exoclock

HAT-P-61b (LOW)

Discovered by: Bakos et al. 2021

The Star
Simbad
GAIA
2MASS		 HAT-P-61
DR2 256580182331399296
J05015525+5007526
RA 05:01:55.2577 DEC +50:07:52.574
Parallax
2.923 mas		 P.M. RA
-11.021 mas/y		 P.M. DEC
-21.44 mas/y
MagV
13.188		 MagR
12.974		 MagI*
12.259		 MagJ
11.598		 MagH
11.263		 MagK
11.141
MagG
12.939		 MagGBP
13.407		 MagGRP
12.336
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2459685.04073 ± 0.00017 BJDTDB
Period
1.90231296 ± 4.5e-07 days
Transit Parameters
Bakos et al. 2021
Rp/Rs
0.0984 ± 0.0025		 a/Rs
6.9 +0.13 -0.13
 i
83.62 +0.24 -0.24 deg
e
-		 ω
- deg
DepthR*
10.41 mmag		 Duration*
1.67 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Bakos et al. 2021
Teff
5587.0 +45.0 -45.0 K
 Log(g)
4.5 +0.02 -0.02 cm/s2
 Fe/H
0.194 +0.06 -0.06 dex
ExoClock Status
Observing Priority LOW
Minimum aperture 11.09"
Total Observations (Recent) 98 (30)
O-C 1.5 ± 0.26 minutes
ExoClock Observations (Recent) 77 (30)
Space Observations (Recent) 20 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 1 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.1072 ± 0.0013

HAT-P-61b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
HAT-P-61b (LOW)
2026-01-02		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 120.0		-4.58 ± 1.87
HAT-P-61b (LOW)
2025-12-31		samuel Diaz Lopez
Tomas Lopez (AstroCamp)		SCA260
ASI2600MM / rpr / 180.0		3.35 ± 2.59
HAT-P-61b (LOW)
2025-12-28		Matthieu Bachschmidt
Gonachon		Celestron C11
SBIG ST8XME / AstrodonExoPlanet-BB / 120.0		1.66 ± 1.44
HAT-P-61b (LOW)
2025-12-28		Livia Moretti
Leavitt Observatory		Ritchey-Chrétien 10'' f/8
QHY268 / I / 240.0		1.66 ± 3.89
HAT-P-61b (LOW)
2025-12-16		Yen-Hsing Lin
Starry House Observatory		Mewlon 300 CRS
ASI 6200MM Pro / Lum / 60.0		1.78 ± 2.02
HAT-P-61b (LOW)
2025-12-12		Tommaso Dittadi
TD-TRO		Ritchey-Chretien
Moravian G2-1600 / R / 240.0		0.52 ± 2.3
HAT-P-61b (LOW)
2025-12-12		Mercedes Correa
Sirius B		Meade
Moravian G2 1600 / R / 180.0		-3.37 ± 4.18
HAT-P-61b (LOW)
2025-12-10		David Bennett
Rickford Observatory		GSO RC
ZWO ASI2600MM Pro / Lum / 180.0		2.81 ± 1.34
HAT-P-61b (LOW)
2025-12-09		Gustavo Muler
OBSERVATORIO NAZARET J47		HYPERSTAR LX200
QHY 193 M / Clear / 40.0		3.87 ± 2.16
HAT-P-61b (LOW)
2025-11-21		Mark van der Grijp
Raspay Observatory		C9.25 HD
ZWO2600 MM Pro / Lum / 60.0		-0.29 ± 1.73
HAT-P-61b (LOW)
2025-11-20		David Bennett
Rickford Observatory		GSO RC
ZWO ASI2600MM Pro / Lum / 180.0		2.37 ± 1.09
HAT-P-61b (LOW)
2025-11-06		Yen-Hsing Lin
Starry House Observatory		Mewlon 300 CRS
ASI 6200MM Pro / Lum / 60.0		0.3 ± 2.59
HAT-P-61b (LOW)
2025-10-30		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / Lum / 150.0		1.67 ± 1.87
HAT-P-61b (LOW)
2025-10-09		Pieter Vuylsteke
Marvel (La Palma)		ASA Ritchey
ZWO 6200mm / rpr / 200.0		1.83 ± 0.92
HAT-P-61b (LOW)
2025-08-15		Vojtěch Školník
Broumov NM Observatory		Meade LX90 ACF
MI C2-7000A / Clear / 120.0		4.0 ± 3.17
HAT-P-61b (LOW)
2025-04-03		Ivo Peretto
MarSEC Marana Space Explorer Center		R-C
Moravia G2-1600 MkII / R / 120.0		5.3 ± 3.74
HAT-P-61b (LOW)
2025-04-03		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280/1850 (C11 with Starizona reducer)
Moravian Instruments G2-1600 / AstrodonExoPlanet-BB / 120.0		4.3 ± 1.44
HAT-P-61b (LOW)
2025-03-15		Michael Nezel
Celle Observatory		CDK 14
QHY 268M / R / 200.0		1.89 ± 1.87
HAT-P-61b (LOW)
2025-03-13		Laurent Miralabe
La Couyère		Meade
QSI 583 / Clear / 180.0		1.76 ± 2.02
HAT-P-61b (LOW)
2025-02-22		Alberto García Sánchez
Rio Cofio		MEADE LX200 Classic
SBIG ST8-XME / Clear / 180.0		7.86 ± 2.02
HAT-P-61b (LOW)
2025-02-22		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 200.0		3.39 ± 2.45
HAT-P-61b (LOW)
2025-02-03		Mario Morales-Aimar
Observatorio de Sencelles MPC K14		Reflector 10"
SBIG ST7-XME / Clear / 120.0		0.55 ± 1.58
HAT-P-61b (LOW)
2025-02-03		Trevor Gainey
Kismet		Meade LX200
ZWO ASI 294 MC Pro / R / 101.0		-1.75 ± 3.31
HAT-P-61b (LOW)
2025-02-01		Alberto García Sánchez
Rio Cofio		MEADE LX200 Classic
SBIG ST8-XME / Clear / 140.0		0.28 ± 2.02
HAT-P-61b (LOW)
2025-01-15		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 120.0		7.08 ± 1.73
HAT-P-61b (LOW)
2025-01-15		Ramon Naves
Montcabrer		Meade LX200 12" ACF
Moravian G4-9000 / rpr / 180.0		4.63 ± 2.74
HAT-P-61b (LOW)
2025-01-15		Jean-Claude MARIO
Bortle 45 observatory		T 520 Cassegrain Arp 83
Asi 6200MM / Clear / 180.0		1.6 ± 1.24
HAT-P-61b (LOW)
2025-01-15		Mario Morales-Aimar
Observatorio de Sencelles MPC K14		Reflector 10"
SBIG ST7-XME / Clear / 120.0		0.74 ± 2.45
HAT-P-61b (LOW)
2025-01-13		Jordi González-Edo
Landete-Kea		C11
ASI 2600MM pro / Lum / 120.0		1.05 ± 2.16
HAT-P-61b (LOW)
2025-01-13		Jean-Claude MARIO
Bortle 45 observatory		T 450 Newton Arp 83 FD3
Asi 6200MM / Clear / 90.0		-2.7 ± 2.59
HAT-P-61b (LOW)
2024-12-27		Mario Morales-Aimar
Observatorio de Sencelles MPC K14		10" Meade Schmidt Cassegrain
SBIG ST7-XME / Clear / 120.0		-2.24 ± 1.87
HAT-P-61b (LOW)
2024-12-25		Jean-Claude MARIO
Bortle 45 observatory		T 520 Cassegrain Arp 83
Asi 6200MM / Clear / 120.0		2.1 ± 1.24
HAT-P-61b (LOW)
2024-12-22		Deborah Smith
Complejo Astronomico Los Coloraos, Gorafe		C9.25
QHY9 / R / 200.0		3.0 ± 2.88
HAT-P-61b (LOW)
2024-12-05		Jean-Claude MARIO
Observatoire de la Cabergue		T 500 Cassegrain "Arp 83"
ASI 6200 MM / Clear / 180.0		0.86 ± 2.16
HAT-P-61b (LOW)
2024-12-05		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave 2
ZWO ASI6200 / R / 120.0		-3.17 ± 1.11
HAT-P-61b (LOW)
2024-11-29		Bryan Martin
Tiger Butte Observatory Remote		AG Optical IDK
ZWO ASI 294 / Lum / 180.0		6.39 ± 3.74
HAT-P-61b (LOW)
2024-10-29		Dim Stouraitis
Galilaios		SCT
SXVF-H9 Starlight-Xpress / Lum / 160.0		-1.37 ± 3.02
HAT-P-61b (LOW)
2024-10-08		Snaevarr Guðmundsson
Ness Observatory		Meade LX 200 ACF Schmidt-Cassegrain
SBIG STL 11000M / R / 120.0		-0.88 ± 2.74
HAT-P-61b (LOW)
2024-03-09		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280/1850 (C11 with Starizona reducer)
Moravian Instruments G2-1600 / AstrodonExoPlanet-BB / 120.0		-4.26 ± 1.73
HAT-P-61b (LOW)
2024-02-19		Javier Flores Martín
CAHA		GSO40
zwo 1600mm pro / Clear / 60.0		2.26 ± 2.45
HAT-P-61b (LOW)
2024-02-19		Javier Flores Martín
Calar Alto Hispano en Andalucia		Multi Array of Combinate Telescope (MARCOT)
ZWO1600MM / Lum / 60.0		0.39 ± 1.58
HAT-P-61b (LOW)
2024-02-19		Enrique Arce
Vallbona Observatory		Ritchey Chretien
ZWO ASI 294 MM PRO / Lum / 300.0		-0.91 ± 2.45
HAT-P-61b (LOW)
2024-01-29		Javier Flores Martín
CAHA		GSO40
zwo 1600mm pro / R / 120.0		4.77 ± 1.58
HAT-P-61b (LOW)
2024-01-29		Gustavo Muler
Obs. Nazaret J47		lx 200
ST8 XME AO8 / R / 180.0		3.26 ± 0.91
HAT-P-61b (LOW)
2024-01-29		Mercedes Correa
Teide Observatory		IAC80
Camelot2 / R / 120.0		2.03 ± 1.44
HAT-P-61b (LOW)
2024-01-16		Vikrant Kumar Agnihotri
Cepheid Observatory India		GSO Ritchey–Chrétien
Atik383L+ mono / Lum / 90.0		-3.02 ± 4.9
HAT-P-61b (LOW)
2024-01-12		Lionel Rousselot
Private observatory Vierzon		Newton 250/740
ZWO 533 monochrome / Lum / 120.0		-0.25 ± 2.02
HAT-P-61b (LOW)
2024-01-10		Mark Salisbury
POST		Orion Optics ODK
SBIG ST-10 XME / Clear / 240.0		2.85 ± 1.22
HAT-P-61b (LOW)
2024-01-10		Sonia J Rubie
Putlands Observatory		Meade LX200 Classic
SBIG ST8-XME / R / 300.0		2.65 ± 4.32
HAT-P-61b (LOW)
2023-12-28		Lee YuHsien
KMSH Observatory		C14HD
QSI-660 / Clear / 30.0		-3.12 ± 3.02
HAT-P-61b (LOW)
2023-12-24		Ioannis Gkolias
AUTH-3 hosted at S.P.I.C.A		RASA 11''
QHY163M / Lum / 60.0		2.39 ± 2.59
HAT-P-61b (LOW)
2023-12-03		Mario Morales-Aimar
Observatorio de Sencelles MPC K14		Reflector 10"
SBIG ST7-XME / Clear / 100.0		-0.86 ± 2.02
HAT-P-61b (LOW)
2023-11-11		Kevin Johnson
Holbrook Observatory		Meade LX50 10"
Atik 383L+ / Lum / 60.0		0.66 ± 1.87
HAT-P-61b (LOW)
2023-11-11		Martin Crow
Burnham Observatory		Celestron C9.25
SX694 mono / Clear / 180.0		-4.67 ± 3.31
HAT-P-61b (LOW)
2023-10-23		Pieter Vuylsteke
TheGardenToTheSkyFacility		TS ONTC 25cm f4.7
QHY 268M / rpr / 150.0		2.67 ± 1.32
HAT-P-61b (LOW)
2023-03-04		Ivo Peretto
MarSEC Marana Space Explorer Center		R-C
Moravia G2-1600 MkII / R / 120.0		4.99 ± 2.3
HAT-P-61b (LOW)
2023-03-04		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 180.0		-0.45 ± 1.32
HAT-P-61b (LOW)
2023-03-04		Dominique DANIEL
La Montjoie		T250 Skyvision
Camera CMOS ZWO ASI2600MC pro (color) / Clear / 180.0		-4.22 ± 5.62
HAT-P-61b (LOW)
2023-02-15		Francesco Scaggiante
Gruppo Astrofili Salese "GALILEO GALILEI"		NEWTON 410/1710
Custom made with KAF-1603ME CCD sensor / R / 80.0		0.12 ± 3.6
HAT-P-61b (LOW)
2023-02-13		Michael Irzyk
Melun		C14
H694 / Clear / 120.0		1.51 ± 1.3
HAT-P-61b (LOW)
2023-02-13		Kevin Johnson
Holbrook Observatory		Meade LX50 10"
Atik 383L+ / Clear / 270.0		0.38 ± 1.35
HAT-P-61b (LOW)
2023-02-12		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 120.0		-1.44 ± 1.12
HAT-P-61b (LOW)
2023-01-23		David Bennett
Rickford Observatory		GSO RC
ZWO ASI2600MM Pro / Lum / 150.0		-0.76 ± 1.44
HAT-P-61b (LOW)
2022-12-18		Francesco Scaggiante
Gruppo Astrofili Salese "GALILEO GALILEI"		NEWTON 410/1710
Custom made with KAF-1603ME CCD sensor / R / 60.0		-2.61 ± 3.6
HAT-P-61b (LOW)
2022-12-15		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 200.0		-2.58 ± 2.02
HAT-P-61b (LOW)
2022-11-29		Mario Morales-Aimar
Observatorio de Sencelles MPC K14		Reflector 10"
SBIG ST7-XME / Clear / 180.0		-1.56 ± 1.44
HAT-P-61b (LOW)
2022-11-27		Antonino Brosio
ABObservatory		Skywatcher Newton Quattro 300P
Atik 383 L / rpr / 240.0		-3.99 ± 2.16
HAT-P-61b (LOW)
2022-11-06		Marco Stefanini
Osservatorio Aldebaran		Ritchey-Chretien Altair Astro
Atik 4000 LE / Lum / 250.0		3.13 ± 3.89
HAT-P-61b (LOW)
2022-09-29		Martin Crow
Burnham Observatory		Celestron C9.25
SX694 mono / R / 150.0		2.2 ± 2.88
HAT-P-61b (LOW)
2022-09-26		Adam Popowicz
Otivar dome2		Newton 12" ASA
ASI ZWO 1600MM / R / 165.0		0.22 ± 2.3
HAT-P-61b (LOW)
2022-09-09		Dim Stouraitis
Galilaios		SCT
SXVF-H9 Starlight-Xpress / R / 120.0		2.84 ± 2.74
HAT-P-61b (LOW)
2022-03-19		Tõnis Eenmäe
Tartu Observatory		Planewave CDK 12.5
Apogee Alta U42 / Lum / 120.0		-0.56 ± 1.41
HAT-P-61b (LOW)
2022-02-28		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280 /1790 (Celestron C11 with reducer)
Moravian Instruments G2-1600 / Clear / 120.0		-1.18 ± 1.01
HAT-P-61b (LOW)
2022-02-28		Mercedes Correa
Sirius B		Meade
Moravian G2 1600 / R / 120.0		-1.9 ± 2.88
HAT-P-61b (LOW)
2022-02-26		Marc Serrau
A77 Dauban		Celestron 11
ST8-XME / Clear / 120.0		7.34 ± 4.32
HAT-P-61b (LOW)
2022-02-26		David Wright
Yorick (private observatory)		10" Ritchey-Chretien
QSI 683WSG-8 / R / 300.0		4.46 ± 4.32
HAT-P-61b (LOW)
2022-02-26		Lionel Rousselot
Private observatory Vierzon		Newton 250/1200
ZWO 1600 monochrome / Lum / 120.0		0.28 ± 2.02

Space Observations
Planet
Observation Date		 Mission O-C
minutes
HAT-P-61b (LOW)
2024-01-01		TESS4.9 ± 2.59
HAT-P-61b (LOW)
2023-12-30		TESS-0.69 ± 1.87
HAT-P-61b (LOW)
2023-12-28		TESS3.36 ± 1.73
HAT-P-61b (LOW)
2023-12-20		TESS0.41 ± 2.45
HAT-P-61b (LOW)
2023-12-19		TESS0.57 ± 2.02
HAT-P-61b (LOW)
2023-12-17		TESS-1.57 ± 2.16
HAT-P-61b (LOW)
2023-12-15		TESS0.9 ± 2.3
HAT-P-61b (LOW)
2023-12-13		TESS-1.39 ± 2.02
HAT-P-61b (LOW)
2023-12-11		TESS-1.51 ± 2.16
HAT-P-61b (LOW)
2022-12-22		TESS2.1 ± 2.02
HAT-P-61b (LOW)
2022-12-20		TESS0.67 ± 1.41
HAT-P-61b (LOW)
2022-12-18		TESS0.12 ± 3.31
HAT-P-61b (LOW)
2022-12-15		TESS-2.14 ± 1.87
HAT-P-61b (LOW)
2022-12-13		TESS-2.41 ± 1.87
HAT-P-61b (LOW)
2022-12-09		TESS-2.95 ± 2.16
HAT-P-61b (LOW)
2022-12-07		TESS3.69 ± 2.16
HAT-P-61b (LOW)
2022-12-05		TESS-0.18 ± 2.02
HAT-P-61b (LOW)
2022-12-03		TESS-1.6 ± 1.87
HAT-P-61b (LOW)
2022-12-01		TESS2.59 ± 2.45
HAT-P-61b (LOW)
2022-11-29		TESS1.75 ± 1.87

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2017-04-07 Bakos et al. 2021 0.22 ± 0.68
© 2019-2025 ExoClock Project - Privacy policy - Contact: exoclockproject@gmail.com
The ExoClock Project is managed by the PULSAR Non-profit Civil Law Company / Address: Pipsou 18A, 54627 Thessaloniki, Greece / VAT: EL996400186 / Tax Office: E Thessaloniki