SKY-WATCHER NWT 150/750 + MII G2-8300
CCD+B,exp.70 s,comp. UCAC4-495-0936683,2x2.

HEQ-5, Canon 400D, lens Tair-3 FS (4.5/300)
Lens 4.5/300

HEQ-5, Canon 400D, lens Tair-3 FS (4.5/300)
Lens 3.5/135

William Optics RedCat 51 (51 mm aperture, 250 mm focal length); ZWO ASI1600MM Pro, gain 139, offset 10, 1x1 binning, -10 C. Optolong 1.25-inch H-alpha 7 nm, [O III] 6.5 nm and [S II] 6.5 nm filters; ZWO EFW.
CL Aur, 2026-10-17 UTC; 14 retained exposures through H-alpha. Optolong 1.25-inch narrowband filter; nominal FWHM 7 nm (HASIIOIII-125 set). JD values are UTC exposure midpoints, uncorrected (not HJD/BJD). Relative ensemble magnitudes: this target's Oct 18 median is set to zero separately in each filter. This reference level is not a verified out-of-eclipse maximum; these are not standard magnitudes. Filters must remain separate.
Native-pixel dark/flat calibrated aperture photometry: radius 5 px (~15.8 arcsec), sky annulus 12-18 px; checked at 7/9 px and with an independent ensemble. Clouds/uncertain intervals excluded. Satellite-trail affected comparison measurements masked; target aperture unaffected.
Empirical check-star uncertainty (mag), in file row order: 0.0672, 0.0395, 0.0395, 0.0395, 0.0395, 0.0395, 0.0395, 0.0395, 0.0674, 0.0673, 0.0566, 0.0505, 0.0467, 0.0395.
Finding-chart labels below map local field IDs to Gaia DR3 source IDs. Gaia magnitudes identify stars only, not narrowband calibration. C=comparison ensemble; K=independent checks.
C: 828=181924987776412032, 2069=181904818609997568, 2048=182124278554551808, 483=182124381633760384, 1816=181532187246360192, 1488=181914061379613440, 794=181920628384666496, 2027=181915680582371584, 751=181859021373889664, 1131=181531568771070592, 1802=181903341138928000, 1445=181956358216236416, 667=181529889439234816, 411=181527651760898432, 883=181944778984398208, 461=181863934816447744, 1466=181867847531508736, 381=181864450212510720, 1841=182149704760896128, 1876=181938873405714816.
K: 1338=181962061932803456, 682=181938598527811712, 1618=182150323236181120, 2003=181852527383372032, 1144=182151177931992320, 684=181939079564130816, 806=181853145858644352, 442=181477937515914368, 2248=181941931422379392, 818=182151796407282560, 1120=181861804512632704, 1261=181851427871877120, 591=181476150808390912, 808=181852733541800320, 2078=181940724536592640, 620=181841600986534400, 532=182154893081375232, 1087=181947527763469824, 584=182167640544313344, 1368=182152689760476416.
Oct 17 shows a likely secondary eclipse. No precision minimum, period change or discovery is claimed. Raw frames, calibrations, rich CSVs and full reduction provenance are retained.

William Optics RedCat 51 (51 mm aperture, 250 mm focal length); ZWO ASI1600MM Pro, gain 139, offset 10, 1x1 binning, -10 C. Optolong 1.25-inch H-alpha 7 nm, [O III] 6.5 nm and [S II] 6.5 nm filters; ZWO EFW.
NSVS 6869020, 2026-10-18 UTC; 9 retained exposures through [O III]. Optolong 1.25-inch narrowband filter; nominal FWHM 6.5 nm (HASIIOIII-125 set). JD values are UTC exposure midpoints, uncorrected (not HJD/BJD). Relative ensemble magnitudes: this target's Oct 18 median is set to zero separately in each filter. This reference level is not a verified out-of-eclipse maximum; these are not standard magnitudes. Filters must remain separate.
Native-pixel dark/flat calibrated aperture photometry: radius 5 px (~15.8 arcsec), sky annulus 12-18 px; checked at 7/9 px and with an independent ensemble. Clouds/uncertain intervals excluded. Satellite-trail affected comparison measurements masked; target aperture unaffected.
Empirical check-star uncertainty (mag), in file row order: 0.0346, 0.0273, 0.0273, 0.0273, 0.0287, 0.0273, 0.0273, 0.0273, 0.0273.
Finding-chart labels below map local field IDs to Gaia DR3 source IDs. Gaia magnitudes identify stars only, not narrowband calibration. C=comparison ensemble; K=independent checks.
C: 611=182042498078612480, 195=182042193139470720, 698=182091258845865856, 227=182038310490246272, 733=182034011223245312, 1524=183526323383110784, 207=183601953462414848, 187=182087062659275136, 562=182105857436159104, 1327=183532065754594432, 1260=182084176441260032, 322=182085383330710272, 260=183600647793159296, 1111=183551753884620544, 1312=182016075442742656, 434=183604152486555520, 1342=182016556479080064, 249=182773265294445440, 345=182773986847626368, 1293=182060021545192320.
K: 592=183534810238483072, 360=182782336263998720, 341=183563053941908224, 1156=182290369232747904, 467=182806211986555136, 1714=182006008036491392, 1462=183633083385058176, 678=183565012446992000, 246=182805700886058496, 940=183632391892421248, 458=183645933927205504, 1042=181251816077827840, 387=183633804940664832, 331=181998521912286592, 651=183645762128502016, 436=182764984596537216, 690=183627036071109760, 613=183645899567450368, 1333=181253976444979456, 177=182749625793701120.
Known variable; no new period, precise event timing or discovery is claimed. Raw frames, calibrations, rich CSVs and full reduction provenance are retained.

William Optics RedCat 51 (51 mm aperture, 250 mm focal length); ZWO ASI1600MM Pro, gain 139, offset 10, 1x1 binning, -10 C. Optolong 1.25-inch H-alpha 7 nm, [O III] 6.5 nm and [S II] 6.5 nm filters; ZWO EFW.
NSVS 6869020, 2026-10-17 UTC; 14 retained exposures through [O III]. Optolong 1.25-inch narrowband filter; nominal FWHM 6.5 nm (HASIIOIII-125 set). JD values are UTC exposure midpoints, uncorrected (not HJD/BJD). Relative ensemble magnitudes: this target's Oct 18 median is set to zero separately in each filter. This reference level is not a verified out-of-eclipse maximum; these are not standard magnitudes. Filters must remain separate.
Native-pixel dark/flat calibrated aperture photometry: radius 5 px (~15.8 arcsec), sky annulus 12-18 px; checked at 7/9 px and with an independent ensemble. Clouds/uncertain intervals excluded. Satellite-trail affected comparison measurements masked; target aperture unaffected.
Empirical check-star uncertainty (mag), in file row order: 0.0507, 0.0273, 0.0273, 0.0273, 0.0273, 0.0279, 0.0273, 0.0330, 0.0273, 0.0273, 0.0273, 0.0273, 0.0293, 0.0273.
Finding-chart labels below map local field IDs to Gaia DR3 source IDs. Gaia magnitudes identify stars only, not narrowband calibration. C=comparison ensemble; K=independent checks.
C: 611=182042498078612480, 195=182042193139470720, 698=182091258845865856, 227=182038310490246272, 733=182034011223245312, 1524=183526323383110784, 207=183601953462414848, 187=182087062659275136, 562=182105857436159104, 1327=183532065754594432, 1260=182084176441260032, 322=182085383330710272, 260=183600647793159296, 1111=183551753884620544, 1312=182016075442742656, 434=183604152486555520, 1342=182016556479080064, 249=182773265294445440, 345=182773986847626368, 1293=182060021545192320.
K: 592=183534810238483072, 360=182782336263998720, 341=183563053941908224, 1156=182290369232747904, 467=182806211986555136, 1714=182006008036491392, 1462=183633083385058176, 678=183565012446992000, 246=182805700886058496, 940=183632391892421248, 458=183645933927205504, 1042=181251816077827840, 387=183633804940664832, 331=181998521912286592, 651=183645762128502016, 436=182764984596537216, 690=183627036071109760, 613=183645899567450368, 1333=181253976444979456, 177=182749625793701120.
Known variable; no new period, precise event timing or discovery is claimed. Raw frames, calibrations, rich CSVs and full reduction provenance are retained.

William Optics RedCat 51 (51 mm aperture, 250 mm focal length); ZWO ASI1600MM Pro, gain 139, offset 10, 1x1 binning, -10 C. Optolong 1.25-inch H-alpha 7 nm, [O III] 6.5 nm and [S II] 6.5 nm filters; ZWO EFW.
CL Aur, 2026-10-17 UTC; 14 retained exposures through H-alpha. Optolong 1.25-inch narrowband filter; nominal FWHM 7 nm (HASIIOIII-125 set). JD values are UTC exposure midpoints, uncorrected (not HJD/BJD). Relative ensemble magnitudes: this target's Oct 18 median is set to zero separately in each filter. This reference level is not a verified out-of-eclipse maximum; these are not standard magnitudes. Filters must remain separate.
Native-pixel dark/flat calibrated aperture photometry: radius 5 px (~15.8 arcsec), sky annulus 12-18 px; checked at 7/9 px and with an independent ensemble. Clouds/uncertain intervals excluded. Satellite-trail affected comparison measurements masked; target aperture unaffected.
Empirical check-star uncertainty (mag), in file row order: 0.0672, 0.0395, 0.0395, 0.0395, 0.0395, 0.0395, 0.0395, 0.0395, 0.0674, 0.0673, 0.0566, 0.0505, 0.0467, 0.0395.
Finding-chart labels below map local field IDs to Gaia DR3 source IDs. Gaia magnitudes identify stars only, not narrowband calibration. C=comparison ensemble; K=independent checks.
C: 828=181924987776412032, 2069=181904818609997568, 2048=182124278554551808, 483=182124381633760384, 1816=181532187246360192, 1488=181914061379613440, 794=181920628384666496, 2027=181915680582371584, 751=181859021373889664, 1131=181531568771070592, 1802=181903341138928000, 1445=181956358216236416, 667=181529889439234816, 411=181527651760898432, 883=181944778984398208, 461=181863934816447744, 1466=181867847531508736, 381=181864450212510720, 1841=182149704760896128, 1876=181938873405714816.
K: 1338=181962061932803456, 682=181938598527811712, 1618=182150323236181120, 2003=181852527383372032, 1144=182151177931992320, 684=181939079564130816, 806=181853145858644352, 442=181477937515914368, 2248=181941931422379392, 818=182151796407282560, 1120=181861804512632704, 1261=181851427871877120, 591=181476150808390912, 808=181852733541800320, 2078=181940724536592640, 620=181841600986534400, 532=182154893081375232, 1087=181947527763469824, 584=182167640544313344, 1368=182152689760476416.
Oct 17 shows a likely secondary eclipse. No precision minimum, period change or discovery is claimed. Raw frames, calibrations, rich CSVs and full reduction provenance are retained.

Mewlon 300 CRS, ASI6200MM Pro
gap due to meridian flip

Mewlon 300 CRS, ASI6200MM Pro
gap due to meridian flip

Pentacon 4/200 G.D.R. + MII G2 1600
cirry

Pentacon 4/200 G.D.R. + MII G2 1600
cirry

SkyWatcher150/750, G2-1600
some clouds in first part of observation

SkyWatcher150/750, G2-1600
some clouds in first part of observation

SkyWatcher Newton 102/500
Observatory>Presov
#Observer>Matus Kamenec
#Telescope>SkyWatcher 102/500 / EQ3-2 GoTo
#Instrument>Canon EOS 500D
#Filter>Clear (RAW RGGB)
#Exposure>30s ISO 1600
#Target>V651 Cas
#Position>
#MainComp>
#Source>
#Magnitude system>
#Time system>JD geocentric
#Reduction>
#Comment>

----- EBFit result: -----
TminGJD = 2459513.44046
Error (1 sigma): +0.00007/-0.00009 (Bootstrapping), +0.00005/-0.00007 (Prayer bead), +0.00005/-0.00005 (LSM)
Error (95% CI): +0.00016/-0.00016 (Bootstrapping), +0.00009/-0.00010 (Prayer bead)
LSM: chi^2 = 246.6, n_freedom = 105

SCT 280 / 1870 (C11 with Starizona reducer) CCD: MII G2-1600 filter : Ic
detrended with AstroImageJ 6.0.10.00

Seestar S50.
6-10s sub stack (60s total)

Seestar S50.
6-10s sub stack (60s total)

200 mm Newton (SW), HEQ-5, Canon 400D, lens Tair-3 FS, lens Jupiter 21M (4/200),
Lens 4.5/300

200 mm Newton (SW), HEQ-5, Canon 400D, lens Tair-3 FS, lens Jupiter 21M (4/200),
Lens 4.5/300

Planewave 12.5", CCD SBIG 3200, Filters BVRI,
A difficult observation. Very close to pole. Image rotation with diffraction spike passing through the target