TIC 330247030

TYC 3986-528-1 · Gaia DR3 2005420908854866432

Position: 22h 14m 23.88s, +54° 29′ 26.1″
V magnitude: 11.49
Where: 39 arcmin west of V345 Lac
Signal: EA, eclipses at both conjunctions. Primary about 11 percent. Secondary about 7.5 percent.

What TESS shows

Eleven primary minima in sectors 16, 17, 56, 57, 83, and 84 give

BJD 2458758.683 + 12.47873 E

The primary is 10.8 to 11.4 percent deep. A secondary at phase 0.501 is 7.2 to 7.6 percent deep. The minima are V-shaped and last about 0.40 days from start to end. The primary times scatter by 8 minutes rms and 19 minutes at worst.

VSX already lists this star as a Gaia variable of unspecified type, period 0.0246243 days, range 11.22 to 11.36 in G. The TESS 200-second light curve outside eclipse is flat at the 0.2 percent level and does not show that short period. The 12.5-day eclipses are the new result. The TIC contamination ratio is 0.31, and no centroid test has been done, so a neighbor inside the aperture is not ruled out. That revision is saved as a VSX draft. The public entry is still the 35-minute period.

The light curves

TESS sectors with the eclipse times marked.

Phase fold on the 12.47873-day period.

Finder chart

Real sky images (DSS2 red) with Gaia DR3 stars overlaid. North is up, east is left, J2000. Red tick marks point at the target (Gaia DR3 2005420908854866432, G = 11.23). Gold squares C1 to C5 are comparison stars of similar brightness. Tap an image for the full-size printable chart.

Wide finder, 30 × 30 arcmin, for star-hopping.

Close finder, 8 × 8 arcmin, to pick out the target.

	Gaia DR3	RA, Dec (J2000)	G	BP	RP	From target
C1	2005796220278544640	22:14:42.8 +54:30:48.2	11.04	11.12	10.86	3.1′
C2	2005419328306676096	22:13:58.7 +54:22:42.4	12.18	12.50	11.70	7.7′
C3	2005431010622628992	22:13:33.9 +54:26:35.5	10.49	10.75	10.07	7.8′
C4	2005418641095484160	22:13:45.9 +54:22:15.0	11.59	11.94	11.07	9.1′
C5	2005415617455240448	22:14:45.7 +54:20:49.5	11.59	11.83	11.19	9.2′

Comparison stars are within about 1 mag of the target in Gaia G, have similar color, no close companion, and no VSX entry within 10 arcsec. Images: DSS2 red (POSS-II, STScI Digitized Sky Survey). Stars: ESA Gaia DR3.

VSX

Already in VSX as a 35-minute variable. A draft revision with the 12.5-day eclipses was saved on 15 October 2026. The public entry is still the 35-minute period. The draft says the contamination ratio is 0.31 and no centroid test was done.

Next two eclipses

Eclipse 19 Nov 2026, 18:08 UTC · 9 Nov, 10:08 PST Pacific · 9 Nov, 19:08 CET central Europe
Eclipse 222 Nov 2026, 05:38 UTC · 21 Nov, 21:38 PST Pacific · 22 Nov, 06:38 CET central Europe

These two times are primaries, good to about 20 minutes. Each lasts about 10 hours from first contact to last. A secondary, about 7.5 percent deep, falls 6.25 days after each primary. The same neighbor warning applies: the aperture may contain more than this star.

Help with a measurement

A ground eclipse tells us the dip is on this star and not on a neighbor in the TESS pixel. Differential photometry is the right tool. Pick a date if you can try.

The note

Twelve-day eclipses of TIC 330247030 (PDF)

These pages use the public TESS Quick-Look Pipeline and catalog positions. A prediction is not a confirmation. If you observe, write down which star was in the aperture.