TIC 421379346

Transit candidateRare, already known

Rare & notable finds

Something genuinely unusual turned up. Treat it as a lead: every one of these has ordinary explanations too, listed with each. How these checks work →

Already known: the catalogued variable WISE J204518.8+551044 (EA, 38" away) has the same period - its light leaks into TESS's big pixels; same period as the known variable WISE J204518.8+551044. The rare-find check confirms what is on record - still nice, but not a new discovery.

Transit timing (TTV) significant
The transits arrive early or late by 15.7 min (typical error 3.7 min) repeating every ~2.0 orbits: something is tugging on the planet - another planet, or a moon.
Transits of a giant star notable
Gaia places this star among the giants: planets transiting giants are rare, and a big star makes even a large planet's dip tiny.

Checked, nothing found (6)

Microlensing (rogue planet?) · Exocomet-shaped dip · Habitable zone & size · Transit duration (TDV) · Changing transit depth · Lopsided transit

Checked 2026-10-11 16:40 on NVIDIA GeForce RTX 4070, using every TESS sector of this star. All results (.json)

Notes

Probably noise or an instrument effect. Rare, already known: Transit timing (TTV); Transits of a giant star (the catalogued variable WISE J204518.8+551044 (EA, 38" away) has the same period - its light leaks into TESS's big pixels; same period as the known variable WISE J204518.8+551044). WARNING: same period as the known variable WISE J204518.8+551044 38" away; the signal is probably its light leaking in. Found automatically by hunt.py in TESS sector 16 (flagged in 2 sector(s)). Detection score 178.6. Not in VSX, ASAS-SN or ZTF variable catalogues at the time of the search; not in Gaia DR3's variable lists. Unchecked by hand yet: verify the period, nearby stars and a wider catalogue search. Updates: 2026-10-11 Planet check: Probably noise or an instrument effect 2026-10-11 Rare-find check: Transit timing (TTV); Transits of a giant star 2026-10-11 Gaia hints at a hidden companion star (RUWE 3.1) 2026-10-11 Found by the automatic search in TESS sector 16

The signal

Type	Transit candidate
Status	Rare, already known
Period (days)	1.05063
Period source	hunt.py on TESS QLP sector 16
Eclipse / dip depth	1.1%
Amplitude	1.5%
Data used	TESS sector 16 (QLP)

Planet check

Verdict	Probably noise or an instrument effect ExoFOP check plot all test results light curve data
Size if it's a planet	~89.5 Earth radii (~7.99 Jupiter) - too big for a planet

The star (Gaia & TESS)

Distance (pc)	1,295 (~4,223 light years)
Temperature (Gaia)	4,633 K
Size (Gaia)	8.64 x the Sun
Mass (Gaia)	2.70 x the Sun
Luminosity (Gaia)	31.07 x the Sun
Colour, Gaia BP-RP	1.53
RUWE (Gaia)	3.13 - hints at a hidden companion star
Gaia G mag	12.31
TESS mag	11.53

Names & neighbours

TIC ID	421379346
Gaia DR3 ID	2183743342462933504
SIMBAD name	not in SIMBAD
Nearest known variable	WISE J204518.8+551044 (EA, P = 2.1 d), 38" away (same period!)
RA (deg)	311.338
Dec (deg)	55.1701
Look it up	SIMBAD · VSX · ESASky · ExoFOP

Record

Found by	hunt.py (automatic)
Date	2026-10-11
Last update	2026-10-11

Where it sits among the stars

ESA Gaia colour and true brightness. Grey: every Star Log candidate. Orange: this star.

How to read this diagram →

Data files

Download everything (.zip)