Recent

New minimum 7/24/2026

YY CrB

Ivo Peretto, Oberon Observatory, 7/23/2026

Seestar S50

. . .

New observation 7/24/2026

YY CrB

Alessandro Giacobbe , 5/14/2026

Seestar S50

. . .

New observation 5/14/2026

YY CrB

Ivo Peretto, Oberon Observatory, 4/26/2026

Seestar S50

. . .

New observation 4/26/2026

YY CrB

Ivo Peretto, Oberon Observatory, 4/26/2026

Seestar S50

. . .

New observation 4/15/2026

YY CrB

Ivan Sergey, Polyani, near Molodechno, Belarus, 4/14/2026

200 mm Newton (SW), HEQ-5, Canon 400D, lens Tair-3 FS, lens Jupiter 21M (4/200),

200 mm Newton (SW), HEQ-5, Canon 400D, lens Tair-3 FS, lens Jupiter 21M (4/200),
Canon 5D MarkII+ Gelios 2/58 test

. . .

New minimum 3/7/2026

YY CrB

Ivo Peretto, Oberon Observatory, 3/7/2026

Seestar S50

. . .

New observation 3/7/2026

YY CrB

MarSEC, Oberon Observatory, 8/3/2025

Seestar S50

. . .

New observation 8/4/2025

YY CrB

MarSEC, Oberon Observatory, 7/21/2025

Seestar S50

. . .

New observation 7/22/2025

Meade RCT 250/2500 + Optec SSP-5a
PEP data in V

----- EBFit result: -----
Tmin = 2459726.67855
Error (1 sigma): +0.00014/-0.00014 (Bootstrapping), +0.00003/-0.00003 (Prayer bead), +0.00015/-0.00015 (LSM)
Error (95% CI): +0.00026/-0.00026 (Bootstrapping), +0.00004/-0.00004 (Prayer bead)
LSM: chi^2 = 41.3, n_freedom = 47

. . .

New minimum 6/30/2021

YY CrB

M. Magris, Opicina, Trieste, IT

REF 120/600 Archo + Orion 3G CCD + 0.5x Foc. reducer

REF 120/600 Archo + Orion 3G CCD + 0.5x Foc. reducer
----- EBFit result: -----
Tmin = 2459352.37456
Error (1 sigma): +0.00054/-0.00058 (Bootstrapping), +0.00088/-0.00105 (Prayer bead), +0.00007/-0.00007 (LSM)
Error (95% CI): +0.00102/-0.00112 (Bootstrapping), +0.00156/-0.00143 (Prayer bead)
LSM: chi^2 = 16127.5, n_freedom = 254

. . .

New minimum 5/18/2021

YY CrB

M. Magris, Opicina, Trieste, IT

REF 120/600 Archo + Orion 3G CCD + 0.5x Foc. reducer

REF 120/600 Archo + Orion 3G CCD + 0.5x Foc. reducer
----- EBFit result: -----
Tmin = 2459352.37462
Error (1 sigma): +0.00072/-0.00059 (Bootstrapping), +0.00102/-0.00094 (Prayer bead), +0.00007/-0.00007 (LSM)
Error (95% CI): +0.00228/-0.00115 (Bootstrapping), +0.00187/-0.00131 (Prayer bead)
LSM: chi^2 = 16037.5, n_freedom = 252

. . .

New minimum 2/24/2021

YY CrB

Sjoerd Dufoer, Brussels - Heliport

Vixen 20cm VMC200L

Vixen 20cm VMC200L

----- EBFit result: -----
Tmin = 2459269.53180
Error (1 sigma): +0.00034/-0.00035 (Bootstrapping), +0.00015/-0.00008 (Prayer bead), +0.00021/-0.00021 (LSM)
Error (95% CI): +0.00066/-0.00068 (Bootstrapping), +0.00026/-0.00029 (Prayer bead)
LSM: chi^2 = 387.0, n_freedom = 182

. . .

New observation 8/2/2020

YY CrB

Filip Walter, Štefánik Observatory, Prague, Czech Republic

Skywatcher REF 102/600 + DSLR Canon 1000D

Skywatcher REF 102/600 + DSLR Canon 1000D
20190524_V2C9_45.1600+90.200G2

Přechody oblačnosti, ukončeno

. . .

New minimum 7/31/2020

YY CrB

Gerald Persha, La Luz, NM 88337

Meade RCT 250/2500 + Optec SSP-5a

Meade RCT 250/2500 + Optec SSP-5a
PEP data in V

----- EBFit result: -----
Tmin = 2459061.67242
Error (1 sigma): +0.00012/-0.00012 (Bootstrapping), +0.00003/-0.00002 (Prayer bead), +0.00015/-0.00015 (LSM)
Error (95% CI): +0.00022/-0.00025 (Bootstrapping), +0.00005/-0.00003 (Prayer bead)
LSM: chi^2 = 29.5, n_freedom = 41

. . .

New minimum 4/30/2020

YY CrB

Nosáľ P., Vígľaš

NWT 150/600 + Canon 20D + MPCC mk.III

NWT 150/600 + Canon 20D + MPCC mk.III

----- EBFit result: -----
Tmin = 2458961.50452
Error (1 sigma): +0.00047/-0.00056 (Bootstrapping), +0.00105/-0.00095 (Prayer bead), +0.00011/-0.00011 (LSM)
Error (95% CI): +0.00083/-0.00214 (Bootstrapping), +0.00162/-0.00151 (Prayer bead)
LSM: chi^2 = 640.7, n_freedom = 26

----- EBFit result: -----
Tmin = 2458961.50452
Error (1 sigma): +0.00047/-0.00056 (Bootstrapping), +0.00105/-0.00095 (Prayer bead), +0.00011/-0.00011 (LSM)
Error (95% CI): +0.00083/-0.00214 (Bootstrapping), +0.00162/-0.00151 (Prayer bead)
LSM: chi^2 = 640.7, n_freedom = 26

. . .

New minimum 6/1/2019

YY CrB

Pokorný P., Česká Lípa

SW Evoguide 50ED, REF 50/242 + Canon 600D

SW Evoguide 50ED, REF 50/242 + Canon 600D

----- EBFit result: -----
Tmin = 2458633.52086
Error (1 sigma): +0.00042/-0.00045 (Bootstrapping), +0.00033/-0.00023 (Prayer bead), +0.00040/-0.00040 (LSM)
Error (95% CI): +0.00083/-0.00087 (Bootstrapping), +0.00053/-0.00061 (Prayer bead)
LSM: chi^2 = 125.0, n_freedom = 72

. . .

New minimum 5/1/2019

YY CrB

Ivan Sergey, Polyani, near Molodechno

Lens Jupiter-21+ Canon 350D

Lens Jupiter-21+ Canon 350D

----- EBFit result: -----
Tmin = 2458603.39670
Error (1 sigma): +0.00031/-0.00031 (Bootstrapping), +0.00010/-0.00012 (Prayer bead), +0.00009/-0.00009 (LSM)
Error (95% CI): +0.00059/-0.00062 (Bootstrapping), +0.00024/-0.00026 (Prayer bead)
LSM: chi^2 = 652.1, n_freedom = 72

. . .

New minimum 4/16/2019

YY CrB

Pokorný P., Česká Lípa

Sonnar LNS 45/180 + Canon 600D

Sonnar LNS 45/180 + Canon 600D

----- EBFit result: -----
Tmin = 2458589.46625
Error (1 sigma): +0.00050/-0.00048 (Bootstrapping), +0.00033/-0.00032 (Prayer bead), +0.00010/-0.00010 (LSM)
Error (95% CI): +0.00098/-0.00087 (Bootstrapping), +0.00048/-0.00049 (Prayer bead)
LSM: chi^2 = 3150.8, n_freedom = 129

. . .

New minimum 7/4/2018

YY CrB

Gerald Persha, Optec, Lowell, Michigan

Meade RCT 250/2500 + Optec SSP-5a

Meade RCT 250/2500 + Optec SSP-5a
PEP data in V

----- EBFit result: -----
Tmin = 2458303.65502
Error (1 sigma): +0.00037/-0.00025 (Bootstrapping), +0.00032/-0.00027 (Prayer bead), +0.00087/-0.00087 (LSM)
Error (95% CI): +0.00066/-0.00060 (Bootstrapping), +0.00059/-0.00043 (Prayer bead)
LSM: chi^2 = 3.2, n_freedom = 39

. . .

New observation 8/31/2017

YY CrB

Matúš Kamenec, Prešov

SkyWatcher Newton 150/750

SkyWatcher Newton 150/750
SkyWatcher Newton 150/750
CCD+C; exp 15s ISO 400
Newton + Canon + HER
Differential photometry with C-Munipack
V-C magnitudes

----- EBFit result: -----
TminGJD = 2457996.38932
Error (1 sigma): +0.00028/-0.00025 (Bootstrapping), +0.00007/-0.00006 (Prayer bead), +0.00012/-0.00012 (LSM)
Error (95% CI): +0.00054/-0.00051 (Bootstrapping), +0.00009/-0.00010 (Prayer bead)
LSM: chi^2 = 933.7, n_freedom = 174

. . .

New minimum 7/9/2017

YY CrB

Gerald Persha, Optec, Lowell, Michigan

Meade RCT 250/2500 + Optec SSP-5a

Meade RCT 250/2500 + Optec SSP-5a
PEP data in V

----- EBFit result: -----
Tmin = 2457943.66678
Error (1 sigma): +0.00015/-0.00016 (Bootstrapping), +0.00003/-0.00004 (Prayer bead), +0.00094/-0.00094 (LSM)
Error (95% CI): +0.00029/-0.00029 (Bootstrapping), +0.00006/-0.00008 (Prayer bead)
LSM: chi^2 = 1.4, n_freedom = 48

. . .

New observation 3/11/2017

YY CrB

Ladislav Červinka, Mladá Boleslav

R102/500 + Atik 314L+

R102/500 + Atik 314L+
P Min, low clouds

----- EBFit result: -----
TminGJD = 2457823.54422
Error (1 sigma): +0.00039/-0.00038 (Bootstrapping), +0.00037/-0.00050 (Prayer bead), +0.00017/-0.00017 (LSM)
Error (95% CI): +0.00084/-0.00074 (Bootstrapping), +0.00103/-0.00070 (Prayer bead)
LSM: chi^2 = 1109.7, n_freedom = 226

. . .

New minimum 3/11/2017

YY CrB

Ladislav Červinka, Mladá Boleslav

R102/500 + Atik 314L+

R102/500 + Atik 314L+
low clouds

----- EBFit result: -----
Tmin = 2457823.54452
Error (1 sigma): +0.00037/-0.00043 (Bootstrapping), +0.00053/-0.00073 (Prayer bead), +0.00018/-0.00018 (LSM)
Error (95% CI): +0.00073/-0.00083 (Bootstrapping), +0.00115/-0.00133 (Prayer bead)
LSM: chi^2 = 1141.2, n_freedom = 226

. . .

New observation 8/26/2014

YY CrB

Liška J., MUO Brno

RL 600/2780 mm, G2-4000

RL 600/2780 mm, G2-4000
predbezne, V

. . .

New observation 7/26/2014

YY CrB

Liška J., MUO Brno

RL 600/2780 mm, G2-4000

RL 600/2780 mm, G2-4000
predbezne,V

. . .

New observation 7/20/2014

YY CrB

Liška J., MUO Brno

RL 600/2780 mm, G2-4000

RL 600/2780 mm, G2-4000
predbezne, V

. . .

New observation 7/19/2014

YY CrB

Liška J., MUO Brno

RL 600/2780 mm, G2-4000

RL 600/2780 mm, G2-4000
predbezne

. . .

New observation 8/15/2013

YY CrB

Liška J., HaP Brno

Celestron CGE 1400 XLT (355/3910), G2-4000

Celestron CGE 1400 XLT (355/3910), G2-4000
predbezne

. . .

New observation 8/9/2013

YY CrB

Liška J., HaP Brno

Celestron CGE 1400 XLT (355/3910), G2-4000

Celestron CGE 1400 XLT (355/3910), G2-4000
predbezne

. . .

New observation 8/9/2013

YY CrB

Liška J., HaP Brno

Celestron CGE 1400 XLT (355/3910), G2-4000

Celestron CGE 1400 XLT (355/3910), G2-4000
predbezne

. . .

New observation 8/3/2013

YY CrB

Liška J., HaP Brno

Celestron CGE 1400 XLT (355/3910), G2-4000

Celestron CGE 1400 XLT (355/3910), G2-4000
predbezne

. . .

New observation 8/1/2013

YY CrB

Liška J., HaP Brno

Celestron CGE 1400 XLT (355/3910), G2-4000

Celestron CGE 1400 XLT (355/3910), G2-4000
exp 40s, Guiding, 2bin

. . .

New observation 7/22/2013

YY CrB

Liška J., HaP Brno

Celestron CGE 1400 XLT (355/3910), G2-4000

Celestron CGE 1400 XLT (355/3910), G2-4000
predbezne

. . .

New observation 7/17/2013

YY CrB

Liška J., HaP Brno

Celestron CGE 1400 XLT (355/3910), G2-4000

Celestron CGE 1400 XLT (355/3910), G2-4000
exp 15s, 25s, 2bin

. . .

New observation 7/10/2013

YY CrB

Liška J., HaP Brno

3.5/135, G2-0402, EQ1-Table Top

3.5/135, G2-0402, EQ1-Table Top
exp 20s, 1bin,
minimum je 2456480.54623 ccd s

. . .

New observation 9/29/2012

YY CrB

Pavol A. Dubovsky, AO Kolonica

photolense 400mm

photolense 400mm
TminHJD = 2456199.2609 +/- 0.0002; secondary minimum
CCD+R; exp 60s
photolense 400mm + MII G2-1600 + DPV
Ensamble photometry with C-Munipack and MCV, MainComp = HD142035, V=7.51, B-V=1.15
JD heliocentric, V-C magnitudes

. . .

New observation 8/10/2012

YY CrB

Pavol A. Dubovsky, AO Kolonica

photolense 400mm

photolense 400mm
TminHJD = 2456149.3666 +/- 0.0003

CCD+V; exp 60s

photolense 400mm + MII G2-1600 + DPV

Ensamble photometry with C-Munipack and MCV, MainComp = HD142035, V=7.51, B-V=1.15

JD heliocentric, V-C magnitudes

. . .

New observation 8/10/2012

YY CrB

Pavol A. Dubovsky, AO Kolonica

photolense 400mm

photolense 400mm
TminHJD = 2456149.3672 +/- 0.0002

CCD+R; exp 60s

photolense 400mm + MII G2-1600 + DPV

Ensamble photometry with C-Munipack and MCV, MainComp = HD142035, V=7.51, B-V=1.15

JD heliocentric, V-C magnitudes

. . .

New observation 3/29/2012

YY CrB

Pavol A. Dubovsky, AO Kolonica

photolense 400mm

photolense 400mm
TminHJD = 2456011.5475 +/- 0.0001

CCD+V; exp 60s

photolense 400mm + MII G2-1600 + DPV

Ensamble photometry with C-Munipack and MCV, MainComp = HD142035, V=7.51, B-V=1.15

JD heliocentric, V-C magnitudes

. . .

New observation 3/29/2012

YY CrB

Pavol A. Dubovsky, AO Kolonica

photolense 400mm

photolense 400mm
TminHJD = 2456011.5473 +/- 0.0001

CCD+R; exp 60s

photolense 400mm + MII G2-1600 + DPV

Ensamble photometry with C-Munipack and MCV, MainComp = HD142035, V=7.51, B-V=1.15

JD heliocentric, V-C magnitudes

. . .

New observation 3/19/2012

YY CrB

Pavol A. Dubovsky, AO Kolonica

photolense 400mm

photolense 400mm
TminHJD = 2456005.5229 +/- 0.0004

CCD+V; exp 60s

photolense 400mm + MII G2-1600 + DPV

Ensamble photometry with C-Munipack and MCV, MainComp = HD142035, V=7.51, B-V=1.15

JD heliocentric, V-C magnitudes

. . .

New observation 3/19/2012

YY CrB

Pavol A. Dubovsky, AO Kolonica

photolense 400mm

photolense 400mm
TminHJD = 2456005.5216 +/- 0.0004

CCD+R; exp 60s

photolense 400mm + MII G2-1600 + DPV

Ensamble photometry with C-Munipack and MCV, MainComp = HD142035, V=7.51, B-V=1.15

JD heliocentric, V-C magnitudes

. . .

New observation 3/7/2012

YY CrB

Pavol A. Dubovsky, AO Kolonica

photolense 400mm

photolense 400mm
TminHJD = 2455992.5311 +/- 0.0002
secondary minimum

CCD+V; exp 60s

photolense 400mm + MII G2-1600 + DPV

Ensamble photometry with C-Munipack and MCV, MainComp = HD142035, V=7.51, B-V=1.15

JD heliocentric, V-C magnitudes

. . .

New observation 3/7/2012

YY CrB

Pavol A. Dubovsky, AO Kolonica

photolense 400mm

photolense 400mm
TminHJD = 2455992.5310 +/- 0.0002
secondary minimum

CCD+R; exp 60s

photolense 400mm + MII G2-1600 + DPV

Ensamble photometry with C-Munipack and MCV, MainComp = HD142035, V=7.51, B-V=1.15

JD heliocentric, V-C magnitudes

. . .

New observation 3/3/2012

YY CrB

Pavol A. Dubovsky, AO Kolonica

photolense 400mm

photolense 400mm
TminHJD = 2455987.6363 +/- 0.0002
secondary minimum

CCD+V; exp 60s

photolense 400mm + MII G2-1600 + DPV

Ensamble photometry with C-Munipack and MCV, MainComp = HD142035, V=7.51, B-V=1.15

JD geocentric, V-C magnitudes

. . .

New observation 3/3/2012

YY CrB

Pavol A. Dubovsky, AO Kolonica

photolense 400mm

photolense 400mm
TminHJD = 2455987.6363 +/- 0.0002
secondary minimum

CCD+R; exp 60s

photolense 400mm + MII G2-1600 + DPV

Ensamble photometry with C-Munipack and MCV, MainComp = HD142035, V=7.51, B-V=1.15

JD geocentric, V-C magnitudes

. . .

New observation 8/12/2011

YY CrB

Petr Cagaš, BSO Zlín

Newton 250/1340, CGEM, G2-8300

Newton 250/1340, CGEM, G2-8300
TminGJD=2455784.4826 primary err=0.001

. . .

New minimum 8/4/2011

YY CrB

Petr Cagaš, BSO Zlín

Newton 250/1340, CGEM, G2-8300

. . .

New observation 8/4/2011

YY CrB

Petr Cagaš, BSO Zlín

Newton 250/1340, CGEM, G2-8300

Newton 250/1340, CGEM, G2-8300
TminGJD=2455776.3878 secondary
err=0.0001

. . .

New observation 4/15/2011

YY CrB

Pavol A. Dubovsky, AO Kolonica

photolense 400mm

photolense 400mm
TminHJD = 2455665.4931 +/- 0.0002

CCD+V; exp 30s;

photolense 400mm + Meade DSI pro + DPV

Comp: HD142035, V=7.51, B-V=1.15 (TYCHO-2)

JD geocentric, V-C magnitudes

. . .

New observation 8/19/2010

YY CrB

Pavol A. Dubovsky, AO Kolonica

photolense 400mm

photolense 400mm
TminHJD = 2455420.3565 +/- 0.0003

CCD+R; exp 60s

photolense 400mm + Starlight Express SXVF-H9 + DPV

Comp = HD142035, V=7.50, B-V=1.14 (HIPPARCOS)

JD geocentric, V-C magnitudes

. . .

New observation 6/9/2010

YY CrB

Pavol A. Dubovsky, AO Kolonica

photolense 400mm

photolense 400mm
TminHJD = 2455354.4579 +/- 0.0002

CCD+R; exp 60s

photolense 400mm + Starlight Express SXVF-H9 + DPV

Comp = HD142035, V=7.50, B-V=1.14 (HIPPARCOS)
JD geocentric; V-C magnitudes

. . .

New observation 4/27/2010

YY CrB

Pavol A. Dubovsky, AO Kolonica

photolense 400mm

photolense 400mm
TminHJD = 2455311.5309 +/- 0.0002

CCD+R; exp 60s

photolense 400mm + Starlight Express SXVF-H9 + DPV

Comp = HD142035, V=7.50, B-V=1.14 (HIPPARCOS)
JD geocentric; V-C magnitudes

. . .

New observation 3/12/2010

YY CrB

Pavol A. Dubovsky, AO Kolonica

photolense 2.8/180

photolense 2.8/180
TminHJD = 2455264.4622 +/- 0.0003

CCD+R; exp 60s; defocused

photolense 180mm + Meade DSI Pro II + DPV

Comp = HD142035 V=7.50, B-V=1.14 (HIPPARCOS)

JD geocentric, V-C magnitudes

. . .

New observation 2/2/2010

YY CrB

Pavol A. Dubovsky, AO Kolonica

photolense 2.8/180

photolense 2.8/180
TminHJD = 2455219.6525 +/- 0.0001

CCD+R; exp 30s

photolense 180mm + Meade DSI Pro II + DPV

Comp = HD142035 V=7.50, B-V=1.14 (HIPPARCOS)

JD geocentric, V-C magnitudes

. . .

New observation 1/20/2010

YY CrB

Pavol A. Dubovsky, AO Kolonica

photolense 2.8/180

photolense 2.8/180
CCD+R; exp 15s

photolense 180mm + Meade DSI Pro II + DPV

Comp = HD142035 V=7.50, B-V=1.14 (HIPPARCOS)

JD geocentric, V-C magnitudes

. . .

New observation 7/17/2008

YY CrB

Pavol A. Dubovsky, AO Kolonica

photolense 100/400

photolense 100/400
TminHJD = 2454632.4137 +/- 0.0003

CCD+CV; exp 30s; diaphragm 8.0

photolense 400mm + Meade DSI Pro + DPV

Comp = TYC3054-01131-1 V=10.64 B-V=1.08

JD geocentric; V-C magnitudes

. . .

New observation 7/17/2008

YY CrB

Pavol A. Dubovsky, AO Kolonica

photolense 100/400

photolense 100/400
CCD+Clear; exp 30s; diaphragm 8.0

photolense 400mm + Meade DSI Pro + DPV

Comp = HD142035 V=7.50 B-V=1.14 (HIPPARCOS)
JD geocentric; V-C magnitudes

. . .

New observation 2/27/2008