TIC 377190164

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: in SIMBAD as UCAC4 744-055865 (*); the catalogued variable RX Dra (EA/DM, 49" away) has the same period - its light leaks into TESS's big pixels; same period as the known variable RX Dra. 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 0.192 instead of 0.5: the orbit is stretched (eccentricity at least 0.484). Eccentric binaries show how tides shape orbits, and their slowly turning orbits test General Relativity.

Checked, nothing found (7)

Microlensing (rogue planet?) · 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 2026-10-11 19:45 on NVIDIA GeForce RTX 4070, using every TESS sector of this star. All results (.json)

Notes

Notable, already known: Eccentric eclipsing binary (in SIMBAD as UCAC4 744-055865 (*); the catalogued variable RX Dra (EA/DM, 49" away) has the same period - its light leaks into TESS's big pixels). WARNING: same period as the known variable RX Dra 49" away; the signal is probably its light leaking in. Found automatically by hunt.py in TESS sector 22 (flagged in 12 sector(s)). Detection score 1320.0. 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 2026-10-09 Gaia hints at a hidden companion star (RUWE 1.5) 2026-10-09 Found by the automatic search in TESS sector 14

The signal

Type	Eclipsing binary
Status	Notable, already known
Period (days)	3.78603
Period source	hunt.py on TESS QLP sector 22
Eclipse / dip depth	54.5%
Amplitude	5.7%
Data used	TESS sector 22 (QLP)

The star (Gaia & TESS)

Distance (pc)	1,043 (~3,403 light years)
Temperature (Gaia)	5,307 K
Size (Gaia)	1.97 x the Sun
Mass (Gaia)	1.07 x the Sun
Luminosity (Gaia)	2.80 x the Sun
Colour, Gaia BP-RP	0.95
RUWE (Gaia)	1.54 - hints at a hidden companion star
Gaia G mag	13.63
TESS mag	13.14

Names & neighbours

TIC ID	377190164
Gaia DR3 ID	2155190129296591872
SIMBAD name	UCAC4 744-055865 [*]
Nearest known variable	RX Dra (EA/DM, P = 3.7864 d), 49" away (same period!)
RA (deg)	285.701
Dec (deg)	58.7347
Look it up	SIMBAD · VSX · ESASky · ExoFOP

Record

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