TIC 421781407

TESS eclipses near V345 Lac

TYC 3986-01792-1 · Gaia DR3 2006021413999028864 · 2MASS J22190273+5550050

Position
22h 19m 02.74s, +55° 50′ 05.0″
V magnitude
12.21
Where
70 arcmin north of V345 Lac, in the 1.2° ring
Signal
The dip is KV Cep, 60 arcsec away. KV Cep falls to about 60 percent of its light. This star’s aperture falls to about 94 percent at the same times.

What TESS shows

The dip in this aperture repeats on the period of KV Cep, which is TIC 421927598, 60 arcsec away. VSX already lists KV Cep as an eclipsing binary, period 0.85883 days. A fit to the QLP minima of that star gives

Min (KV Cep) = BTJD 2858.4545 + 0.85884 E

KV Cep falls to 60 percent of its light. At the same times this star’s aperture falls to 94 percent. A second minimum of KV Cep, near phase 0.5, is diluted the same way. About 15 percent of the light in this aperture is KV Cep, which matches a contamination ratio of 0.29. No period is proposed for TIC 421781407, and no eclipse of this star is predicted. The note is not a VSX submission, and it does not revise KV Cep.

The light curves

TIC 421781407. The ticks are KV Cep’s minima.
TIC 421781407. The ticks are KV Cep’s minima.
One minimum. Blue is KV Cep, 60 arcsec away. Black is TIC 421781407.
One minimum. Blue is KV Cep, 60 arcsec away. Black is TIC 421781407.
Both stars folded on KV Cep’s 0.85884-day period. The deep eclipse is KV Cep.
Both stars folded on KV Cep’s 0.85884-day period. The deep eclipse is KV Cep.

Finder chart

No finder chart for this star. Its dip belongs to another star, so there is nothing here to observe.

VSX

Not filed. KV Cep, TIC 421927598, is already in VSX as an eclipsing binary with a period of 0.85883 days. The TESS period on that star is 0.85884 days.

Next date

There is no date for this star. The fade in the TESS aperture is KV Cep, 60 arcsec away, and KV Cep is already in VSX.

Help with a measurement

There is no eclipse of this star to sign up for. The fade is KV Cep, already in the variable-star catalog, 60 arcsec away.

Your email is only for arranging the observation. It is not posted on this site.

The note

The dip on TIC 421781407 is KV Cep (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.