TIC 390631197

Transit candidatePossible rare find

Rare & notable finds

Something unusual, worth a look - less certain than a significant find. How these checks work →

Fully unknown: not in SIMBAD, not in Gaia DR3's variable lists, not on NASA's TOI lists, no catalogued variable star within 5′ (VSX, ASAS-SN, ZTF, ATLAS, WISE, TESS EB catalogues) - this may be new.

Ultra-short-period planet notable
One orbit takes 11.5 hours - ultra-short-period planets are found around only ~0.5% of stars (if the signal is a real planet - it hasn't passed the planet check).
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.
Single transit of another planet notable
Besides the known planet: one transit-like dip at BTJD 3786.99, 14.4 h long and 1.19% deep (~7.2 Earth radii). For a dip this long the orbit must take at least ~1337 days: a cold, long-period planet - rare in TESS data.

Checked, nothing found (9)

Microlensing (rogue planet?) · Superflare · Exocomet-shaped dip · Habitable zone & size · Transit timing (TTV) · Transit duration (TDV) · Changing transit depth · Dimming beside the transit · Type of star

Checked 2026-10-11 16:53 on NVIDIA GeForce RTX 4070, using every TESS sector of this star. All results (.json)

Notes

Probably noise or an instrument effect. Unusual: Ultra-short-period planet; Lopsided transit; Single transit of another planet. See the Rare & notable finds section. Found automatically by hunt.py in TESS sector 23 (flagged in 1 sector(s)). Detection score 98.7. 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: Lopsided transit; Ultra-short-period planet; Single transit of another planet 2026-10-11 Gaia hints at a hidden companion star (RUWE 7.1) 2026-10-11 Found by the automatic search in TESS sector 23

The signal

Type	Transit candidate
Status	Possible rare find
Period (days)	0.477353
Period source	hunt.py on TESS QLP sector 23
Eclipse / dip depth	3.3%
Amplitude	2.8%
Data used	TESS sector 23 (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	~12.0 Earth radii (~1.07 Jupiter)

The star (Gaia & TESS)

Distance (pc)	136 (~444 light years)
Colour, Gaia BP-RP	2.04
RUWE (Gaia)	7.08 - hints at a hidden companion star
Gaia G mag	13.89
TESS mag	12.85

Names & neighbours

TIC ID	390631197
Gaia DR3 ID	3710844463775762560
SIMBAD name	not in SIMBAD
Nearest known variable	none within 5'
RA (deg)	191.023
Dec (deg)	8.62033
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.

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Data files

Download everything (.zip)