TIC 422106434

TYC 3986-02206-1 · Gaia DR3 2005947815437527808 · 2MASS J22225190+5536497

Position: 22h 22m 51.91s, +55° 36′ 49.7″
V magnitude: 9.96
Where: 67 arcmin northeast of V345 Lac, in the 1.2° ring
Signal: EA, primary and secondary, 9.53 days. Primary about 0.41 mag, down to 68 percent of the light. Secondary about 0.16 mag, at phase 0.523.

What TESS shows

Sixteen deep minima in sectors 16, 17, 56, 57, 83, and 84 give

Min I = BTJD 1742.8501 + 9.533613 E

The deep minimum falls to 68 percent of the normal light, 0.41 mag. The part below 80 percent lasts about 2.1 hours, and the whole fade, from 98 percent back to 98 percent, lasts about 4.4 hours. A shallower minimum, 0.16 mag, falls at phase 0.523, which is 4.98 days later, about five hours past the halfway point. The sixteen times scatter by 4.8 minutes rms. The worst residual is 12 minutes.

The star is a solar-type dwarf at about 138 parsecs, G = 9.80, with a Gaia parallax of 7.23 mas. Neighbors contribute only 6.5 percent of its light in the TESS catalog aperture, and the eclipse is 32 percent deep, so the missing light is this star’s. The centroid barely moves. A star 103 arcsec away, TIC 422106556, fades about 5 percent at the same times. That is this eclipse, diluted. Stars elsewhere in the field stay at full light. The note is saved as a VSX draft and is not in the public index.

The light curves

Six TESS sectors. Red ticks are the deep minima. Blue ticks are the shallow minima.

One deep minimum and one shallow minimum in sector 83. Blue points are a star 103 arcsec away, fading by about 5 percent at the same time.

All six sectors folded on the 9.53361-day period. The deep minimum is at phase 0. The shallow minimum is at phase 0.523.

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 2005947815437527808, G = 9.80). 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	2005944516902670336	22:22:57.3 +55:33:13.1	9.34	9.47	9.10	3.7′
C2	2005971180064658560	22:23:17.4 +55:38:02.2	10.21	10.35	9.94	3.8′
C3	2005947918500454656	22:22:06.4 +55:33:04.7	10.77	10.88	10.54	7.4′
C4	2005972073413363968	22:23:28.8 +55:42:42.4	10.23	10.38	9.95	7.9′
C5	2005973207284955392	22:23:43.3 +55:42:00.9	9.86	10.05	9.51	8.9′

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

A VSX draft was saved on 15 October 2026. The star is not in the public index, and Gaia does not list it as a variable. The draft waits while TIC 330739083 is the one star in review.

Next two eclipses

Eclipse 1Primary minimum, the deep one. 1 Nov 2026, 00:33 UTC · 31 Oct, 17:33 PDT Pacific · 1 Nov, 01:33 CET central Europe
Eclipse 2Secondary minimum, the shallower one. 6 Nov 2026, 00:08 UTC · 5 Nov, 16:08 PST Pacific · 6 Nov, 01:08 CET central Europe

The deep minimum is 0.41 mag and lasts about four hours. The shallower one, 0.16 mag, follows 4.98 days later. These times are the TESS fit. The largest residual in the sixteen deep minima is 12 minutes. They have not been checked from the ground. Keep the star 22 arcsec away out of the aperture. It is five magnitudes fainter and is not the eclipsing 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

A 9.53-day eclipsing binary: TIC 422106434 (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.