Recent

New minimum 5/1/2025

ET Boo

Milan Uhlar, JIRNY, 5/1/2025

QHY294, LNS200, OAT

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New observation 5/1/2025

ET Boo

Milan Uhlar, JIRNY, 4/30/2025

QHY294, LNS200, OAT

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New observation 5/3/2024

ET Boo

Milan Uhlar, JIRNY

QHY294, LNS200, OAT

QHY294, LNS200, OAT
filter: clear
temp: -10C
binning: 2x2
exp_time: 90sec.
equip.: QHY294
lens: 200/8

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New minimum 5/3/2024

QHY294, LNS200, OAT
filter: clear
temp: -10C
binning: 2x2
exp_time: 90sec.
equip.: QHY294
lens: 200/8

----- EBFit result: -----
Tmin = 2460433.35842
Error (1 sigma): +0.00068/-0.00066 (Bootstrapping), +0.00027/-0.00020 (Prayer bead), +0.00044/-0.00044 (LSM)
Error (95% CI): +0.00131/-0.00138 (Bootstrapping), +0.00045/-0.00055 (Prayer bead)
LSM: chi^2 = 57.1, n_freedom = 32

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New minimum 4/30/2023

ET Boo

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 = 2460064.71859
Error (1 sigma): +0.00022/-0.00021 (Bootstrapping), +0.00009/-0.00007 (Prayer bead), +0.00026/-0.00026 (LSM)
Error (95% CI): +0.00042/-0.00045 (Bootstrapping), +0.00016/-0.00010 (Prayer bead)
LSM: chi^2 = 33.1, n_freedom = 38

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New minimum 4/11/2023

ET Boo

Milan Uhlar, JIRNY

Canon 7D MarkII, LNS300, OAT

Canon 7D MarkII, LNS300, OAT
ISO1600, RGGB binning2x2, 110sec, F8

----- EBFit result: -----
Tmin = 2460045.36660
Error (1 sigma): +0.00045/-0.00043 (Bootstrapping), +0.00021/-0.00029 (Prayer bead), +0.00032/-0.00032 (LSM)
Error (95% CI): +0.00088/-0.00093 (Bootstrapping), +0.00067/-0.00049 (Prayer bead)
LSM: chi^2 = 117.7, n_freedom = 54

. . .

New observation 4/11/2023

ET Boo

Milan Uhlar, JIRNY

Canon 7D MarkII, LNS300, OAT

Canon 7D MarkII, LNS300, OAT
ISO1600, RGGB binning2x2, 110sec, F8

----- EBFit result: -----
TminGJD = 2460045.36673
Error (1 sigma): +0.00043/-0.00050 (Bootstrapping), +0.00026/-0.00030 (Prayer bead), +0.00033/-0.00033 (LSM)
Error (95% CI): +0.00095/-0.00095 (Bootstrapping), +0.00088/-0.00055 (Prayer bead)
LSM: chi^2 = 111.8, n_freedom = 48

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New minimum 4/28/2022

ET Boo

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 = 2459697.68862
Error (1 sigma): +0.00017/-0.00016 (Bootstrapping), +0.00003/-0.00003 (Prayer bead), +0.00018/-0.00018 (LSM)
Error (95% CI): +0.00032/-0.00033 (Bootstrapping), +0.00009/-0.00005 (Prayer bead)
LSM: chi^2 = 48.4, n_freedom = 53

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New minimum 3/30/2022

ET Boo

Milan Uhlar, JIRNY

Canon 7D MarkII, LNS 200mm, OAT

Canon 7D MarkII, LNS 200mm, OAT
iso200, 30sec, F5.0 binning 2x2 >>> merge 2 (60sec)

----- EBFit result: -----
Tmin = 2459667.37034
Error (1 sigma): +0.00137/-0.00134 (Bootstrapping), +0.00035/-0.00060 (Prayer bead), +0.00115/-0.00115 (LSM)
Error (95% CI): +0.00231/-0.00318 (Bootstrapping), +0.00108/-0.00176 (Prayer bead)
LSM: chi^2 = 48.3, n_freedom = 32

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New observation 3/30/2022

ET Boo

Milan Uhlar, JIRNY

Canon 7D MarkII, LNS 200mm, OAT

Canon 7D MarkII, LNS 200mm, OAT
iso200, 30sec, F5.0 binning 2x2 >>> merge 2 (60sec)

----- EBFit result: -----
TminGJD = 2459667.37037
Error (1 sigma): +0.00132/-0.00129 (Bootstrapping), +0.00033/-0.00054 (Prayer bead), +0.00114/-0.00114 (LSM)
Error (95% CI): +0.00249/-0.00310 (Bootstrapping), +0.00109/-0.00182 (Prayer bead)
LSM: chi^2 = 48.3, n_freedom = 32

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New minimum 12/22/2021

ET Boo

Sjoerd Dufoer, Brussels - Heliport

Vixen 20cm VMC200L

Vixen 20cm VMC200L

----- EBFit result: -----
Tmin = 2459570.61890
Error (1 sigma): +0.00039/-0.00039 (Bootstrapping), +0.00016/-0.00014 (Prayer bead), +0.00031/-0.00031 (LSM)
Error (95% CI): +0.00071/-0.00070 (Bootstrapping), +0.00028/-0.00030 (Prayer bead)
LSM: chi^2 = 177.8, n_freedom = 132

. . .

New minimum 5/25/2021

ET Boo

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 = 2459359.68834
Error (1 sigma): +0.00024/-0.00023 (Bootstrapping), +0.00013/-0.00011 (Prayer bead), +0.00030/-0.00030 (LSM)
Error (95% CI): +0.00045/-0.00046 (Bootstrapping), +0.00022/-0.00016 (Prayer bead)
LSM: chi^2 = 38.8, n_freedom = 44

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New minimum 2/16/2021

ET Boo

Sjoerd Dufoer, Brussels - Heliport

Vixen 20cm VMC200L

Vixen 20cm VMC200L

----- EBFit result: -----
Tmin = 2459258.41771
Error (1 sigma): +0.00038/-0.00032 (Bootstrapping), +0.00014/-0.00014 (Prayer bead), +0.00033/-0.00033 (LSM)
Error (95% CI): +0.00073/-0.00073 (Bootstrapping), +0.00026/-0.00024 (Prayer bead)
LSM: chi^2 = 167.4, n_freedom = 147

. . .

New minimum 8/10/2020

ET Boo

Urbaník M., Kysucká hvezdáreň

SKY-WATCHER NWT 150/750 + MII G2-8300

SKY-WATCHER NWT 150/750 + MII G2-8300
CCD+B,exp.34 s,comp.UCAC4 684-054616,2x2.

----- EBFit result: -----
Tmin = 2459071.35701
Error (1 sigma): +0.00030/-0.00041 (Bootstrapping), +0.00012/-0.00020 (Prayer bead), +0.00030/-0.00030 (LSM)
Error (95% CI): +0.00064/-0.00083 (Bootstrapping), +0.00020/-0.00030 (Prayer bead)
LSM: chi^2 = 92.8, n_freedom = 51

. . .

New minimum 8/10/2020

ET Boo

Urbaník M., Kysucká hvezdáreň

SKY-WATCHER NWT 150/750 + MII G2-8300

SKY-WATCHER NWT 150/750 + MII G2-8300
CCD+I,exp.20 s,comp.UCAC4 684-054616,2x2.

----- EBFit result: -----
Tmin = 2459071.35823
Error (1 sigma): +0.00070/-0.00065 (Bootstrapping), +0.00033/-0.00031 (Prayer bead), +0.00037/-0.00037 (LSM)
Error (95% CI): +0.00143/-0.00131 (Bootstrapping), +0.00043/-0.00044 (Prayer bead)
LSM: chi^2 = 120.4, n_freedom = 49

. . .

New minimum 8/10/2020

ET Boo

Urbaník M., Kysucká hvezdáreň

SKY-WATCHER NWT 150/750 + MII G2-8300

SKY-WATCHER NWT 150/750 + MII G2-8300
CCD+R,exp.16 s,comp.UCAC4 684-054616,2x2.

----- EBFit result: -----
Tmin = 2459071.35818
Error (1 sigma): +0.00037/-0.00036 (Bootstrapping), +0.00014/-0.00016 (Prayer bead), +0.00019/-0.00019 (LSM)
Error (95% CI): +0.00081/-0.00069 (Bootstrapping), +0.00032/-0.00028 (Prayer bead)
LSM: chi^2 = 180.6, n_freedom = 45

. . .

New minimum 8/10/2020

ET Boo

Urbaník M., Kysucká hvezdáreň

SKY-WATCHER NWT 150/750 + MII G2-8300

SKY-WATCHER NWT 150/750 + MII G2-8300
CCD+V,exp.25 s,comp.UCAC4 684-054616,2x2.

----- EBFit result: -----
Tmin = 2459071.35705
Error (1 sigma): +0.00040/-0.00038 (Bootstrapping), +0.00012/-0.00016 (Prayer bead), +0.00030/-0.00030 (LSM)
Error (95% CI): +0.00077/-0.00072 (Bootstrapping), +0.00023/-0.00027 (Prayer bead)
LSM: chi^2 = 94.3, n_freedom = 52

. . .

New observation 8/10/2020

ET Boo

Urbaník M., Kysucká hvezdáreň

SKY-WATCHER NWT 150/750 + MII G2-8300

SKY-WATCHER NWT 150/750 + MII G2-8300
CCD+I,exp.20 s,comp.UCAC4 684-054616,2x2.

. . .

New observation 8/10/2020

ET Boo

Urbaník M., Kysucká hvezdáreň

SKY-WATCHER NWT 150/750 + MII G2-8300

SKY-WATCHER NWT 150/750 + MII G2-8300
CCD+R,exp.16 s,comp.UCAC4 684-054616,2x2.

. . .

New observation 8/10/2020

ET Boo

Urbaník M., Kysucká hvezdáreň

SKY-WATCHER NWT 150/750 + MII G2-8300

SKY-WATCHER NWT 150/750 + MII G2-8300
CCD+V,exp.25 s,comp.UCAC4 684-054616,2x2.

. . .

New observation 8/10/2020

ET Boo

Urbaník M., Kysucká hvezdáreň

SKY-WATCHER NWT 150/750 + MII G2-8300

SKY-WATCHER NWT 150/750 + MII G2-8300
CCD+B,exp.34 s,comp.UCAC4 684-054616,2x2.

. . .

New minimum 3/27/2020

ET Boo

Filip Walter, Štefánik Observatory, Prague, Czech Republic

Skywatcher REF 102/600 + DSLR Canon 1000D

Skywatcher REF 102/600 + DSLR Canon 1000D
V2C9_90.800_G

Canon Bayer filter G

----- EBFit result: -----
Tmin = 2458933.63784
Error (1 sigma): +0.00023/-0.00026 (Bootstrapping), +0.00002/-0.00003 (Prayer bead), +0.00018/-0.00018 (LSM)
Error (95% CI): +0.00045/-0.00049 (Bootstrapping), +0.00007/-0.00008 (Prayer bead)
LSM: chi^2 = 127.5, n_freedom = 63

. . .

New observation 3/27/2020

ET Boo

Filip Walter, Štefánik Observatory, Prague, Czech Republic

Skywatcher REF 102/600 + DSLR Canon 1000D

Skywatcher REF 102/600 + DSLR Canon 1000D
V2C9_90.800_G

Canon Bayer filter G

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New minimum 3/27/2020

ET Boo

Filip Walter, Štefánik Observatory, Prague, Czech Republic

Skywatcher REF 102/600 + DSLR Canon 1000D

Skywatcher REF 102/600 + DSLR Canon 1000D
V2C9_90.800_C

----- EBFit result: -----
Tmin = 2458933.63766
Error (1 sigma): +0.00027/-0.00026 (Bootstrapping), +0.00012/-0.00016 (Prayer bead), +0.00017/-0.00017 (LSM)
Error (95% CI): +0.00051/-0.00051 (Bootstrapping), +0.00019/-0.00024 (Prayer bead)
LSM: chi^2 = 151.7, n_freedom = 61

. . .

New observation 3/27/2020

ET Boo

Filip Walter, Štefánik Observatory, Prague, Czech Republic

Skywatcher REF 102/600 + DSLR Canon 1000D

Skywatcher REF 102/600 + DSLR Canon 1000D
V2C9_90.800_C

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New minimum 4/19/2019

ET Boo

Pokorný P., Česká Lípa

Sonnar LNS 45/180 + Canon 600D

Sonnar LNS 45/180 + Canon 600D

----- EBFit result: -----
Tmin = 2458590.47523
Error (1 sigma): +0.00117/-0.00116 (Bootstrapping), +0.00085/-0.00060 (Prayer bead), +0.00072/-0.00072 (LSM)
Error (95% CI): +0.00231/-0.00222 (Bootstrapping), +0.00124/-0.00107 (Prayer bead)
LSM: chi^2 = 410.5, n_freedom = 221

. . .

New minimum 4/11/2019

ET Boo

Filip Walter, Štefánik Observatory, Prague, Czech Republic

Skywatcher REF 102/600 + Canon 1000D

Skywatcher REF 102/600 + Canon 1000D
Jasno, v druhé půli přechody oblačnosti.

V2_C9_60.200

----- EBFit result: -----
Tmin = 2458580.47912
Error (1 sigma): +0.00029/-0.00027 (Bootstrapping), +0.00011/-0.00011 (Prayer bead), +0.00018/-0.00018 (LSM)
Error (95% CI): +0.00055/-0.00059 (Bootstrapping), +0.00015/-0.00020 (Prayer bead)
LSM: chi^2 = 135.4, n_freedom = 47

. . .

New observation 4/11/2019

ET Boo

Filip Walter, Štefánik Observatory, Prague, Czech Republic

Skywatcher REF 102/600 + Canon 1000D

Skywatcher REF 102/600 + Canon 1000D
Jasno, v druhé půli přechody oblačnosti.

V2_C9_60.200

. . .

New observation 4/11/2019

ET Boo

Filip Walter, Štefánik Observatory, Prague, Czech Republic

Skywatcher REF 102/600 + Canon 1000D

Skywatcher REF 102/600 + Canon 1000D
Jasno, po přeložení ztráta pole.

V2_C9_60.200

. . .

New minimum 4/22/2015

ET Boo

Urbaník M., Čadca

ED 80/600,0.5x Reductor, G1 0300

ED 80/600,0.5x Reductor, G1 0300
----- EBFit result: -----
Tmin = 2457133.33502
Error (1 sigma): +0.00029/-0.00026 (Bootstrapping), +0.00011/-0.00011 (Prayer bead), +0.00019/-0.00019 (LSM)
Error (95% CI): +0.00054/-0.00053 (Bootstrapping), +0.00018/-0.00017 (Prayer bead)
LSM: chi^2 = 299.9, n_freedom = 150

. . .

New observation 4/22/2015

ET Boo

Urbaník M., Čadca

ED 80/600,0.5x Reductor, G1 0300

ED 80/600,0.5x Reductor, G1 0300

----- EBFit result: -----
TminGJD = 2457133.33497
Error (1 sigma): +0.00026/-0.00029 (Bootstrapping), +0.00010/-0.00011 (Prayer bead), +0.00019/-0.00019 (LSM)
Error (95% CI): +0.00051/-0.00058 (Bootstrapping), +0.00021/-0.00022 (Prayer bead)
LSM: chi^2 = 275.0, n_freedom = 141

. . .

New observation 5/9/2012

ET Boo

Marek Chrastina, Brno, MonteBoo

Newton 620/2780 + SBIG ST-8XME + BVRI

. . .

New observation 5/9/2012

ET Boo

Marek Chrastina, Brno, MonteBoo

Newton 620/2780 + SBIG ST-8XME + BVRI

. . .

New observation 5/9/2012

ET Boo

Marek Chrastina, Brno, MonteBoo

Newton 620/2780 + SBIG ST-8XME + BVRI

. . .

New observation 5/5/2009

ET Boo

Ladislav Šmelcer, Hvězdárna Valašské Meziříčí

Celestron 280/1765 + CCD ST7

Celestron 280/1765 + CCD ST7
předpověď primárního minima JDg=2454953.4245 - 22h11m UT (podle Mo=48500.442 per.=0,6450405 dne), pozorování po minimu, které nastává cca o 1h10m dříve

. . .

New observation 5/5/2009

ET Boo

Ladislav Šmelcer, Hvězdárna Valašské Meziříčí

Celestron 280/1765 + CCD ST7

Celestron 280/1765 + CCD ST7
předpověď primárního minima JDg=2454953.4245 - 22h11m UT (podle Mo=48500.442 per.=0,6450405 dne), pozorování po minimu, které nastává cca o 1h10m dříve

. . .

New observation 5/29/2008

ET Boo

Ladislav Šmelcer, Hvězdárna Valašské Meziříčí

Celestron 280/1765 + CCD ST7

Celestron 280/1765 + CCD ST7
předpověď prim. min. JDg=2454615.4765 - 23h25 min (podle Mo=48500.4420 per.=0.645046 dne)
minimum nastalo o 1h 12m dříve
exp. 120s

. . .

New observation 5/29/2008

ET Boo

Ladislav Šmelcer, Hvězdárna Valašské Meziříčí

Celestron 280/1765 + CCD ST7

Celestron 280/1765 + CCD ST7
předpověď prim. min. JDg=2454615.4765 - 23h25 min (podle Mo=48500.4420 per.=0.645046 dne)
minimum nastalo o 1h 11m dříve
exp. 120s

. . .

New minimum 5/29/2008