TIC 265274458

Eclipsing binaryRare, 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: in SIMBAD as TYC 4491-165-1 (*); catalogued variable star nearby: ZTF J235122.73+730831.1 (EW, P = 0.36386 d), 166" away; in the TESS eclipsing-binary catalogue (Prsa et al. 2022) as TIC 0265274458. The rare-find check confirms what is on record - still nice, but not a new discovery.

Irregular deep dimming significant
10 deep dips at irregular times, depths from 1.0% to 14.7%. Not periodic and not a young star - like Boyajian's star ('Tabby's star'), one of the strangest stars known.
Eccentric eclipsing binary notable
The second eclipse comes at phase 0.200 instead of 0.5: the orbit is stretched (eccentricity at least 0.471). Eccentric binaries show how tides shape orbits, and their slowly turning orbits test General Relativity.

Checked, nothing found (8)

Microlensing (rogue planet?) · Superflare · Exocomet-shaped dip · Eclipse timing (third body?) · Eclipses changing depth · Pulsating star in an eclipsing binary · Extra dips outside the eclipses · Type of star

Checked 2026-10-12 20:05 on NVIDIA GeForce RTX 4070, using every TESS sector of this star. All results (.json)

Notes

Rare, already known: Irregular deep dimming; Eccentric eclipsing binary (in SIMBAD as TYC 4491-165-1 (*); catalogued variable star nearby: ZTF J235122.73+730831.1 (EW, P = 0.36386 d), 166" away). Found automatically by hunt.py in TESS sector 24 (flagged in 1 sector(s)). Detection score 371.7. 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: 2026-10-12 Rare-find check: Irregular deep dimming; Eccentric eclipsing binary 2026-10-11 Found by the automatic search in TESS sector 24

The signal

Type	Eclipsing binary
Status	Rare, already known
Period (days)	2.99893
Period source	hunt.py on TESS QLP sector 24
Eclipse / dip depth	5.7%
Amplitude	2.4%
Data used	TESS sector 24 (QLP)

The star (Gaia & TESS)

Distance (pc)	828 (~2,700 light years)
Temperature (Gaia)	9,091 K
Size (Gaia)	1.95 x the Sun
Mass (Gaia)	2.13 x the Sun
Luminosity (Gaia)	24.99 x the Sun
Colour, Gaia BP-RP	0.80
RUWE (Gaia)	1.16 - fits a single star
Radial velocity (Gaia)	speed changes by 125 km/s - likely an orbiting pair
Gaia G mag	12.42
TESS mag	12.03

Names & neighbours

TIC ID	265274458
Gaia DR3 ID	2228101077501418240
SIMBAD name	TYC 4491-165-1 [*]
Nearest known variable	ZTF J235122.73+730831.1 (EW, P = 0.36386 d), 166" away
RA (deg)	357.694
Dec (deg)	73.1567
Look it up	SIMBAD · VSX · ESASky · ExoFOP

Record

Found by	hunt.py (automatic)
Date	2026-10-11
Last update	2026-10-12

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

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