TIC 256514921

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: catalogued variable star nearby: Gaia DR3 2241257288180680448 (ROT), 200" away. 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 33.9 min (typical error 2.0 min) repeating every ~2.0 orbits: something is tugging on the planet - another planet, or a moon.
Lopsided transit hint
The start of the transit is deeper than the end: a dust tail (disintegrating planet), rings, a fast-spinning star, or a blend.
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 (9)

Microlensing (rogue planet?) · Exocomet-shaped dip · Habitable zone & size · Transit duration (TDV) · Changing transit depth · Dimming beside the transit · Trojan companions (L4/L5) · More planets in the system · Self-lensing binary

Checked 2026-10-11 17:00 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); Lopsided transit; Transits of a giant star (catalogued variable star nearby: Gaia DR3 2241257288180680448 (ROT), 200" away). Found automatically by hunt.py in TESS sector 21 (flagged in 8 sector(s)). Detection score 90.2. 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); Lopsided transit; Transits of a giant star 2026-10-11 Found by the automatic search in TESS sector 21

The signal

Type	Transit candidate
Status	Rare, already known
Period (days)	2.66544
Period source	hunt.py on TESS QLP sector 21
Eclipse / dip depth	1.1%
Amplitude	0.4%
Data used	TESS sector 21 (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	~101.1 Earth radii (~9.02 Jupiter) - too big for a planet

The star (Gaia & TESS)

Distance (pc)	1,683 (~5,488 light years)
Colour, Gaia BP-RP	1.35
RUWE (Gaia)	1.01 - fits a single star
Gaia G mag	12.20
TESS mag	11.52

Names & neighbours

TIC ID	256514921
Gaia DR3 ID	2241257666137849344
SIMBAD name	not in SIMBAD
Nearest known variable	Gaia DR3 2241257288180680448 (ROT), 200" away
RA (deg)	299.393
Dec (deg)	63.1542
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)