TIC 423005430

Transit candidateRare, 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 J062432.23+572356.4 (EA, 46" away) has the same period - its light leaks into TESS's big pixels; same period as the known variable ASASSN-V J062432.23+572356.4. The rare-find check confirms what is on record - still nice, but not a new discovery.

Microlensing (rogue planet?) hint
A one-off, symmetric brightening at BTJD 2955.19 that fits the gravitational-lens shape better than a flare (Einstein time 56.3 h). This length points to a star or brown dwarf as the lens. Very rare in TESS data; scattered light and asteroids can mimic it.
Transit timing (TTV) significant
The transits arrive early or late by 26.3 min (typical error 1.9 min) repeating every ~2.0 orbits: something is tugging on the planet - another planet, or a moon.
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 (4)

Exocomet-shaped dip · Habitable zone & size · Changing transit depth · Lopsided transit

Checked 2026-10-11 16:35 on NVIDIA GeForce RTX 4070, using every TESS sector of this star. All results (.json)

Notes

Probably noise or an instrument effect. Rare, already known: Microlensing (rogue planet?); Transit timing (TTV); Transits of a giant star (the catalogued variable ASASSN-V J062432.23+572356.4 (EA, 46" away) has the same period - its light leaks into TESS's big pixels; same period as the known variable ASASSN-V J062432.23+572356.4). WARNING: same period as the known variable ASASSN-V J062432.23+572356.4 46" away; the signal is probably its light leaking in. Found automatically by hunt.py in TESS sector 20 (flagged in 1 sector(s)). Detection score 203.7. 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: 2026-10-11 Planet check: Probably noise or an instrument effect 2026-10-11 Rare-find check: Transit timing (TTV); Microlensing (rogue planet?); Transits of a giant star 2026-10-11 Found by the automatic search in TESS sector 20

The signal

Type	Transit candidate
Status	Rare, already known
Period (days)	0.755619
Period source	hunt.py on TESS QLP sector 20
Eclipse / dip depth	4.7%
Amplitude	6.0%
Data used	TESS sector 20 (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	~111.4 Earth radii (~9.94 Jupiter) - too big for a planet

The star (Gaia & TESS)

Distance (pc)	2,517 (~8,208 light years)
Temperature (Gaia)	5,813 K
Size (Gaia)	5.22 x the Sun
Mass (Gaia)	2.13 x the Sun
Luminosity (Gaia)	27.99 x the Sun
Colour, Gaia BP-RP	1.13
RUWE (Gaia)	1.08 - fits a single star
Gaia G mag	13.73
TESS mag	13.15

Names & neighbours

TIC ID	423005430
Gaia DR3 ID	998532479882320768
SIMBAD name	not in SIMBAD
Nearest known variable	ASASSN-V J062432.23+572356.4 (EA, P = 1.511 d), 46" away (same period!)
RA (deg)	96.1347
Dec (deg)	57.4117
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)