TIC 219205407
Transit candidateRare, already known
Rare & notable finds
Something unusual, worth a look - less certain than a significant find. How these checks work →
Already known: on NASA's TESS list as TOI 946.01 (FP); SIMBAD lists TOI-946.01 also as TOI-946.01; in SIMBAD as TOI-946.01 (err). The rare-find check confirms what is on record - still nice, but not a new discovery.
- Exocomet-shaped dip hint
A dip at BTJD 2336.42 that drops fast and recovers slowly (0.85% deep) - the shape of a comet's dusty tail passing the star (like Beta Pictoris). - Transit duration (TDV) hint
The transit length changes from one transit to the next beyond the errors - a sign of a wobbling orbit (moon) or a precessing orbit. - Changing transit depth hint
The dip depth changes by 16% between transits - a disintegrating planet trailing dust, starspots, or light from another star mixing in. - 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. - Dimming beside the transit hint
On average the star is 565 ppm dimmer just before and after the transit (17.7 sigma): what a moon (or ring/dust) travelling with the planet would cause. Instrument trends can do this too.
Checked, nothing found (7)
Microlensing (rogue planet?) · Habitable zone & size · Transit timing (TTV) · Trojan companions (L4/L5) · More planets in the system · Self-lensing binary · Type of star
Checked 2026-10-11 16:46 on NVIDIA GeForce RTX 4070, using every TESS sector of this star. All results (.json)
Notes
Already known to NASA: TOI 946.01 (FP).
Rare, already known: Exocomet-shaped dip; Transit duration (TDV); Changing transit depth (on NASA's TESS list as TOI 946.01 (FP); SIMBAD lists TOI-946.01 also as TOI-946.01).
Already on NASA's TESS list as TOI 946.01 (FP).
Found automatically by hunt.py in TESS sector 28 (flagged in 7 sector(s)). Detection score 160.4.
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:
2026-10-12 Rare-find check: Exocomet-shaped dip; Transit duration (TDV); Changing transit depth
2026-10-12 Gaia hints at a hidden companion star (RUWE 3.8)
2026-10-12 Found on NASA's list of TESS planet candidates: TOI 946.01 (FP)
2026-10-12 Planet check: Already known to NASA: TOI 946.01 (FP)
2026-10-12 Found by the automatic search in TESS sector 28
The signal
| Type | Transit candidate |
| Status | Rare, already known |
| Period (days) | 6.12481 |
| Period source | hunt.py on TESS QLP sector 28 |
| Eclipse / dip depth | 3.0% |
| Amplitude | 0.4% |
| Data used | TESS sector 28 (QLP) |
Planet check
| Verdict | Already known to NASA: TOI 946.01 (FP) |
| Size if it's a planet | ~19.8 Earth radii (~1.77 Jupiter) |
The star (Gaia & TESS)
| Distance (pc) | 167 (~544 light years) |
| Temperature (Gaia) | 4,884 K |
| Size (Gaia) | 1.09 x the Sun |
| Mass (Gaia) | 0.84 x the Sun |
| Luminosity (Gaia) | 0.60 x the Sun |
| Colour, Gaia BP-RP | 1.13 |
| RUWE (Gaia) | 3.75 - hints at a hidden companion star |
| Gaia G mag | 11.46 |
| TESS mag | 10.87 |
Names & neighbours
| TIC ID | 219205407 |
| Gaia DR3 ID | 5549740136101187840 |
| SIMBAD name | TOI-946.01 [err] |
| Nearest known variable | none within 5' |
| RA (deg) | 92.834 |
| Dec (deg) | -51.4667 |
| 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.
Data files
- 10_rare_check.png 80 KB
- 5_planet_check.png 92 KB
- TIC219205407_s0028.fits 200 KB
- TIC219205407_s0028.png 56 KB
- lightcurve_all_sectors.csv 1 MB
- planet_check.json 5 KB
- rare_check.json 6 KB
- thumb.png 66 KB
- meta.json
