11-10		Elena Carloni
OARPAF		Astelco T-800
STX-16801SBIG / R / 360.0		-4.29 ± 3.17
XO-2Nb (LOW)
2024-04-12		Bryan Martin
Tiger Butte Observatory Remote		AG Optical IDK
ZWO ASI 294 / R / 30.0		-1.21 ± 1.58
XO-2Nb (LOW)
2024-03-24		Simon Dawes
William James II		Celestron Edge11 HD
Risingcam Monochrome SONY imx571 / Lum / 105.0		-0.46 ± 2.02
XO-2Nb (LOW)
2024-03-24		Olivier Rethore
Observatoire de La Nau Pied 0		Celestron 8 Edge
Player One Poseidon M-Pro / Clear / 120.0		-1.02 ± 1.05
XO-2Nb (LOW)
2024-03-03		Jose Carballada
Carballada Ager AAS		CFF 250
QHY268M / Lum / 90.0		-0.2 ± 2.02
XO-2Nb (LOW)
2024-02-19		Fabio Mortari
Hypatia Observatory		Ritchey Chretienne 250mm f/5.3
MORAVIAN C2-7000A / R / 100.0		1.35 ± 1.27
XO-2Nb (LOW)
2024-02-14		Yen-Hsing Lin
NTHU TAT		GSO RC10
Apogee AltaF-6: KAF1001E / B / 60.0		-1.62 ± 3.17
XO-2Nb (LOW)
2024-01-29		Attilio Bruzzone
Anxanum Observatory		LX200 ACF 10"
QHY 268M / R / 120.0		0.18 ± 1.18
XO-2Nb (LOW)
2023-11-22		Robert Roth
TURMX Observatory		Planewave CDK17
Moravian C1x 61000 Pro / rpr / 120.0		-0.59 ± 1.44
XO-2Nb (LOW)
2023-11-22		Patrick Farizy
Patrick Farizy		Celestron C8
I nova nbb cx / Clear / 72.218		-2.9 ± 1.87
XO-2Nb (LOW)
2023-05-02		Eric Miny
BLOIS SOLOGNE ASTRONOMIE OBSERVATORY		Newton T305
QSI 683WS / Lum / 60.0		1.65 ± 1.58
XO-2Nb (LOW)
2023-04-17		Bryan Martin
Tiger Butte Observatory Remote		AG Optical IDK
ZWO ASI 294 / Lum / 30.0		0.73 ± 2.16
XO-2Nb (LOW)
2023-03-29		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 60.0		0.66 ± 1.44
XO-2Nb (LOW)
2023-03-16		Dominique DANIEL
La Montjoie		T250 Skyvision
Camera CMOS ZWO ASI2600MC pro (color) / Clear / 120.0		-1.41 ± 2.3
XO-2Nb (LOW)
2023-02-10		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / R / 120.0		1.34 ± 0.79
XO-2Nb (LOW)
2023-02-10		Marc Serrau
A77 Dauban		Celestron 11
QHY268 Mono / rpr / 60.0		0.29 ± 1.58
XO-2Nb (LOW)
2023-02-10		Fabio Mortari
Hypatia Observatory		Ritchey Chretienne 250mm f/5.3
MORAVIAN C2-7000A / R / 100.0		-0.76 ± 0.85
XO-2Nb (LOW)
2023-01-20		Thomas Wocial
Coppetts Observatory		Celestron C8
QHY183M / AstrodonExoPlanet-BB / 60.0		0.73 ± 1.04
XO-2Nb (LOW)
2022-12-25		Vikrant Kumar Agnihotri
Cepheid Observatory India		GSO Ritchey–Chrétien
SX-35 TRIUS mono (KAF11002) / Lum / 120.0		-1.62 ± 2.3
XO-2Nb (LOW)
2022-12-17		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave 2
ZWO ASI6200 / R / 120.0		1.13 ± 0.56
XO-2Nb (LOW)
2022-12-17		Jacques Michelet
Claix		GSO Ritchey-Chrétien
QSI-632 / R / 120.0		-0.68 ± 1.05
XO-2Nb (LOW)
2022-12-10		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 60.0		0.4 ± 0.69
XO-2Nb (LOW)
2022-12-10		Simon Dawes
William James II Observatory		Skywatcher MN190 2
ZWO ASI 1600MM-PRO USB 3.0 Mono Camera / R / 180.0		-7.01 ± 3.31
XO-2Nb (LOW)
2022-11-26		Salvador Miquel Romero
Vedat Observatory		Meade SN10 F/4.1
SBIG ST8XME / Clear / 120.0		-0.56 ± 1.27
XO-2Nb (LOW)
2022-11-26		Jean-Claude MARIO
Observatoire de la Cabergue		T 500 Cassegrain "Arp 83"
ASI 6200 MM / Lum / 180.0		-2.4 ± 3.02
XO-2Nb (LOW)
2022-11-06		David Quiles
David Quiles Observatory		Celestron EDGEHD 800
Omegon veTEC 571 M / R / 120.0		2.15 ± 1.01
XO-2Nb (LOW)
2022-11-06		Marco Stefanini
Osservatorio Aldebaran		Ritchey-Chretien Altair Astro
Atik 4000 LE / Lum / 250.0		0.59 ± 2.88
XO-2Nb (LOW)
2022-11-06		Francesco Scaggiante
Gruppo Astrofili Salese "GALILEO GALILEI"		NEWTON 410/1710
Custom made with KAF-1603ME CCD sensor / R / 25.0		-2.5 ± 1.24
XO-2Nb (LOW)
2022-04-05		Yungshun Chen
FYSHOBS		Takahashi Mewlon 300
SBIG ST-8300M / Lum / 60.0		-4.59 ± 1.15
XO-2Nb (LOW)
2022-03-20		Harri Kiiskinen
Harri Kiiskinen		Takahashi FSQ-85ED
QHY163M / R / 60.0		5.14 ± 4.32
XO-2Nb (LOW)
2022-03-20		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280 /1790 (Celestron C11 with reducer)
Moravian Instruments G2-1600 / Clear / 120.0		-0.19 ± 0.72
XO-2Nb (LOW)
2022-03-13		Stefano Lora
MarSEC		Ritchey Chrétien
Moravian G2 Mark II / Clear / 60.0		3.81 ± 2.74
XO-2Nb (LOW)
2022-02-07		Fran Campos
Puig d'Agulles Observtory		RC14" on EQ8 German mount
SBIG ST-8XME / R / 90.0		-0.83 ± 0.86
XO-2Nb (LOW)
2022-01-17		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 120.0		3.46 ± 1.73
XO-2Nb (LOW)
2022-01-11		christian PANTACCHINI
Observatoire de Benayes		Skywhatcher Newton
QHY8L / Clear / 60.0		1.33 ± 2.59
XO-2Nb (LOW)
2022-01-11		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 60.0		-0.4 ± 1.58
XO-2Nb (LOW)
2022-01-11		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave 2
ZWO ASI6200 / Clear / 120.0		-1.27 ± 1.3
XO-2Nb (LOW)
2021-12-14		Enrique Arce
Vallbona Observatory		Newton 10" f4
Sbig ST7-XME / V / 60.0		-3.49 ± 3.17
XO-2Nb (LOW)
2021-11-10		Jean-Baptiste Marquette
MrKite47		Newton Sky-Watcher 200/1000
ZWO ASI183MM Pro / R / 129.0		-2.8 ± 2.02
XO-2Nb (LOW)
2021-03-24		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280 /1790 (Celestron C11 with reducer)
Moravian Instruments G2-1600 / Clear / 120.0		1.31 ± 0.58
XO-2Nb (LOW)
2021-03-24		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave 2
ZWO ASI6200 / Clear / 120.0		1.03 ± 1.15
XO-2Nb (LOW)
2021-03-24		Jean-Bernard Pioppa
La Roque-Esclapon		KEPLER
ATIK 383 L+ / R / 60.0		-0.13 ± 1.3
XO-2Nb (LOW)
2021-03-24		Matteo Cataneo
Osservatorio Astronomico Civico "G. Barletta"		Marcon Ritchey–Chrétien
Starlight Xpress SXVR-H18 / rpr / 180.0		-0.27 ± 1.44
XO-2Nb (LOW)
2021-03-24		Francesco Scaggiante
Gruppo Astrofili Salese "GALILEO GALILEI"		NEWTON 410/1710
Custom made with KAF-1603ME CCD sensor / R / 20.0		-1.57 ± 0.86
XO-2Nb (LOW)
2021-02-18		Geoffrey Thurston
I67		Celestron C-14
Atik 314L+ / R / 20.0		-0.02 ± 2.16
XO-2Nb (LOW)
2021-02-18		Pete Mills
Walcott Observatory		Meade SCT
ZWO ASI178MM / Clear / 30.0		-1.89 ± 0.86
XO-2Nb (LOW)
2021-02-18		Martin Crow
Burnham Observatory		Celestron C9.25
SX694 mono / R / 75.0		-3.18 ± 1.3
XO-2Nb (LOW)
2020-11-08		Tõnis Eenmäe
Tartu Observatory		Planewave CDK 12.5
Apogee Alta U42 / R / 30.0		-0.98 ± 1.3
XO-2Nb (LOW)
2020-11-01		Dim Stouraitis
Galilaios		SCT
SXVF-H9 Starlight-Xpress / R / 20.0		-2.45 ± 1.44
XO-2Nb (LOW)
2020-04-10		Pere Guerra
Observatori Astronòmic Albanyà		16" Meade ACF F8
Moravian G4-9000 / I / 120.0		0.52 ± 1.15
XO-2Nb (LOW)
2020-04-10		John Savage
Z42 Rushay Farm Observatory		Celeston 14Edge with focal reducer
ATIK One 9.0 / V / 60.0		-0.35 ± 0.86
XO-2Nb (LOW)
2020-04-10		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280 /1790 (Celestron C11 with reducer)
Moravian Instruments G2-1600 / R / 120.0		-0.92 ± 0.72
XO-2Nb (LOW)
2020-04-10		Martin Crow
Burnham Observatory		Celestron C9.25
SX694 mono / R / 90.0		-1.64 ± 1.01
XO-2Nb (LOW)
2020-03-28		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave
SBIG STL11K / Clear / 120.0		1.09 ± 0.72
XO-2Nb (LOW)
2020-03-28		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280 /1790 (Celestron C11 with reducer)
Moravian Instruments G2-1600 / Clear / 120.0		1.09 ± 0.58
XO-2Nb (LOW)
2020-02-16		Mauro Caló
Cavallino		RC
SBIG ST10 / R / 90.0		0.88 ± 1.58
XO-2Nb (LOW)
2020-01-20		Martin Crow
Burnham Observatory		Celestron C9.25
SX694 mono / R / 90.0		-0.27 ± 1.15
XO-2Nb (LOW)
2020-01-13		Mauro Caló
Cavallino		RC
SBIG ST10 / R / 90.0		1.42 ± 1.3
XO-2Nb (LOW)
2019-02-20		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave
SBIG STL11K / R / 120.0		1.81 ± 1.3
XO-2Nb (LOW)
2019-01-11		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave
SBIG STL11K / Clear / 120.0		-1.22 ± 4.32
XO-2Nb (LOW)
2018-04-06		Anaël Wünsche
Observatoire des Baronnies Provençales		Astelco
FLIPL230 / Lum / 60.0		-0.51 ± 0.58
XO-2Nb (LOW)
2017-03-07		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave
SBIG STL11K / Clear / 60.0		-1.63 ± 1.01
XO-2Nb (LOW)
2017-02-22		Nikolaos Paschalis
Nunki Observatory		Officina Stellare RILA 400
SBIG STXL 11002 / R / 60.0		4.27 ± 1.3
XO-2Nb (LOW)
2016-04-14		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave
SBIG STL11K / Clear / 60.0		-0.53 ± 0.86
XO-2Nb (LOW)
2016-03-11		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave
SBIG STL11K / R / 60.0		-1.28 ± 0.72
XO-2Nb (LOW)
2013-12-22		Ramon Naves
Montcabrer		Meade LX200 12" ACF
Sbig ST8xme / Clear / 120.0		1.08 ± 1.4
XO-2Nb (LOW)
2011-02-07		Filip Walter
Stefanik Observatory		Meade SCT
SBIG ST-10XME / R / 90.0		1.71 ± 0.72
XO-2Nb (LOW)
2011-01-24		Ramon Naves
Montcabrer		Meade LX200 12" ACF
Sbig ST8xme / R / 120.0		2.27 ± 0.89
XO-2Nb (LOW)
2010-01-15		Alessandro Marchini
Astronomical Observatory University of Siena		Mak-Cas 0.3m f/5.6
Sbig STL-6303 / R / 60.0		2.2 ± 1.01
XO-2Nb (LOW)
2008-01-24		Alessandro Marchini
Astronomical Observatory University of Siena		Mak-Cas 0.3m f/5.6
Sbig STL-6303 / V / 90.0		-0.7 ± 1.58

Space Observations
Planet
Observation Date		 Mission O-C
minutes
XO-2Nb (LOW)
2023-01-15		TESS-0.82 ± 1.15
XO-2Nb (LOW)
2023-01-13		TESS0.24 ± 1.14
XO-2Nb (LOW)
2023-01-02		TESS-0.65 ± 1.4
XO-2Nb (LOW)
2022-12-30		TESS2.4 ± 1.37
XO-2Nb (LOW)
2022-12-28		TESS-1.42 ± 1.58
XO-2Nb (LOW)
2022-12-25		TESS2.28 ± 1.22
XO-2Nb (LOW)
2022-01-24		TESS-1.85 ± 0.79
XO-2Nb (LOW)
2022-01-22		TESS0.03 ± 0.81
XO-2Nb (LOW)
2022-01-19		TESS-0.28 ± 0.84
XO-2Nb (LOW)
2022-01-17		TESS-3.86 ± 1.05
XO-2Nb (LOW)
2022-01-11		TESS0.15 ± 0.76
XO-2Nb (LOW)
2022-01-09		TESS-0.89 ± 0.91
XO-2Nb (LOW)
2022-01-06		TESS-0.81 ± 1.12
XO-2Nb (LOW)
2022-01-04		TESS0.68 ± 0.79
XO-2Nb (LOW)
2022-01-01		TESS-0.69 ± 0.89
XO-2Nb (LOW)
2020-01-18		TESS0.58 ± 0.84
XO-2Nb (LOW)
2020-01-15		TESS0.45 ± 0.95
XO-2Nb (LOW)
2020-01-13		TESS0.49 ± 1.09
XO-2Nb (LOW)
2020-01-10		TESS-0.06 ± 1.01
XO-2Nb (LOW)
2020-01-05		TESS-0.02 ± 1.11
XO-2Nb (LOW)
2020-01-02		TESS1.11 ± 1.04
XO-2Nb (LOW)
2019-12-30		TESS1.98 ± 1.09
XO-2Nb (LOW)
2019-12-25		TESS-0.71 ± 1.01

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2017-02-17 Wang et al. 2021 -2.9 ± 1.44
2007-02-16 Burke et al. 2007 -0.23 ± 0.29
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