TIC 315969204

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: the catalogued variable ASASSN-V J183957.35-375940.0 (EA, 40" away) has the same period - its light leaks into TESS's big pixels; same period as the known variable ASASSN-V J183957.35-375940.0. The rare-find check confirms what is on record - still nice, but not a new discovery.

Eclipse timing (third body?) significant
The eclipses drift early and late by 13.3 min, repeating every ~4 days: light taking longer or shorter to reach us as the pair is pulled around by a hidden third star (or planet), or a slowly turning eccentric orbit.
Transits of a giant star notable
Gaia places this star among the giants: planets transiting giants are rare, and a big star makes even a large planet's dip tiny.

Checked, nothing found (5)

Microlensing (rogue planet?) · Exocomet-shaped dip · Eclipses changing depth · Pulsating star in an eclipsing binary · Extra dips outside the eclipses

Checked 2026-10-12 14:18 on NVIDIA GeForce RTX 4070, using every TESS sector of this star. All results (.json)

Notes

Rare, already known: Eclipse timing (third body?); Transits of a giant star (the catalogued variable ASASSN-V J183957.35-375940.0 (EA, 40" away) has the same period - its light leaks into TESS's big pixels; same period as the known variable ASASSN-V J183957.35-375940.0). WARNING: same period as the known variable ASASSN-V J183957.35-375940.0 40" away; the signal is probably its light leaking in. Found automatically by hunt.py in TESS sector 13 (flagged in 1 sector(s)). Detection score 439.1. 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: Eclipse timing (third body?); Transits of a giant star 2026-10-09 Found by the automatic search in TESS sector 13

The signal

Type	Eclipsing binary
Status	Rare, already known
Period (days)	4.41587
Period source	hunt.py on TESS QLP sector 13
Eclipse / dip depth	68.6%
Amplitude	52.7%
Data used	TESS sector 13 (QLP)

The star (Gaia & TESS)

Distance (pc)	7,888 (~25,729 light years)
Temperature (Gaia)	4,407 K
Size (Gaia)	36.42 x the Sun
Mass (Gaia)	3.71 x the Sun
Luminosity (Gaia)	453.83 x the Sun
Colour, Gaia BP-RP	1.75
RUWE (Gaia)	1.15 - fits a single star
Gaia G mag	14.11
TESS mag	13.28

Names & neighbours

TIC ID	315969204
Gaia DR3 ID	6729980660678332288
SIMBAD name	not in SIMBAD
Nearest known variable	ASASSN-V J183957.35-375940.0 (EA, P = 4.4167 d), 40" away (same period!)
RA (deg)	279.995
Dec (deg)	-37.9845
Look it up	SIMBAD · VSX · ESASky · ExoFOP

Record

Found by	hunt.py (automatic)
Date	2026-10-09
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

Download everything (.zip)