List of stars that have unusual dimming periods explained

This list of stars that have unusual dimming periods is a table of stars that have been observed to darken and brighten and do not appear to be eclipsing binaries or intrinsic variables. It is based on studies searching for analogs of Tabby's Star.^{[1] [2]}

The listing here is ordered alphabetically.__TOC__

List

Star designation	Stellar class	Magnitude		Right ascension (J2000)	Declination (J2000)	Distance (light-years)	Reason for dimming
		Apparent	Absolute
ASASSN-V J193622.23+115244.1	-	14.0–15.5	-			6592	Unknown
ASASSN-V J213939.3-702817.4	F0V	12.95–14.22	2.5			3630	Unknown
Betelgeuse	M1-2^[3]	+0.50^[4]	-	^[5]		-	"large-grain circumstellar dust"^[6] ^[7]
EPIC 204278916	M1	13.7	-			-	Dust disk
EPIC 204376071	M	-	-			440	Possibly giant planet or brown dwarf with rings
HD 139139 (EPIC 249706694)	G3/5V	9.84; 9.677	-			350 175.5order=flipNaNorder=flip	Unknown
KH 15D	K7	15.5–21.5	6.226			773	Possibly circumbinary disk
KIC 4150611 (HD 181469)	Pulsator/K/M/G	-	-	^[8]		-	Five-star system
PDS 110	keF6 IVeb	10.422	2.54			1090	Possibly eclipses by circumstellar dust^[9]
RW Cephei	K2 0-Ia^[10]	6.0–7.6^[11]	-			3400pc^[12]	Great dimming event similar to Betelgeuse
RZ Piscium	K0 IV	11.29–13.82	-			550	Substantial mass of gas and dust, possibly from disrupted planet
Tabby's Star (KIC 8462852)	F3V	11.705	3.08			1470	Unknown
TIC 400799224	-	-	-	-	-	-	"probably from an orbiting body that periodically emits clouds of dust that occult the star"^[13] ^[14]
V1400 Centauri	K5 IV(e) Li	12.31	-			434	Eclipse by a free-floating brown dwarf or rogue planet with a circumstellar disk or ring system^[15]
VVV-WIT-07	-	14.35–16.164	-			23000/?	Unknown
VVV-WIT-08	-	-	-	-	-	-	Probably a black hole companion or a free-floating brown dwarf with a circumstellar disk
WD 1145+017 (EPIC 201563164)	DB	17.0	-			570	Dust disk
ZTF J0139+5245 (ZTF J013906.17+524536.89)	DA	18.4	-			564	Dust disk
Gaia17bpp	M0-III	16.13–20.48^[16]	-			27,600^[17]	Dust disk
Gaia21bcv	K4.5V	17.70–20.12	3.2			4,508	Eclipse by a substellar companion with a 0.5 AU-radius debris disk
ASASSN-21js	B	12.8	1.38			9,149	Eclipse by a distant substellar companion with a 1.05 AU-radius debris disk

See also

• BD+20°307
• Disrupted planet
• Ecliptic Plane Input Catalog (EPIC)
• Gaia16aye
• Lists of astronomical objects
• List of semiregular variable stars
• Lists of stars
• List of variable stars
• Search for extraterrestrial intelligence
• WD 0145+234 (star disrupting an exoasteroid)

External links

• SIMBAD Astronomical Database by the Centre de données astronomiques de Strasbourg

Notes and References

1. News: Astronomers Have Found Another 21 Stars Dimming as Erratically as Tabby's Star . ScienceAlert . Starr . Michelle . 28 September 2019 . 28 September 2019.
2. A Search for Analogs of KIC 8462852 (Boyajian's Star): A Proof of Concept and the First Candidates . . Schmidt . Edward G. . 880 . 1 . L7 . July 2019 . 10.3847/2041-8213/ab2e77 . 2019ApJ...880L...7S. 199676552 . free .
3. Keenan . Philip C. . McNeil . Raymond C. . 1989 . The Perkins catalog of revised MK types for the cooler stars . Astrophysical Journal Supplement Series . 71 . 245 . 10.1086/191373 . 1989ApJS...71..245K . 123149047 .
4. Nicolet, B. . Catalogue of Homogeneous Data in the UBV Photoelectric Photometric System . Astronomy & Astrophysics . 1978 . 34 . 1–49 . 1978A&AS...34....1N .
5. Hipparcos, the New Reduction . van Leeuwen . F . November 2007 . . 2 . 653–664 . 474 . 10.1051/0004-6361:20078357 . Astronomy and Astrophysics . 2007A&A...474..653V . 0708.1752. 18759600 .
6. . Dimming Betelgeuse likely isn't cold, just dusty, new study shows . 6 March 2020 . . 6 March 2020.
7. Levesque . Emily M. . Massey . Philip . Betelgeuse just isn't that cool: Effective temperature alone cannot explain the recent dimming of Betelgeuse . The Astrophysical Journal Letters . 24 February 2020 . 891 . 2 . L37 . 10.3847/2041-8213/ab7935 . free . 2002.10463 . 2020ApJ...891L..37L . free . 211296241 .
8. HD 181469 . 12 July 2019.
9. Osborn . H. P. . Kenworthy . M. . etal . May 2019 . The PDS 110 observing campaign - photometric and spectroscopic observations reveal eclipses are aperiodic . . 485 . 2 . 1614–1625 . 10.1093/mnras/stz283 . free . 1901.07981 . 2019MNRAS.485.1614O.
10. Keenan . Philip C. . McNeil . Raymond C. . 1989-10-01 . The Perkins Catalog of Revised MK Types for the Cooler Stars . The Astrophysical Journal Supplement Series . 71 . 245 . 10.1086/191373 . 1989ApJS...71..245K . 123149047 . 0067-0049.
11. Watson . C. L. . 2006 . The International Variable Star Index (VSX) . The Society for Astronomical Sciences 25th Annual Symposium on Telescope Science. Held May 23–25 . 25 . 47 . 2006SASS...25...47W.
12. Parker . Richard J. . Crowther . Paul A. . Rate . Gemma . 2020 . Unlocking Galactic Wolf–Rayet stars with Gaia DR2 – II. Cluster and association membership . Monthly Notices of the Royal Astronomical Society . 495 . 1 . 1209–1226 . 2005.02533 . 2020MNRAS.495.1209R . 10.1093/mnras/staa1290 . free . 218516882.
13. News: . Astronomers find mysterious dusty object orbiting a star . 3 January 2022 . . 3 January 2022 .
14. Powell, Brian P. . et al. . Mysterious Dust-emitting Object Orbiting TIC 400799224 . 8 December 2021 . . 162 . 6 . 299 . 10.3847/1538-3881/ac2c81 . 2110.01019 . 2021AJ....162..299P . 238259420 . free .
15. Kenworthy . M. A. . Klaassen . P. D. . etal . January 2020 . ALMA and NACO observations towards the young exoring transit system J1407 (V1400 Cen) . . 633 . A115 . 10.1051/0004-6361/201936141 . 1912.03314 . 2020A&A...633A.115K.
16. Web site: Gaia17bpp . 2024-01-08 . gsaweb.ast.cam.ac.uk.
17. Tzanidakis . Anastasios . Davenport . James R. A. . Bellm . Eric C. . Wang . Yuankun . 2023-09-01 . Gaia17bpp: A Giant Star with the Deepest and Longest Known Dimming Event . The Astrophysical Journal . 955 . 1 . 69 . 10.3847/1538-4357/aceda7 . free . 2306.12409 . 2023ApJ...955...69T . 0004-637X.