TIC 27243217

Eclipsing binaryNotable, already known

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: the catalogued variable V1098 Per (EA, 36" away) has the same period - its light leaks into TESS's big pixels; same period as the known variable V1098 Per. The rare-find check confirms what is on record - still nice, but not a new discovery.

Eccentric eclipsing binary notable
The second eclipse comes at phase 0.329 instead of 0.5: the orbit is stretched (eccentricity at least 0.268). Eccentric binaries show how tides shape orbits, and their slowly turning orbits test General Relativity.

Checked, nothing found (6)

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

Checked 2026-10-11 22:40 on NVIDIA GeForce RTX 4070, using every TESS sector of this star. All results (.json)

Notes

Notable, already known: Eccentric eclipsing binary (the catalogued variable V1098 Per (EA, 36" away) has the same period - its light leaks into TESS's big pixels; same period as the known variable V1098 Per). WARNING: same period as the known variable V1098 Per 36" away; the signal is probably its light leaking in. Found automatically by hunt.py in TESS sector 19 (flagged in 1 sector(s)). Detection score 999.9. 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: Eccentric eclipsing binary 2026-10-11 Found by the automatic search in TESS sector 19

The signal

Type	Eclipsing binary
Status	Notable, already known
Period (days)	5.56766
Period source	hunt.py on TESS QLP sector 19
Eclipse / dip depth	62.4%
Amplitude	2.8%
Data used	TESS sector 19 (QLP)

The star (Gaia & TESS)

Distance (pc)	369 (~1,204 light years)
Temperature (Gaia)	5,080 K
Size (Gaia)	0.86 x the Sun
Luminosity (Gaia)	0.45 x the Sun
Colour, Gaia BP-RP	1.21
RUWE (Gaia)	1.02 - fits a single star
Gaia G mag	13.79
TESS mag	13.17

Names & neighbours

TIC ID	27243217
Gaia DR3 ID	257860975939660032
SIMBAD name	not in SIMBAD
Nearest known variable	V1098 Per (EA, P = 2.7845 d), 36" away (same period!)
RA (deg)	65.498
Dec (deg)	47.1589
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)