Note:

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.