TIC 137881251

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 ATO J150.5647+55.7832 (*); catalogued variable star nearby: Gaia DR3 1044973862469242496 (DSCT|GDOR|SXPHE), 226" away; in the ATLAS variable-star catalogue (Heinze et al. 2018) as J150.5647+55.7832; SIMBAD lists ATO J150.5647+55.7832 also as ATO J150.5647+55.7832. 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 2627.46 that fits the gravitational-lens shape better than a flare (Einstein time 0.7 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.

Checked, nothing found (9)

Exocomet-shaped dip · Habitable zone & size · Transit timing (TTV) · Transit duration (TDV) · Changing transit depth · Lopsided transit · Dimming beside the transit · Trojan companions (L4/L5) · Type of star

Checked 2026-10-11 16:47 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?) (in SIMBAD as ATO J150.5647+55.7832 (*); catalogued variable star nearby: Gaia DR3 1044973862469242496 (DSCT|GDOR|SXPHE), 226" away). Found automatically by hunt.py in TESS sector 21 (flagged in 1 sector(s)). Detection score 133.7. 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: Microlensing (rogue planet?) 2026-10-11 Found by the automatic search in TESS sector 21

The signal

Type	Transit candidate
Status	Rare, already known
Period (days)	5.43738
Period source	hunt.py on TESS QLP sector 21
Eclipse / dip depth	2.8%
Amplitude	0.4%
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	~21.6 Earth radii (~1.92 Jupiter)

The star (Gaia & TESS)

Distance (pc)	445 (~1,452 light years)
Temperature (Gaia)	5,647 K
Size (Gaia)	1.26 x the Sun
Mass (Gaia)	0.94 x the Sun
Luminosity (Gaia)	1.45 x the Sun
Colour, Gaia BP-RP	0.84
RUWE (Gaia)	0.98 - fits a single star
Radial velocity (Gaia)	speed changes by 61 km/s - likely an orbiting pair
Gaia G mag	12.52
TESS mag	12.08

Names & neighbours

TIC ID	137881251
Gaia DR3 ID	1044974961980864128
SIMBAD name	ATO J150.5647+55.7832 [*]
Nearest known variable	Gaia DR3 1044973862469242496 (DSCT\|GDOR\|SXPHE), 226" away
RA (deg)	150.565
Dec (deg)	55.7833
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)