# List of stars that have unusual dimming periods

This list contain stars that had periods when their apparent magnitude dropped in a way that is not typical of any class of variable stars. Most of these dimming events happened due to an occultation by a dust cloud or dust disk, but many remain without explanaion.

## List

| Star designation | Stellar class | Magnitude | Magnitude | Right ascension (J2000) | Declination (J2000) | Distance (light-years) | Reason for dimming |
| Star designation | Stellar class | Apparent | Absolute | Right ascension (J2000) | Declination (J2000) | Distance (light-years) | Reason for dimming |
| ASASSN-V J193622.23+115244.1 | — | 14.0–15.5 | — | 19$^h$ 36$^m$ 22.23$^s$ | +11° 52′ 44.1″ | 6592 | Unknown |
| ASASSN-V J213939.3-702817.4 | F0V | 12.95–14.22 | 2.5 | 21$^h$ 39$^m$ 39.3$^s$ | −70° 28′ 17.4″ | 3630 | Unknown |
| Betelgeuse | M1-2 | +0.50 | — | 05$^h$ 55$^m$ 10.30536$^s$ | +07° 24′ 25.4304″ | — | "large-grain circumstellar dust" |
| EPIC 204278916 | M1 | 13.7 | — | 16$^h$ 02$^m$ 07.576$^s$ | −22° 57′ 46.89″ | — | Dust disk |
| EPIC 204376071 | M | — | — | 16$^h$ 04$^m$ 10.1267$^s$ | −22° 34′ 45.5503″ | 440 | Possibly giant planet or brown dwarf with rings |
| HD 139139 (EPIC 249706694) | G3/5V | 9.84; 9.677 | — | 15$^h$ 37$^m$ 06.215$^s$ | −19° 08′ 32.96″ | 350 572 | Unknown. It is possible that it didn't had a dimming event at all, and the observed dimmings were due to instrumental errors. |
| KH 15D | K7 | 15.5–21.5 | 6.226 | 06$^h$ 41$^m$ 10.31$^s$ | +09° 28′ 33.2″ | 773 | Possibly circumbinary disk |
| KIC 4150611 (HD 181469) | Pulsator/K/M/G | — | — | 19$^h$ 18$^m$ 58.21759$^s$ | +39° 16′ 01.7913″ | — | Five-star system |
| PDS 110 | keF6 IVeb | 10.422 | 2.54 | 05$^h$ 23$^m$ 31.008$^s$ | –01° 04′ 23.68″ | 1090 | Possibly eclipses by circumstellar dust |
| RW Cephei | K2 0-Ia | 6.0–7.6 | — | 22$^h$ 23$^m$ 07.01521$^s$ | +55° 57′ 47.6244″ | 11,000 | Great dimming event similar to Betelgeuse |
| RZ Piscium | K0 IV | 11.29–13.82 | — | 01$^h$ 09$^m$ 42.056$^s$ | +27° 57′ 1.95″ | 550 | Substantial mass of gas and dust, possibly from disrupted planet |
| Tabby's Star (KIC 8462852) | F3V | 11.705 | 3.08 | 20$^h$ 06$^m$ 15.4527$^s$ | +44° 27′ 24.791″ | 1470 | Unknown |
| TIC 400799224 | — | — | — | — | — | — | "probably from an orbiting body that periodically emits clouds of dust that occult the star" |
| V1400 Centauri | K5 IV(e) Li | 12.31 | — | 14$^h$ 07$^m$ 47.93$^s$ | −39° 45′ 42.7″ | 434 | Eclipse by a free-floating brown dwarf or rogue planet with a circumstellar disk or ring system |
| VVV-WIT-07 | — | 14.35–16.164 | — | 17$^h$ 26$^m$ 29.387$^s$ | −35° 40′ 6.20″ | 23000/? | Unknown |
| WD 1145+017 (EPIC 201563164) | DB | 17.0 | — | 11$^h$ 48$^m$ 33.63$^s$ | +01° 28′ 59.4″ | 570 | Dust disk |
| ZTF J0139+5245 (ZTF J013906.17+524536.89) | DA | 18.4 | — | 01$^h$ 39$^m$ 06.17$^s$ | +52° 45′ 36.89″ | 564 | Dust disk |
| Gaia17bpp | M0-III | 16.13–20.48 | — | 19$^h$ 37$^m$ 23.16$^s$ | +17° 59′ 02.90″ | 27,600 | Dust disk |
| Gaia21bcv | K4.5V | 17.70–20.12 | 3.2 | 07$^h$ 14$^m$ 33.276$^s$ | −12° 13′ 27.34″ | 4,508 | Eclipse by a substellar companion with a 0.5 AU-radius debris disk |
| ASASSN-21js | B | 12.8 | 1.38 | 11$^h$ 47$^m$ 11.754$^s$ | −62° 10′ 36.80″ | 9,149 | Eclipse by a distant substellar companion with a 1.05 AU-radius debris disk |