XO-2Nb - ExoClock

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XO-2Nb (LOW)

Discovered by: Burke et al. 2007

Priorities

EPHEMERIS PRIORITY The target uncertainty has been defined as the 1/12 of the target's transit duration (in 2029).

ALERT: Observations in the last 2 years show an O-C greater than 10 minutes.
HIGH: Prediction uncertainty greater than the target or less than 3 epochs observed in the last 2 years.
MEDIUM: Less than 3 epochs observed in the last year.
LOW: Else.

SPECIAL SCIENCE CASES

TTVs: Planet exhibiting strong Transit Timing Variations due to another planet or orbital decay/precession.
SPOTS: Planet with frequent spot-crossing events.
YOUNG: Planet in a young planetary system.

The Star
SimbadGAIA2MASS	BD+50 1471DR2 934346809278715776J07480647+5013328
RA	07:48:06.4726		DEC	+50:13:32.921
Parallax6.454 mas		P.M. RA-29.731 mas/y		P.M. DEC-154.272 mas/y
MagV11.138	MagR10.669	MagI10.243	MagJ9.744	MagH9.34	MagK9.308
MagG10.972		MagGBP11.416		MagGRP10.403
*Calculated from GAIA magnitudes.

Ephemeris - Verified
Kokori et al. 2025
Mid-time2458390.674458 ± 9.8e-05 BJDTDB
Period2.61585974 ± 1.3e-07 days
Transit Parameters
Damasso et al. 2015
Rp/Rs0.1049 ± 0.0006	a/Rs 7.93 +0.14 -0.14		i 88.0 +0.4 -0.3 deg
Rp/Rs0.1049 ± 0.0006	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

PlanetObservation Date	ObserverObservatory	Telescope Camera / Filter / Exp [s]	O-Cminutes
ExoClock Observations
XO-2Nb (LOW)2025-11-27	Arturo Martín SauraOBSERVATORIO SURESTE ESTELAR	SC C8ASI294mm pro / R / 120.0	-3.31 ± 1.44	View
XO-2Nb (LOW)2025-10-03	Tommaso DittadiTD-TRO	Ritchey-ChretienMoravian G2-1600 / R / 180.0	-0.15 ± 1.21	View
XO-2Nb (LOW)2025-09-20	Vojtěch ŠkolníkHvězdárna v Úpici	SW N200/800MI C2-7000A / Clear / 60.0	-3.23 ± 1.73	View
XO-2Nb (LOW)2025-02-14	David QuilesDavid Quiles Observatory	Celestron EDGEHD 800Omegon veTEC 571M / R / 120.0	-0.64 ± 1.3	View
XO-2Nb (LOW)2025-02-14	Daniel BOUYSSEOAA46500	RC TS-Optics f/6.4ASI2600MC Pro / Lum / 180.0	-1.23 ± 1.02	View
XO-2Nb (LOW)2025-02-14	Matthieu BachschmidtGonachon	Celestron C11SBIG ST8XME / AstrodonExoPlanet-BB / 60.0	-3.0 ± 0.71	View
XO-2Nb (LOW)2025-02-01	Manfred Raetzprivat observatory Herges-Hallenberg	SCT 280/1850 (C11 with Starizona reducer)Moravian Instruments G2-1600 / AstrodonExoPlanet-BB / 120.0	-0.4 ± 0.98	View
XO-2Nb (LOW)2025-01-24	samuel Diaz LopezTomas Lopez (AstroCamp)	SCA260Atik16200MM / V / 85.0	1.0 ± 1.87	View
XO-2Nb (LOW)2025-01-11	Jordi GallegoFosca Nit Observatory	Takahashi TOA-150STL-11000 M / rpr / 120.0	6.47 ± 4.18	View
XO-2Nb (LOW)2025-01-11	Francesco ScaggianteGruppo Astrofili Salese "GALILEO GALILEI"	NEWTON 410/1710Player One Astronomy Poseidon-M Pro (IMX571) / rpr / 30.0	2.29 ± 1.87	View
XO-2Nb (LOW)2025-01-11	Ulisse QuadriBassano Bresciano Obs.	Telescopio 440 mmVision 221M / R / 30.0	-2.59 ± 1.31	View
XO-2Nb (LOW)2025-01-06	Lee YuHsienKMSH Observatory	C14HDQSI-660 / R / 50.0	-6.03 ± 5.9	View
XO-2Nb (LOW)2025-01-04	Yves JongenRasteau Observatory	Plane Wave CDK 17"SBIG STXL 11002 / Lum / 60.0	-0.26 ± 0.68	View
XO-2Nb (LOW)2025-01-04	Simon DawesWilliam James II	Celestron Edge11 HDRisingcam Monochrome SONY imx571 / Lum / 99.0	-1.11 ± 1.41	View
XO-2Nb (LOW)2024-12-16	Lee YuHsienKMSH Observatory	C14HDQSI-660 / R / 60.0	-2.03 ± 2.02	View
XO-2Nb (LOW)2024-12-14	samuel Diaz LopezTomas Lopez (AstroCamp)	SCA260Atik16200MM / V / 143.0	2.06 ± 1.38	View
XO-2Nb (LOW)2024-12-14	Ramon NavesMontcabrer	Meade LX200 12" ACFMoravian G4-9000 / ipr / 120.0	-0.15 ± 1.02	View
XO-2Nb (LOW)2024-11-10	Elena CarloniOARPAF	Astelco T-800STX-16801SBIG / R / 360.0	-4.29 ± 3.17	View
XO-2Nb (LOW)2024-04-12	Bryan MartinTiger Butte Observatory Remote	AG Optical IDKZWO ASI 294 / R / 30.0	-1.21 ± 1.58	View
XO-2Nb (LOW)2024-03-24	Simon DawesWilliam James II	Celestron Edge11 HDRisingcam Monochrome SONY imx571 / Lum / 105.0	-0.46 ± 2.02	View
XO-2Nb (LOW)2024-03-24	Olivier RethoreObservatoire de La Nau Pied 0	Celestron 8 EdgePlayer One Poseidon M-Pro / Clear / 120.0	-1.02 ± 1.05	View
XO-2Nb (LOW)2024-03-03	Jose CarballadaCarballada Ager AAS	CFF 250QHY268M / Lum / 90.0	-0.2 ± 2.02	View
XO-2Nb (LOW)2024-02-19	Fabio MortariHypatia Observatory	Ritchey Chretienne 250mm f/5.3MORAVIAN C2-7000A / R / 100.0	1.35 ± 1.27	View
XO-2Nb (LOW)2024-02-14	Yen-Hsing LinNTHU TAT	GSO RC10Apogee AltaF-6: KAF1001E / B / 60.0	-1.62 ± 3.17	View
XO-2Nb (LOW)2024-01-29	Attilio BruzzoneAnxanum Observatory	LX200 ACF 10"QHY 268M / R / 120.0	0.18 ± 1.18	View
XO-2Nb (LOW)2023-11-22	Robert RothTURMX Observatory	Planewave CDK17Moravian C1x 61000 Pro / rpr / 120.0	-0.59 ± 1.44	View & Get data
XO-2Nb (LOW)2023-11-22	Patrick FarizyPatrick Farizy	Celestron C8I nova nbb cx / Clear / 72.218	-2.9 ± 1.87	View
XO-2Nb (LOW)2023-05-02	Eric MinyBLOIS SOLOGNE ASTRONOMIE OBSERVATORY	Newton T305QSI 683WS / Lum / 60.0	1.65 ± 1.58	View & Get data
XO-2Nb (LOW)2023-04-17	Bryan MartinTiger Butte Observatory Remote	AG Optical IDKZWO ASI 294 / Lum / 30.0	0.73 ± 2.16	View & Get data
XO-2Nb (LOW)2023-03-29	Paolo Arcangelo MatassaP:M.P.H.R. Deep Sky (K81)	Ritchey Chretien 40cm-F5.3CCD ICX453AQ / Lum / 60.0	0.66 ± 1.44	View & Get data
XO-2Nb (LOW)2023-03-16	Dominique DANIELLa Montjoie	T250 SkyvisionCamera CMOS ZWO ASI2600MC pro (color) / Clear / 120.0	-1.41 ± 2.3	View & Get data
XO-2Nb (LOW)2023-02-10	Yves JongenRasteau Observatory	Plane Wave CDK 17"SBIG STXL 11002 / R / 120.0	1.34 ± 0.79	View & Get data
XO-2Nb (LOW)2023-02-10	Marc SerrauA77 Dauban	Celestron 11QHY268 Mono / rpr / 60.0	0.29 ± 1.58	View & Get data
XO-2Nb (LOW)2023-02-10	Fabio MortariHypatia Observatory	Ritchey Chretienne 250mm f/5.3MORAVIAN C2-7000A / R / 100.0	-0.76 ± 0.85	View & Get data
XO-2Nb (LOW)2023-01-20	Thomas WocialCoppetts Observatory	Celestron C8QHY183M / AstrodonExoPlanet-BB / 60.0	0.73 ± 1.04	View
XO-2Nb (LOW)2022-12-25	Vikrant Kumar AgnihotriCepheid Observatory India	GSO Ritchey–ChrétienSX-35 TRIUS mono (KAF11002) / Lum / 120.0	-1.62 ± 2.3	View & Get data
XO-2Nb (LOW)2022-12-17	Anaël WünscheObservatoire des Baronnies Provençales	CDK Planewave 2ZWO ASI6200 / R / 120.0	1.13 ± 0.56	View & Get data
XO-2Nb (LOW)2022-12-17	Jacques MicheletClaix	GSO Ritchey-ChrétienQSI-632 / R / 120.0	-0.68 ± 1.05	View & Get data
XO-2Nb (LOW)2022-12-10	Adrian JonesPrivate Observatory (I64)	Meade ACF 30cmQSI 583 / R / 60.0	0.4 ± 0.69	View & Get data
XO-2Nb (LOW)2022-12-10	Simon DawesWilliam James II Observatory	Skywatcher MN190 2ZWO ASI 1600MM-PRO USB 3.0 Mono Camera / R / 180.0	-7.01 ± 3.31	View & Get data
XO-2Nb (LOW)2022-11-26	Salvador Miquel RomeroVedat Observatory	Meade SN10 F/4.1SBIG ST8XME / Clear / 120.0	-0.56 ± 1.27	View & Get data
XO-2Nb (LOW)2022-11-26	Jean-Claude MARIOObservatoire de la Cabergue	T 500 Cassegrain "Arp 83"ASI 6200 MM / Lum / 180.0	-2.4 ± 3.02	View & Get data
XO-2Nb (LOW)2022-11-06	David QuilesDavid Quiles Observatory	Celestron EDGEHD 800Omegon veTEC 571 M / R / 120.0	2.15 ± 1.01	View & Get data
XO-2Nb (LOW)2022-11-06	Marco StefaniniOsservatorio Aldebaran	Ritchey-Chretien Altair AstroAtik 4000 LE / Lum / 250.0	0.59 ± 2.88	View & Get data
XO-2Nb (LOW)2022-11-06	Francesco ScaggianteGruppo Astrofili Salese "GALILEO GALILEI"	NEWTON 410/1710Custom made with KAF-1603ME CCD sensor / R / 25.0	-2.5 ± 1.24	View & Get data
XO-2Nb (LOW)2022-04-05	Yungshun ChenFYSHOBS	Takahashi Mewlon 300SBIG ST-8300M / Lum / 60.0	-4.59 ± 1.15	View
XO-2Nb (LOW)2022-03-20	Harri KiiskinenHarri Kiiskinen	Takahashi FSQ-85EDQHY163M / R / 60.0	5.14 ± 4.32	View & Get data
XO-2Nb (LOW)2022-03-20	Manfred Raetzprivat observatory Herges-Hallenberg	SCT 280 /1790 (Celestron C11 with reducer)Moravian Instruments G2-1600 / Clear / 120.0	-0.19 ± 0.72	View & Get data
XO-2Nb (LOW)2022-03-13	Stefano LoraMarSEC	Ritchey ChrétienMoravian G2 Mark II / Clear / 60.0	3.81 ± 2.74	View & Get data
XO-2Nb (LOW)2022-02-07	Fran CamposPuig d'Agulles Observtory	RC14" on EQ8 German mountSBIG ST-8XME / R / 90.0	-0.83 ± 0.86	View & Get data
XO-2Nb (LOW)2022-01-17	Paolo Arcangelo MatassaP:M.P.H.R. Deep Sky (K81)	Ritchey Chretien 40cm-F5.3CCD ICX453AQ / Lum / 120.0	3.46 ± 1.73	View & Get data
XO-2Nb (LOW)2022-01-11	christian PANTACCHINIObservatoire de Benayes	Skywhatcher NewtonQHY8L / Clear / 60.0	1.33 ± 2.59	View & Get data
XO-2Nb (LOW)2022-01-11	Paolo Arcangelo MatassaP:M.P.H.R. Deep Sky (K81)	Ritchey Chretien 40cm-F5.3CCD ICX453AQ / Lum / 60.0	-0.4 ± 1.58	View & Get data
XO-2Nb (LOW)2022-01-11	Anaël WünscheObservatoire des Baronnies Provençales	CDK Planewave 2ZWO ASI6200 / Clear / 120.0	-1.27 ± 1.3	View & Get data
XO-2Nb (LOW)2021-12-14	Enrique ArceVallbona Observatory	Newton 10" f4Sbig ST7-XME / V / 60.0	-3.49 ± 3.17	View & Get data
XO-2Nb (LOW)2021-11-10	Jean-Baptiste MarquetteMrKite47	Newton Sky-Watcher 200/1000ZWO ASI183MM Pro / R / 129.0	-2.8 ± 2.02	View & Get data
XO-2Nb (LOW)2021-03-24	Manfred Raetzprivat observatory Herges-Hallenberg	SCT 280 /1790 (Celestron C11 with reducer)Moravian Instruments G2-1600 / Clear / 120.0	1.31 ± 0.58	View & Get data
XO-2Nb (LOW)2021-03-24	Anaël WünscheObservatoire des Baronnies Provençales	CDK Planewave 2ZWO ASI6200 / Clear / 120.0	1.03 ± 1.15	View & Get data
XO-2Nb (LOW)2021-03-24	Jean-Bernard PioppaLa Roque-Esclapon	KEPLERATIK 383 L+ / R / 60.0	-0.13 ± 1.3	View & Get data
XO-2Nb (LOW)2021-03-24	Matteo CataneoOsservatorio Astronomico Civico "G. Barletta"	Marcon Ritchey–ChrétienStarlight Xpress SXVR-H18 / rpr / 180.0	-0.27 ± 1.44	View & Get data
XO-2Nb (LOW)2021-03-24	Francesco ScaggianteGruppo Astrofili Salese "GALILEO GALILEI"	NEWTON 410/1710Custom made with KAF-1603ME CCD sensor / R / 20.0	-1.57 ± 0.86	View & Get data
XO-2Nb (LOW)2021-02-18	Geoffrey ThurstonI67	Celestron C-14Atik 314L+ / R / 20.0	-0.02 ± 2.16	View & Get data
XO-2Nb (LOW)2021-02-18	Pete MillsWalcott Observatory	Meade SCTZWO ASI178MM / Clear / 30.0	-1.89 ± 0.86	View
XO-2Nb (LOW)2021-02-18	Martin CrowBurnham Observatory	Celestron C9.25SX694 mono / R / 75.0	-3.18 ± 1.3	View & Get data
XO-2Nb (LOW)2020-11-08	Tõnis EenmäeTartu Observatory	Planewave CDK 12.5Apogee Alta U42 / R / 30.0	-0.98 ± 1.3	View & Get data
XO-2Nb (LOW)2020-11-01	Dim StouraitisGalilaios	SCTSXVF-H9 Starlight-Xpress / R / 20.0	-2.45 ± 1.44	View & Get data
XO-2Nb (LOW)2020-04-10	Pere GuerraObservatori Astronòmic Albanyà	16" Meade ACF F8Moravian G4-9000 / I / 120.0	0.52 ± 1.15	View & Get data
XO-2Nb (LOW)2020-04-10	John SavageZ42 Rushay Farm Observatory	Celeston 14Edge with focal reducerATIK One 9.0 / V / 60.0	-0.35 ± 0.86	View & Get data
XO-2Nb (LOW)2020-04-10	Manfred Raetzprivat observatory Herges-Hallenberg	SCT 280 /1790 (Celestron C11 with reducer)Moravian Instruments G2-1600 / R / 120.0	-0.92 ± 0.72	View & Get data
XO-2Nb (LOW)2020-04-10	Martin CrowBurnham Observatory	Celestron C9.25SX694 mono / R / 90.0	-1.64 ± 1.01	View & Get data
XO-2Nb (LOW)2020-03-28	Anaël WünscheObservatoire des Baronnies Provençales	CDK PlanewaveSBIG STL11K / Clear / 120.0	1.09 ± 0.72	View & Get data
XO-2Nb (LOW)2020-03-28	Manfred Raetzprivat observatory Herges-Hallenberg	SCT 280 /1790 (Celestron C11 with reducer)Moravian Instruments G2-1600 / Clear / 120.0	1.09 ± 0.58	View & Get data
XO-2Nb (LOW)2020-02-16	Mauro CalóCavallino	RCSBIG ST10 / R / 90.0	0.88 ± 1.58	View & Get data
XO-2Nb (LOW)2020-01-20	Martin CrowBurnham Observatory	Celestron C9.25SX694 mono / R / 90.0	-0.27 ± 1.15	View & Get data
XO-2Nb (LOW)2020-01-13	Mauro CalóCavallino	RCSBIG ST10 / R / 90.0	1.42 ± 1.3	View & Get data
XO-2Nb (LOW)2019-02-20	Anaël WünscheObservatoire des Baronnies Provençales	CDK PlanewaveSBIG STL11K / R / 120.0	1.81 ± 1.3	View & Get data
XO-2Nb (LOW)2019-01-11	Anaël WünscheObservatoire des Baronnies Provençales	CDK PlanewaveSBIG STL11K / Clear / 120.0	-1.22 ± 4.32	View & Get data
XO-2Nb (LOW)2018-04-06	Anaël WünscheObservatoire des Baronnies Provençales	AstelcoFLIPL230 / Lum / 60.0	-0.51 ± 0.58	View & Get data
XO-2Nb (LOW)2017-03-07	Anaël WünscheObservatoire des Baronnies Provençales	CDK PlanewaveSBIG STL11K / Clear / 60.0	-1.63 ± 1.01	View & Get data
XO-2Nb (LOW)2017-02-22	Nikolaos PaschalisNunki Observatory	Officina Stellare RILA 400SBIG STXL 11002 / R / 60.0	4.27 ± 1.3	View & Get data
XO-2Nb (LOW)2016-04-14	Anaël WünscheObservatoire des Baronnies Provençales	CDK PlanewaveSBIG STL11K / Clear / 60.0	-0.53 ± 0.86	View & Get data
XO-2Nb (LOW)2016-03-11	Anaël WünscheObservatoire des Baronnies Provençales	CDK PlanewaveSBIG STL11K / R / 60.0	-1.28 ± 0.72	View & Get data
XO-2Nb (LOW)2013-12-22	Ramon NavesMontcabrer	Meade LX200 12" ACFSbig ST8xme / Clear / 120.0	1.08 ± 1.4	View
XO-2Nb (LOW)2011-02-07	Filip WalterStefanik Observatory	Meade SCTSBIG ST-10XME / R / 90.0	1.71 ± 0.72	View & Get data
XO-2Nb (LOW)2011-01-24	Ramon NavesMontcabrer	Meade LX200 12" ACFSbig ST8xme / R / 120.0	2.27 ± 0.89	View
XO-2Nb (LOW)2010-01-15	Alessandro MarchiniAstronomical Observatory University of Siena	Mak-Cas 0.3m f/5.6Sbig STL-6303 / R / 60.0	2.2 ± 1.01	View & Get data
XO-2Nb (LOW)2008-01-24	Alessandro MarchiniAstronomical Observatory University of Siena	Mak-Cas 0.3m f/5.6Sbig STL-6303 / V / 90.0	-0.7 ± 1.58	View & Get data
Space Observations
PlanetObservation Date	Mission		O-Cminutes
XO-2Nb (LOW)2023-01-15	TESS		-0.82 ± 1.15	View & Get data
XO-2Nb (LOW)2023-01-13	TESS		0.24 ± 1.14	View & Get data
XO-2Nb (LOW)2023-01-02	TESS		-0.65 ± 1.4	View & Get data
XO-2Nb (LOW)2022-12-30	TESS		2.4 ± 1.37	View & Get data
XO-2Nb (LOW)2022-12-28	TESS		-1.42 ± 1.58	View & Get data
XO-2Nb (LOW)2022-12-25	TESS		2.28 ± 1.22	View & Get data
XO-2Nb (LOW)2022-01-24	TESS		-1.85 ± 0.79	View & Get data
XO-2Nb (LOW)2022-01-22	TESS		0.03 ± 0.81	View & Get data
XO-2Nb (LOW)2022-01-19	TESS		-0.28 ± 0.84	View & Get data
XO-2Nb (LOW)2022-01-17	TESS		-3.86 ± 1.05	View & Get data
XO-2Nb (LOW)2022-01-11	TESS		0.15 ± 0.76	View & Get data
XO-2Nb (LOW)2022-01-09	TESS		-0.89 ± 0.91	View & Get data
XO-2Nb (LOW)2022-01-06	TESS		-0.81 ± 1.12	View & Get data
XO-2Nb (LOW)2022-01-04	TESS		0.68 ± 0.79	View & Get data
XO-2Nb (LOW)2022-01-01	TESS		-0.69 ± 0.89	View & Get data
XO-2Nb (LOW)2020-01-18	TESS		0.58 ± 0.84	View & Get data
XO-2Nb (LOW)2020-01-15	TESS		0.45 ± 0.95	View & Get data
XO-2Nb (LOW)2020-01-13	TESS		0.49 ± 1.09	View & Get data
XO-2Nb (LOW)2020-01-10	TESS		-0.06 ± 1.01	View & Get data
XO-2Nb (LOW)2020-01-05	TESS		-0.02 ± 1.11	View & Get data
XO-2Nb (LOW)2020-01-02	TESS		1.11 ± 1.04	View & Get data
XO-2Nb (LOW)2019-12-30	TESS		1.98 ± 1.09	View & Get data
XO-2Nb (LOW)2019-12-25	TESS		-0.71 ± 1.01	View & Get data
Literature Mid-times
PlanetObservation Date	Reference		O-Cminutes
2017-02-17	Wang et al. 2021		-2.9 ± 1.44	View
2007-02-16	Burke et al. 2007		-0.23 ± 0.29	View

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XO-2Nb - ExoClock

Discovered by: Burke et al. 2007

Priorities

ExoClock Observations

Space Observations

Literature Mid-times

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