TESS eclipses near V345 Lac

I am searching public TESS Quick-Look Pipeline light curves around V345 Lacertae for eclipsing binaries the variable-star catalogs do not already describe. TESS pixels are 21 arcseconds wide, so a small telescope on the ground can do something TESS cannot: see which star actually fades.

TESS before launch. The four cameras are the dark hoods inside the sunshade. Side by side they watch a strip of sky 24 by 96 degrees, and one pixel is 21 arcseconds. Credit: Orbital ATK / NASA.

Where each sector looks

light curves on this page other sectors V345 Lac

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Drag the globe and click a sector. Each strip is four cameras, 24 degrees each. TESS stares at one sector for about 27 days, then steps to the next. The pale sectors in the first view are the original two-year plan. The red ones are sectors 16, 17, 56, 57, 76, 77, 83, and 84, which supplied the light curves on these pages. The footprints are the public tess-point planning pointings, not a measured image header. With JavaScript off, a still of NASA’s first-year drawing is shown instead. Star positions: d3-celestial, Olaf Frohn. Still: NASA Goddard / CI Lab.

The search is a set of growing circles on stars brighter than about V = 12.5. It started inside 0.60° of V345 Lac, then 0.71°, 0.80°, and 0.90°. A dip counts only when it repeats, is smooth, and sits on clean cadences. The same test also recovers known eclipsing binaries. Those are not listed here.

Five stars in that field are mine to follow up. One is already filed with the AAVSO Variable Star Index (VSX) and is waiting on a moderator. The others are notes, or a saved draft. A new VSX account can have only one new star in review, so the rest wait. Each of those pages has the research, the next two predicted eclipses, and a form if you can take data. V345 Lac was already catalogued. Its timing note, with the diagrams, is the last item in the list.

Wide field. V345 Lac is the center. The gold circle is the 0.9° search. East is left.

α Lac, β Lac, and the open cluster NGC 7243 are only there so the field has a landmark. The five finds sit inside the gold circle. Open the close chart to tell them apart, or use the list under it.

Close chart. Rings are the search as it grew: 0.60°, 0.71°, 0.80°, and 0.90°. Click a star.

The five eclipsing binaries

Sorted by the next predicted eclipse. TIC 330732812 has no period yet, so it stays after the stars that have one. V345 Lac is last. It is the known binary at the center of the search, and that page is a timing note on a published star.

TIC 330247030 · V = 11.4939 arcmin west of V345 Lac. EA, eclipses at both conjunctionsNext: 15 Oct 2026, 19:13 UTC · 15 Oct, 12:13 PDT Pacific · 15 Oct, 21:13 CEST central Europe
TIC 330739083 · V = 11.3135 arcmin northwest of V345 Lac. EA, primary only in the TESS dataNext: Window 16 Oct 2026, 08:02 to 16 Oct 2026, 22:45 UTC
TIC 330735422 · V = 11.7827 arcmin west of V345 Lac. EA, shallow primaryNext: 23 Oct 2026, 20:42 UTC · 23 Oct, 13:42 PDT Pacific · 23 Oct, 22:42 CEST central Europe
TIC 431033666 · V = 11.1052 arcmin south of V345 Lac. EA, flat-bottomed primary, 68 daysNext: 27 Oct 2026, 11:58 UTC · 27 Oct, 04:58 PDT Pacific · 27 Oct, 12:58 CET central Europe
TIC 330732812 · V = 11.3450 arcmin southwest of V345 Lac. EA, period not fixedNext eclipse: not predictable yet.
V345 Lac · V = 11.25Center of the search. Already a known eclipsing binary. Eccentric EA, known since before this searchNext: Primary 13 Oct 2026, 10:51 UTC · 13 Oct, 03:51 PDT Pacific · 13 Oct, 12:51 CEST central Europe

Times on these pages are predictions from TESS. The five new stars have not been checked from the ground yet.