TIC 258354968

Transit candidateRare, already known

Rare & notable finds

Something unusual, worth a look - less certain than a significant find. How these checks work →

Already known: in SIMBAD as TYC 4243-533-1 (*); catalogued variable star nearby: Gaia DR3 2249070623965131648 (ROT), 200" away. The rare-find check confirms what is on record - still nice, but not a new discovery.

Lopsided transit hint
The start of the transit is deeper than the end: a dust tail (disintegrating planet), rings, a fast-spinning star, or a blend.
Another planet in the system hint
Another set of dips every 24.9000 days (449 ppm, 4 seen, SNR 9.2).

Checked, nothing found (9)

Microlensing (rogue planet?) · Exocomet-shaped dip · Habitable zone & size · Transit timing (TTV) · Transit duration (TDV) · Changing transit depth · Dimming beside the transit · Self-lensing binary · Type of star

Checked 2026-10-11 16:25 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: Lopsided transit; Another planet in the system (in SIMBAD as TYC 4243-533-1 (*); catalogued variable star nearby: Gaia DR3 2249070623965131648 (ROT), 200" away). Found automatically by hunt.py in TESS sector 21 (flagged in 9 sector(s)). Detection score 482.4. 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: Lopsided transit; Another planet in the system 2026-10-11 Planet check: Probably noise or an instrument effect 2026-10-09 Gaia hints at a hidden companion star (RUWE 6.0) 2026-10-09 Found by the automatic search in TESS sector 14

The signal

Type	Transit candidate
Status	Rare, already known
Period (days)	1.66003
Period source	hunt.py on TESS QLP sector 21
Eclipse / dip depth	2.5%
Amplitude	1.6%
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	~49.7 Earth radii (~4.43 Jupiter) - too big for a planet

The star (Gaia & TESS)

Distance (pc)	587 (~1,914 light years)
Colour, Gaia BP-RP	0.60
RUWE (Gaia)	5.95 - hints at a hidden companion star
Gaia G mag	10.85
TESS mag	10.53

Names & neighbours

TIC ID	258354968
Gaia DR3 ID	2249064198694027904
SIMBAD name	TYC 4243-533-1 [*]
Nearest known variable	Gaia DR3 2249070623965131648 (ROT), 200" away
RA (deg)	296.858
Dec (deg)	67.1814
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)