TIC 166656358

Transit candidateNotable find

Rare & notable finds

A notable find: not unheard of, but the kind of system astronomers are glad to have more of. 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 16.6 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).

Checked, nothing found (8)

Microlensing (rogue planet?) · Exocomet-shaped dip · Habitable zone & size · Transit timing (TTV) · Lopsided transit · Dimming beside the transit · Trojan companions (L4/L5) · Type of star

Checked 2026-10-11 16:57 on NVIDIA GeForce RTX 4070, using every TESS sector of this star. All results (.json)

Notes

Probably noise or an instrument effect. Notable: Ultra-short-period planet. See the Rare & notable finds section. Found automatically by hunt.py in TESS sector 22 (flagged in 1 sector(s)). Detection score 88.4. 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: Ultra-short-period planet 2026-10-11 Found by the automatic search in TESS sector 22

The signal

Type	Transit candidate
Status	Notable find
Period (days)	0.691586
Period source	hunt.py on TESS QLP sector 22
Eclipse / dip depth	2.4%
Amplitude	1.5%
Data used	TESS sector 22 (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	~16.6 Earth radii (~1.48 Jupiter)

The star (Gaia & TESS)

Distance (pc)	518 (~1,691 light years)
Temperature (Gaia)	5,547 K
Size (Gaia)	1.05 x the Sun
Mass (Gaia)	0.89 x the Sun
Luminosity (Gaia)	0.94 x the Sun
Colour, Gaia BP-RP	0.84
RUWE (Gaia)	1.29 - fits a single star
Gaia G mag	13.30
TESS mag	12.87

Names & neighbours

TIC ID	166656358
Gaia DR3 ID	761354975522902656
SIMBAD name	not in SIMBAD
Nearest known variable	none within 5'
RA (deg)	166.6
Dec (deg)	34.2764
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)