TIC 180652891

Transit candidateKnown to NASA (TOI)

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 →

Already known: on NASA's TESS list as TOI 1857.01 (APC); in SIMBAD as TOI-1857.01 (err); catalogued variable star nearby: Gaia DR3 1474372117059924992 (ROT), 213" away; SIMBAD lists TOI-1857.01 also as TOI-1857.01. The rare-find check confirms what is on record - still nice, but not a new discovery.

Ultra-short-period planet notable
One orbit takes 18.6 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 (10)

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

Checked 2026-10-11 17:11 on NVIDIA GeForce RTX 4070, using every TESS sector of this star. All results (.json)

Notes

Already known to NASA: TOI 1857.01 (APC). Notable, already known: Ultra-short-period planet (on NASA's TESS list as TOI 1857.01 (APC); in SIMBAD as TOI-1857.01 (err)). Already on NASA's TESS list as TOI 1857.01 (APC). Found automatically by hunt.py in TESS sector 23 (flagged in 1 sector(s)). Detection score 48.7. 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 Rare-find check: Ultra-short-period planet 2026-10-11 Found on NASA's list of TESS planet candidates: TOI 1857.01 (APC) 2026-10-11 Planet check: Already known to NASA: TOI 1857.01 (APC) 2026-10-11 Found by the automatic search in TESS sector 23

The signal

Type	Transit candidate
Status	Known to NASA (TOI)
Period (days)	0.776021
Period source	hunt.py on TESS QLP sector 23
Eclipse / dip depth	0.1%
Amplitude	0.1%
Data used	TESS sector 23 (QLP)

Planet check

Verdict	Already known to NASA: TOI 1857.01 (APC) ExoFOP check plot all test results light curve data
Size if it's a planet	~9.6 Earth radii (~0.85 Jupiter)

The star (Gaia & TESS)

Distance (pc)	315 (~1,027 light years)
Temperature (Gaia)	7,091 K
Size (Gaia)	2.30 x the Sun
Mass (Gaia)	1.71 x the Sun
Luminosity (Gaia)	12.02 x the Sun
Colour, Gaia BP-RP	0.42
RUWE (Gaia)	1.27 - fits a single star
Gaia G mag	9.47
TESS mag	9.243

Names & neighbours

TIC ID	180652891
Gaia DR3 ID	1474373972485771520
SIMBAD name	TOI-1857.01 [err]
Nearest known variable	Gaia DR3 1474372117059924992 (ROT), 213" away
RA (deg)	199.607
Dec (deg)	35.954
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)