TIC 165986324

Transit candidateNotable, 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 2MASS J08561700+3230520 (*); the catalogued variable CSS_J085614.5+323016 (EA, 47" away) has the same period - its light leaks into TESS's big pixels; same period as the known variable CSS_J085614.5+323016. The rare-find check confirms what is on record - still nice, but not a new discovery.

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 (7)

Microlensing (rogue planet?) · Exocomet-shaped dip · Habitable zone & size · Transit timing (TTV) · Lopsided transit · More planets in the system · Self-lensing binary

Checked 2026-10-11 16:36 on NVIDIA GeForce RTX 4070, using every TESS sector of this star. All results (.json)

Notes

Probably noise or an instrument effect. Notable, already known: Transits of a giant star (in SIMBAD as 2MASS J08561700+3230520 (*); the catalogued variable CSS_J085614.5+323016 (EA, 47" away) has the same period - its light leaks into TESS's big pixels). WARNING: same period as the known variable CSS_J085614.5+323016 47" away; the signal is probably its light leaking in. Found automatically by hunt.py in TESS sector 21 (flagged in 1 sector(s)). Detection score 202.3. 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 Planet check: Probably noise or an instrument effect 2026-10-11 Rare-find check: Transits of a giant star 2026-10-11 Found by the automatic search in TESS sector 21

The signal

Type	Transit candidate
Status	Notable, already known
Period (days)	0.70122
Period source	hunt.py on TESS QLP sector 21
Eclipse / dip depth	1.6%
Amplitude	2.1%
Data used	TESS sector 21 (QLP)

Planet check

Verdict	Probably noise or an instrument effect ExoFOP check plot all test results light curve data
Size if it's a planet	~105.1 Earth radii (~9.38 Jupiter) - too big for a planet

The star (Gaia & TESS)

Distance (pc)	1,309 (~4,269 light years)
Colour, Gaia BP-RP	1.17
RUWE (Gaia)	1.00 - fits a single star
Gaia G mag	12.07
TESS mag	11.48

Names & neighbours

TIC ID	165986324
Gaia DR3 ID	712860740303888256
SIMBAD name	2MASS J08561700+3230520 [*]
Nearest known variable	CSS_J085614.5+323016 (EA, P = 1.4024 d), 47" away (same period!)
RA (deg)	134.071
Dec (deg)	32.5144
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)