TIC 408357344
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: catalogued variable star nearby: Gaia DR3 2203921446722847872 (RS), 56" away. 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 2869.71 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. - Transit timing (TTV) significant
The transits arrive early or late by 5.4 min (typical error 1.1 min) repeating every ~72.1 orbits: something is tugging on the planet - another planet, or a moon.
Checked, nothing found (7)
Exocomet-shaped dip · Habitable zone & size · Transit duration (TDV) · Changing transit depth · Lopsided transit · Dimming beside the transit · Type of star
Checked 2026-10-11 16:42 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) (catalogued variable star nearby: Gaia DR3 2203921446722847872 (RS), 56" away).
Found automatically by hunt.py in TESS sector 24 (flagged in 2 sector(s)). Detection score 170.0.
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?); Transit timing (TTV)
2026-10-11 Gaia hints at a hidden companion star (RUWE 2.2)
2026-10-11 Found by the automatic search in TESS sector 24
The signal
| Type | Transit candidate |
| Status | Rare, already known |
| Period (days) | 1.28316 |
| Period source | hunt.py on TESS QLP sector 24 |
| Eclipse / dip depth | 3.1% |
| Amplitude | 2.6% |
| Data used | TESS sector 24 (QLP) |
Planet check
| Verdict | Probably noise or an instrument effect |
| Size if it's a planet | ~34.5 Earth radii (~3.08 Jupiter) - too big for a planet |
The star (Gaia & TESS)
| Distance (pc) | 543 (~1,770 light years) |
| Temperature (Gaia) | 5,872 K |
| Size (Gaia) | 1.58 x the Sun |
| Mass (Gaia) | 1.09 x the Sun |
| Luminosity (Gaia) | 2.68 x the Sun |
| Colour, Gaia BP-RP | 1.08 |
| RUWE (Gaia) | 2.17 - hints at a hidden companion star |
| Gaia G mag | 12.91 |
| TESS mag | 12.35 |
Names & neighbours
| TIC ID | 408357344 |
| Gaia DR3 ID | 2203921343643633536 |
| SIMBAD name | not in SIMBAD |
| Nearest known variable | Gaia DR3 2203921446722847872 (RS), 56" away |
| RA (deg) | 326.719 |
| Dec (deg) | 61.4735 |
| 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.
Data files
- 10_rare_check.png 61 KB
- 5_planet_check.png 125 KB
- TIC408357344_s0024.fits 76 KB
- TIC408357344_s0024.png 48 KB
- lightcurve_all_sectors.csv 3 MB
- planet_check.json 4 KB
- rare_check.json 7 KB
- thumb.png 57 KB
- meta.json
