Recent

New transit 4/25/2026

HAT-P-4 b

Philippe LANGLET, 4/17/2026

Célestron 8, ASI294MM PRO, Filtre Luminance

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New observation 4/25/2026

HAT-P-4

Philippe LANGLET, 4/16/2026

Célestron 8, ASI294MM PRO, Filtre Luminance

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New transit 2/27/2026

HAT-P-4 b

Nikola Antonov, Meshtitsa, Pernik, Bulgaria, 2/27/2026

250 mm F/4.8 Newtonian, CMOS ASI533MM Pro, Bessel BVR Filters

250 mm F/4.8 Newtonian, CMOS ASI533MM Pro, Bessel BVR Filters
Meshtitsa 0.25-m f/4.8 Newtonian (R filter, 60s exp, fap 6-14-28)
2x2 bin; 1.28 arcsecs/pix; T CCD -20C; T Amb. -2C; H 61%; Mer. flip @ 0.643

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New observation 2/27/2026

HAT-P-4

Nikola Antonov, Meshtitsa, Pernik, Bulgaria, 2/26/2026

250 mm F/4.8 Newtonian, CMOS ASI533MM Pro, Bessel BVR Filters

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New transit 4/4/2025

HAT-P-4 b

Radovan Mrllák, Hvězdárna v Úpici, 4/2/2025

Reflektor 200/800 C2-7000

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New observation 4/4/2025

HAT-P-4

Radovan Mrllák, Hvězdárna v Úpici, 4/2/2025

Reflektor 200/800 C2-7000

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New transit 12/4/2024

HAT-P-4 b

Manfred Raetz, Privatsternwarte Herges-Hallenberg, 5/13/2024

SCT 280 / 1870 (C11 with Starizona reducer)+ CCD MII G2-1600

SCT 280 / 1870 (C11 with Starizona reducer)+ CCD MII G2-1600
filter : Astrodon ExoPlanet-BB (V to IR)

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New observation 12/4/2024

HAT-P-4

Manfred Raetz, Privatsternwarte Herges-Hallenberg, 5/13/2024

SCT 280 / 1870 (C11 with Starizona reducer)+ CCD MII G2-1600

SCT 280 / 1870 (C11 with Starizona reducer)+ CCD MII G2-1600
filter : Astrodon ExoPlanet-BB (V to IR)

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New transit 5/11/2023

HAT-P-4 b

Manfred Raetz, Privatsternwarte Herges-Hallenberg

SCT 280 / 1850 + CCD MI G2-1600

SCT 280 / 1850 + CCD MI G2-1600
filter : Astrodon ExoPlanet-BB (V to IR)

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New transit 5/2/2023

HAT-P-4 b

Lomoz F., Sedlčany

Zeiss 130/360+C3-61000

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New transit 5/1/2023

HAT-P-4 b

Yves Jongen, Rasteau Observatory

Plane-Wave CDK 17" & SBIG STXL 11002

Plane-Wave CDK 17" & SBIG STXL 11002
90 sec pics on Red filter. Acquisition interrupted by clouds.

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New transit 3/16/2023

HAT-P-4 b

Manfred Raetz, Privatsternwarte Herges-Hallenberg

SCT 280 / 1850 + CCD MI G2-1600

SCT 280 / 1850 + CCD MI G2-1600
filter : Astrodon ExoPlanet-BB (V to IR)

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New transit 4/26/2022

HAT-P-4 b

Manfred Raetz, Privatsternwarte Herges-Hallenberg

SCT 280 / 1790 + CCD MI G2-1600

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New transit 3/7/2021

HAT-P-4 b

Laurie Sibbald, Home Observatory

203mm SC ZWO 2600 MM

203mm SC ZWO 2600 MM
Scope: EDGEHD8
Camera: ZWO 2600MM Pro mono CMOS
Filter: UV IR Cut
60 secs at 100 Gain, 50 Offset.
Bin 1x1
Seeing conditions poor
OAG with ZWO 174MMmini.
4 Reference Stars

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New transit 7/8/2020

HAT-P-4 b

Anaël Wünsche, UAI B10 Baronnies Provencales Observatory

Cassegrain 430 mm + STL 11K

Cassegrain 430 mm + STL 11K
120s exposures. seeing 2". Clear filter. Multicomparison stars. Some clouds passing, loss of frames. Twilight at the beginning of transit.

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New transit 5/21/2020

HAT-P-4 b

Alberto García Sánchez, Rio Cofio Observatory

MEADE LX200 S/C 10" + SBIG ST8-XME

MEADE LX200 S/C 10" + SBIG ST8-XME
120 segundos. Clear Filter

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New transit 3/26/2020

HAT-P-4 b

Manfred Raetz, Privatsternwarte Herges-Hallenberg

SCT 280 / 1790 + CCD MI G2-1600

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New transit 5/1/2019

HAT-P-4 b

Veli-Pekka Hentunen, Taurus Hill Observatory (A95), Varkaus, Finland

C-14, Paramount MEII, ST-8XME

C-14, Paramount MEII, ST-8XME
60 sec exposures, clouds, bright north sky

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New transit 3/16/2019

HAT-P-4 b

Jean plazas, Ribot Observatory

C14 F/6 camera Sbig ST 10

C14 F/6 camera Sbig ST 10
pose 60s
average in the strong wind
stop 15 minutes before the end

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New transit 3/16/2019

HAT-P-4 b

Anael Wunsche, UAI B10 Baronnies Provencales Observatory

Cassegrain 430 mm + STL 11K

Cassegrain 430 mm + STL 11K
120 exposures, filter V, binning 1x1, slightly defocused, multicomparison stars

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New transit 8/5/2018

HAT-P-4 b

Wonseok Kang, Deokheung Optical Astronomy Observatory

NYSC 1m Tel. + FLI PL-16803 / PI SOPHIA-2048B

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New transit 4/25/2018

HAT-P-4 b

Marc Bretton, UAI B10 Baronnies Provençales Observatory

RC 82 cm - CCD FLI PL230

RC 82 cm - CCD FLI PL230
60 sec exposure filter LNIR binning 1x1 defocused and one comparison star

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New transit 4/22/2018

HAT-P-4 b

Matthieu BACHSCHMIDT, Ferme

C11 + SBIG ST8XME

C11 + SBIG ST8XME
BB exo filter

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New transit 4/20/2018

HAT-P-4 b

Yves Jongen, Rasteau observatory

PlaneWave CDK 17 SBIG STLX11002

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New transit 5/31/2017

HAT-P-4 b

Mark Salisbury, Private Observatory

400mm f6.8ODK, ST10XME, filter wheel & AO8.

400mm f6.8ODK, ST10XME, filter wheel & AO8.
Observations started and finished in twilight. Data binned x 2 for best fit, limb darkening 0.37 used.

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New transit 4/13/2017

HAT-P-4 b

David Molina, Rivas Vaciamadrid

S/C 203mm + CCD ST8xme

S/C 203mm + CCD ST8xme
180",bin 1x1,filter clear,6 comparison stars

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New transit 4/9/2017

HAT-P-4 b

Marc Bretton, UAI B10 Baronnies Provencales Observatory

RC 82 cm - CCD FLI PL230

RC 82 cm - CCD FLI PL230
60 sec exposure filter V binning 1x1 defocused and multi comparison stars

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New transit 5/17/2016

HAT-P-4 b

Marc Bretton, UAI B10 Baronnies Provençales Observatory

Cassegrain 430 mm + STL 11K

Cassegrain 430 mm + STL 11K
60 sec exposure filter clear binning 1x1 defocussed and multi comparison stars

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New transit 5/17/2016

HAT-P-4 b

Marc Bretton, UAI B10 Baronnies Provencales Observatory

RC 82 cm - CCD FLI PL230

RC 82 cm - CCD FLI PL230
60 sec exposure filter LNIR binning 1x1 defocussed 0.2 and multi comparison stars

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New transit 3/26/2016

HAT-P-4 b

David Molina, AnunakiObservatory/Madrid

S/C 203mm ST8xme

S/C 203mm ST8xme
120"

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New transit 3/20/2016

HAT-P-4 b

Veli-Pekka Hentunen, Taurus Hill Observatory (A95), Varkaus, Finland

Meade 16" ACF OTA, Paramount ME, SBIG ST-8XME

Meade 16" ACF OTA, Paramount ME, SBIG ST-8XME
601 unfiltered images, 30 sec exposures, seven comparison stars used, almost full moon

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New transit 2/12/2016

HAT-P-4 b

Francesco Scaggiante, Danilo Zardin, Gruppo Astrofili Salese Galileo Galilei S.M di Sala (Venezia ) ITALIA

Newton 410/1710 ccd Audine KAF1600 ME

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New transit 2/6/2016

HAT-P-4 b

David Molina, AnunakiObservatory/Madrid

S/C 2000mm ST8xme

S/C 2000mm ST8xme
120"
Show the output but not the input was cloudy

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New transit 11/5/2015

HAT-P-4 b

Stan Shadick, University of Saskatchewan Physics Roof Observatory, CANADA

Meade 10" LX200GPS; SBIG ST10XME CCD

Meade 10" LX200GPS; SBIG ST10XME CCD
Processed with artificial star at 8x5x10 at binning 2.
Used only reference stars C1-C9, C11.
Pier 3.

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New transit 6/28/2015

HAT-P-4 b

Marc Bretton, UAI B10 Baronnies Provencales Observatory

RC 82 cm - CCD FLI PL230

RC 82 cm - CCD FLI PL230
120 sec exposure binning 1x1 defocus multicomparison stars

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New observation 3/11/2015

HAT-P-4

Trnka J., Městská hvězdárna ve Slaném

200/1 000, ST-9E

200/1 000, ST-9E
TminHJD = 2457091.4334 +/- 0.00174

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New transit 3/11/2015

HAT-P-4 b

Trnka J., Městská hvězdárna ve Slaném

200/1 000, ST-9E

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New transit 4/3/2013

HAT-P-4 b

Veli-Pekka Hentunen, Taurus Hill Observatory, Varkaus, Finland

C-14 OTA, Paramount ME, SBIG ST-8XME

C-14 OTA, Paramount ME, SBIG ST-8XME
Corrected light curve model-fit of data. Differently calculated model-fit data was posted a few hours ago.

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New transit 4/3/2013

HAT-P-4 b

Veli-Pekka Hentunen, Taurus Hill Observatory

C-14 OTA, Paramount ME, SBIG ST-8XME

C-14 OTA, Paramount ME, SBIG ST-8XME
279 R filter images, 60 sec exposure time, 3 comparison star

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New transit 7/8/2012

HAT-P-4 b

Stan Shadick, University of Saskatchewan Physics Roof Observatory

Meade 12\\\" LX200; SBIG ST10XME CCD

Meade 12\\\" LX200; SBIG ST10XME CCD
Processed with artifical star at 8x4x10 at binning 2.
Used only reference stars C1, C2, C5, C8, C10.
Pier 5.

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New observation 5/20/2012

HAT-P-4

Trnka J., Městská hvězdárna Slaný MPC C11

200/1 000, ST-9E

200/1 000, ST-9E
TminHJD = 2456067.50139 +/- 0.00254

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New transit 5/20/2012

HAT-P-4 b

Trnka J., Městská hvězdárna Slaný MPC C11

200/1 000, ST-9E

200/1 000, ST-9E
exp. 50 sec

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New transit 4/11/2012

HAT-P-4 b

Stan Shadick, University of Saskatchewan Physics Roof Observatory

Meade 12\\\" LX200; SBIG ST10XME CCD

Meade 12\\\" LX200; SBIG ST10XME CCD
CBB FILTER.
Processed using artificial star at 8x4x10 at binning 2.
Used only reference stars C1, C2, C4-C7, C9-C11, C13.
Pier 5

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New transit 4/10/2012

HAT-P-4 b

Stan Shadick, University of Saskatchewan Physics Roof Observatory

Meade 10\\\" LX200GPS; SBIG ST10XME CCD

Meade 10\\\" LX200GPS; SBIG ST10XME CCD
Processed with artificial star at 8x4x10 at binning 2.
Used only reference stars C1, C3, C5,C6,C9-C12, C14.
Pier 3.
Simultaneous observation with another dataset from pier 5 with cbb filter.

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New transit 3/31/2012

HAT-P-4 b

Fernand Emering, Abweiler Observatoy

Newton 0.45m Canon EOS 1000D

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New transit 5/19/2011

HAT-P-4 b

Shawn Dvorak, Rolling Hills Observatory (RHO)

Meade LX200-10

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New observation 5/4/2011

HAT-P-4

Trnka J., Městská hvězdárna Slaný MPC C11

Newton 200/1000, G2-1600

Newton 200/1000, G2-1600
TminHJD = 2455685.43798 +/- 0.00142

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New transit 5/4/2011

HAT-P-4 b

Trnka J., Městská hvězdárna Slaný MPC C11

Newton 200/1000, G2-1600

Newton 200/1000, G2-1600
exp. 50 sec.

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New transit 5/6/2010

HAT-P-4 b

Anthony Ayiomamitis, private observatory

AP160/f7.5 refractor, AP1200GTO GEM, SBIG ST-10XME, SBIG Lum filter

AP160/f7.5 refractor, AP1200GTO GEM, SBIG ST-10XME, SBIG Lum filter
Further details at http://www.perseus.gr/Astro-Photometry-HAT-P-4-20100422.htm

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New transit 4/23/2010

HAT-P-4 b

František Lomoz, Sedlčany

Newton-Schmidt 254/1016+ST2000XM

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New transit 4/21/2010

HAT-P-4 b

roberto zambelli, roberto zambelli observatory

meade lx200 gps 10\\\" CCD sbig st 8 xe

meade lx200 gps 10\\\" CCD sbig st 8 xe
used filter = G 495 baader

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New transit 4/2/2010

HAT-P-4 b

Stan Shadick, University of Saskatchewan Physics Roof Observatory

Meade 12\\\\\\\" LX200; SBIG ST9ECCD

Meade 12\\\\\\\" LX200; SBIG ST9ECCD
used 16 reference stars with Bruce Gary\\\'s Artificial Star Spreadsheet technique 7X1X7 ApertureXGapXAnnulus

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New observation 4/14/2009

HAT-P-4

Luboš Brát, ALTAN.Observatory

RL200, f/6 + ST8, guider RF80/600+G1-0300

RL200, f/6 + ST8, guider RF80/600+G1-0300
pouze první polovina tranzitu, složeno s pozorováním egressu před 4 cykly

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New observation 4/12/2009

HAT-P-4

Trnka J., Městská hvězdárna ve Slaném

Newton 200/1000 CCD ST-9E

Newton 200/1000 CCD ST-9E
transiting exoplanet, exposure 50 seconds, no autoguiding, clear filter, TminHJD = 2454933.52865 +/- 0.00114

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New transit 4/12/2009

HAT-P-4 b

Trnka J., Městská hvězdárna ve Slaném

Newton 200/1000 CCD ST-9E

Newton 200/1000 CCD ST-9E
50s exposure, no autoguiding

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New transit 4/12/2009

HAT-P-4 b

Luboš Brát, ALTAN.Observatory

RL200, f/6 + ST8, guider RF80/600+G1-0300

RL200, f/6 + ST8, guider RF80/600+G1-0300
180s exposure with autoguiding, only a first half of transit captured, superposited with observation from 30th March 2009 (4 cycles ago), where egress was captured. Per = 3.056536d was used for superpositing. No vertical shifts were applied to the data.

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New transit 4/10/2009

HAT-P-4 b

Tomáš Hynek, T. Hynek, HaP JP Ostrava

12 Meade LX200GPS (f/6.3), ST8-XME (2x2 bin)

12 Meade LX200GPS (f/6.3), ST8-XME (2x2 bin)
Ke konci pozorování mraky.

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New observation 4/3/2009

HAT-P-4

Václav Přibík, Hinata-sou Zlín

Newton 254/1200, CCD G2-1600, EQ6

Newton 254/1200, CCD G2-1600, EQ6
Jen vystup, ujizdela montaz, fit na model

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New observation 3/31/2009

HAT-P-4

Luboš Brát, ALTAN.Observatory

RL200, f/6 + ST8, guider RF80/600+G1-0300

RL200, f/6 + ST8, guider RF80/600+G1-0300
180s exposure with autoguiding, See model fit

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New transit 3/31/2009

HAT-P-4 b

Luboš Brát, ALTAN.Observatory

RL200, f/6 + ST8, guider RF80/600+G1-0300

RL200, f/6 + ST8, guider RF80/600+G1-0300
180s exposure with autoguiding, only egress captured, lenght 253 minutes adopted to find out midtransit time

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New exoplanet 1/1/1970

HAT-P-4 b

admin

RA: 15h 19m 57.92s, DE: +36° 13' 46.74"

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New star 1/1/1970

HAT-P-4

admin

RA: 15h 19m 57.92s, DE: +36° 13' 46.74", MAG (max): 11.210 (V)

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