TIC 404804908

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: on NASA's TESS list as CTOI 404804908.01 (PC); in the TESS eclipsing-binary catalogue (Prsa et al. 2022) as TIC 0404804908; in SIMBAD as HD 269912B (*), 4.2" away; catalogued variable star nearby: Gaia DR3 4657109047154023808 (BE|GCAS|SDOR|WR), 51" away. The rare-find check confirms what is on record - still nice, but not a new discovery.

Irregular deep dimming significant
4 deep dips at irregular times, depths from 0.8% to 7.5%. Not periodic and not a young star - like Boyajian's star ('Tabby's star'), one of the strangest stars known.
Another planet in the system significant
Another set of dips every 3.2246 days (359 ppm, 43 seen, SNR 18.9). Its period is close to a 5:2 ratio with the known one (orbital resonance).
Self-lensing binary significant
Short brightenings repeat every 3.2246 days (590 ppm, 63 seen): a white dwarf (or other compact star) magnifying its companion each time it passes in front - only a handful known.

Checked, nothing found (10)

Microlensing (rogue planet?) · 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 18:06 on NVIDIA GeForce RTX 4070, using every TESS sector of this star. All results (.json)

Notes

Already known to NASA: CTOI 404804908.01 (PC). Rare, already known: Irregular deep dimming; Another planet in the system; Self-lensing binary (on NASA's TESS list as CTOI 404804908.01 (PC); in the TESS eclipsing-binary catalogue (Prsa et al. 2022) as TIC 0404804908). Already on NASA's TESS list as CTOI 404804908.01 (PC). Found automatically by hunt.py in TESS sector 31 (flagged in 17 sector(s)). Detection score 84.5. 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: 2026-10-12 Rare-find check: Irregular deep dimming; Another planet in the system; Self-lensing binary 2026-10-12 Gaia hints at a hidden companion star (RUWE 3.9) 2026-10-12 Found on NASA's list of TESS planet candidates: CTOI 404804908.01 (PC) 2026-10-12 Planet check: Already known to NASA: CTOI 404804908.01 (PC) 2026-10-12 Found by the automatic search in TESS sector 29

The signal

Type	Transit candidate
Status	Rare, already known
Period (days)	2.20683
Period source	hunt.py on TESS QLP sector 31
Eclipse / dip depth	0.8%
Amplitude	0.4%
Data used	TESS sector 31 (QLP)

Planet check

Verdict	Already known to NASA: CTOI 404804908.01 (PC) ExoFOP check plot all test results light curve data
Size if it's a planet	~9.8 Earth radii (~0.87 Jupiter)

The star (Gaia & TESS)

Distance (pc)	457 (~1,489 light years)
Colour, Gaia BP-RP	0.78
RUWE (Gaia)	3.85 - hints at a hidden companion star
Gaia G mag	12.07
TESS mag	10.87

Names & neighbours

TIC ID	404804908
Gaia DR3 ID	4657085579412104832
SIMBAD name	HD 269912B [*]
Nearest known variable	Gaia DR3 4657109047154023808 (BE\|GCAS\|SDOR\|WR), 51" away
RA (deg)	84.7634
Dec (deg)	-70.9028
Look it up	SIMBAD · VSX · ESASky · ExoFOP

Record

Found by	hunt.py (automatic)
Date	2026-10-12
Last update	2026-10-12

Where it sits among the stars

ESA Gaia colour and true brightness. Grey: every Star Log candidate. Orange: this star.

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Data files

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