TIC 309849507

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: in SIMBAD as UCAC4 700-056432 (*). The rare-find check confirms what is on record - still nice, but not a new discovery.

Microlensing (rogue planet?) significant
A one-off, symmetric brightening at BTJD 3449.15 that fits the gravitational-lens shape better than a flare (Einstein time 9.6 h). Events this short can be made by a free-floating (rogue) planet passing in front of the star. Very rare in TESS data; scattered light and asteroids can mimic it.
Lopsided transit hint
The end of the transit is deeper than the start: a dust tail (disintegrating planet), rings, a fast-spinning star, or a blend.

Checked, nothing found (6)

Exocomet-shaped dip · Habitable zone & size · Transit timing (TTV) · Transit duration (TDV) · Changing transit depth · Type of star

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. Rare, already known: Microlensing (rogue planet?); Lopsided transit (in SIMBAD as UCAC4 700-056432 (*)). Found automatically by hunt.py in TESS sector 16 (flagged in 3 sector(s)). Detection score 203.2. 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: Microlensing (rogue planet?); Lopsided transit 2026-10-11 Gaia hints at a hidden companion star (RUWE 4.6) 2026-10-11 Found by the automatic search in TESS sector 16

The signal

Type	Transit candidate
Status	Rare, already known
Period (days)	0.58732
Period source	hunt.py on TESS QLP sector 16
Eclipse / dip depth	3.5%
Amplitude	3.8%
Data used	TESS sector 16 (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	~26.0 Earth radii (~2.32 Jupiter) - too big for a planet

The star (Gaia & TESS)

Distance (pc)	609 (~1,985 light years)
Temperature (Gaia)	5,183 K
Size (Gaia)	1.50 x the Sun
Luminosity (Gaia)	1.47 x the Sun
Colour, Gaia BP-RP	0.96
RUWE (Gaia)	4.60 - hints at a hidden companion star
Gaia G mag	13.22
TESS mag	12.72

Names & neighbours

TIC ID	309849507
Gaia DR3 ID	1589456590389460096
SIMBAD name	UCAC4 700-056432 [*]
Nearest known variable	none within 5'
RA (deg)	229.255
Dec (deg)	49.8637
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)