View source for Astronomy:List of semiregular variable stars

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This is a '''list of semiregular variable stars'''.  Variability ranges are taken from the [[Astronomy:General Catalogue of Variable Stars|General Catalogue of Variable Stars]] (GCVS) where these are visual magnitudes, otherwise from the International Variable Star Index (VSX).  Spectral types are taken from the GCVS, which may differ from more recent MK spectral types but often defines a range.
{{dynamic list}}
{| class="wikitable sortable" style="font-size:90%;"
|- bgcolor="#efefef"
! Star
! Constellation
! Discovery
! Maximum ([[Astronomy:Apparent magnitude|m<sub>V</sub>]])
! Minimum ([[Astronomy:Apparent magnitude|m<sub>V</sub>]])
! Range
! Period (days)
! width="8%"|Spectral Type
! [[Astronomy:Semiregular variable star|Type]]
! width="25%"|Comment
|---
| [[Astronomy:Theta Apodis|θ Aps]]
| [[Astronomy:Apus|Apus]]
| &nbsp;
| {{ntsh|4.65}}4<sup>m</sup>.65
| {{ntsh|6.20}}6<sup>m</sup>.20
| {{nts|1.55}}
| {{nts|119}}
| M7III
| SRb
| &nbsp;
|---
| [[Astronomy:Beta Andromedae|β And]] (Mirach)
| [[Astronomy:Andromeda (constellation)|Andromeda]]
| &nbsp;
| {{ntsh|2.01}}2<sup>m</sup>.01
| {{ntsh|2.10}}2<sup>m</sup>.10
| {{nts|0.09}}
| {{nts|119}}
| M0IIIa
| SRb
| suspected
|---
|Z Aqr
|[[Astronomy:Aquarius (constellation)|Aquarius]]
|&nbsp;
| {{ntsh|7.4}}7<sup>m</sup>.4
| {{ntsh|10.2}}10<sup>m</sup>.2
| {{nts|2.8}}
| {{nts|136.6}}
| M1e-M7III
| SRa
| &nbsp;
|---
| [[Astronomy:V Aquilae|V Aql]]
| [[Astronomy:Aquila (constellation)|Aquila]]
| &nbsp;
| {{ntsh|6.6}}6<sup>m</sup>.6
| {{ntsh|8.4}}8<sup>m</sup>.4
| {{nts|1.8}}
| {{nts|353}}
| C5,4-C6,4(N6)
| SRb
| &nbsp;
|---
| W Boö
| [[Astronomy:Boötes|Boötes]]
| &nbsp;
| {{ntsh|4.49}}4<sup>m</sup>.49
| {{ntsh|5.4}}5<sup>m</sup>.40
| {{nts|0.67}}
| {{nts|450}}
| M2-M4III
| SRb:
| &nbsp;
|---
| [[Astronomy:VZ Camelopardalis|VZ Cam]]
| [[Astronomy:Camelopardalis|Camelopardalis]]
| &nbsp;
| {{ntsh|4.80}}4<sup>m</sup>.80
| {{ntsh|4.96}}4<sup>m</sup>.96
| {{nts|0.16}}
| {{nts|23.7}}
| M4IIIa
| 
| [[Astronomy:Slow irregular variable|Lb]] in GCVS
|---
| [[Astronomy:La Superba|Y CVn]] (La Superba)
| [[Astronomy:Canes Venatici|Canes Venatici]]
| &nbsp;
| {{ntsh|4.8}}4<sup>m</sup>.8
| {{ntsh|6.3}}6<sup>m</sup>.3
| {{nts|1.5}}
| {{nts|160}}
| C5,4J(N3)
| SRb
| one of the reddest stars visible to the unaided eye
|---
| [[Astronomy:Rho Cassiopeiae|ρ Cas]]
| [[Astronomy:Cassiopeia (constellation)|Cassiopeia]]
| L.D.Wells (1901)
| {{ntsh|4.1}}4<sup>m</sup>.1
| {{ntsh|6.2}}6<sup>m</sup>.2
| {{nts|2.1}}
| {{nts|320}}
| F8pIa-K0pIa-0
| SRd
|
|---
| [[Astronomy:WZ Cassiopeiae|WZ Cas]]
| [[Astronomy:Cassiopeia (constellation)|Cassiopeia]]
| &nbsp;
| {{ntsh|6.3}}6<sup>m</sup>.3
| {{ntsh|8.5}}8<sup>m</sup>.5
| {{nts|2.2}}
| 
| C9,2JLi(N1p)
| SRb
| Visual double star, visible through binoculars
|---
| [[Astronomy:2 Centauri|V806 Cen]]
| [[Astronomy:Centaurus|Centaurus]]
| &nbsp;
| {{ntsh|4.16}}4<sup>m</sup>.16
| {{ntsh|4.26}}4<sup>m</sup>.26
| {{nts|0.1}}
| {{nts|12}}
| M5III
| SRb
| &nbsp;
|---
| [[Astronomy:T Centauri|T Cen]]
| [[Astronomy:Centaurus|Centaurus]]
| &nbsp;
| {{ntsh|5.5}}5<sup>m</sup>.5
| {{ntsh|9.0}}9<sup>m</sup>.0
| {{nts|3.5}}
| {{nts|90.44}}
| K0:e-M4II:e
| SRa
| classified as [[Astronomy:RV Tauri variable|RV Tauri variable]] by some
|---
| [[Astronomy:V810 Centauri|V810 Cen]]
| [[Astronomy:Centaurus|Centaurus]]
| &nbsp;
| {{ntsh|4.95}}4<sup>m</sup>.95
| {{ntsh|5.12}}5<sup>m</sup>.12
| {{nts|0.17}}
| {{nts|130}}
| F5-G0Ia-0
| SRd
| B1 Iab companion
|---
| [[Astronomy:Mu Cephei|μ Cep]] (Herschel's Garnet Star)
| [[Astronomy:Cepheus (constellation)|Cepheus]]
| {{nowrap|William Herschel}} (1782)
| {{ntsh|3.43}}3<sup>m</sup>.43
| {{ntsh|5.1}}5<sup>m</sup>.10
| {{nts|1.67}}
| {{nts|730}}
| M2eIa
| SRc
| &nbsp;
|---
| SS Cep
| [[Astronomy:Cepheus (constellation)|Cepheus]]
| &nbsp;
| {{ntsh|6.5}}6<sup>m</sup>.5
| {{ntsh|7.7}}7<sup>m</sup>.7
| {{nts|1.2}}
| {{nts|90}}
| M5III
| SRb
| &nbsp;
|---
| AR Cep
| [[Astronomy:Cepheus (constellation)|Cepheus]]
| &nbsp;
| {{ntsh|7.0}}7<sup>m</sup>.0
| {{ntsh|7.9}}7<sup>m</sup>.9
| {{nts|0.9}}
| {{ntsh|364}}~364
| M4III
| SRb
| &nbsp;
|---
| [[Astronomy:T Ceti|T Cet]]
| [[Astronomy:Cetus|Cetus]]
| &nbsp;
| {{ntsh|4.96}}4<sup>m</sup>.96
| {{ntsh|6.90}}6<sup>m</sup>.90
| {{nts|1.94}}
| {{nts|159}}
| M5-6SIIe
| SRc
| &nbsp;
|---
| T Cnc
| [[Astronomy:Cancer (constellation)|Cancer]]
| [[Biography:John Russell Hind|Hind]] (1850)
| {{ntsh|7.6}}7<sup>m</sup>.6
| {{ntsh|10.5}}10<sup>m</sup>.5
| {{nts|2.9}}
| {{nts|482}}
| C3,8-C5,5(R6-N6)
| SRb
| &nbsp;
|---
| [[Astronomy:X Cancri|X Cnc]]
| [[Astronomy:Cancer (constellation)|Cancer]]
| &nbsp;
| {{ntsh|5.69}}5<sup>m</sup>.69
| {{ntsh|6.94}}6<sup>m</sup>.94
| {{nts|1.25}}
| {{nts|180}}
| C5,4(N3)
| SRb
| &nbsp;
|-
|[[Astronomy:RR Coronae Borealis|RR CrB]]
|[[Astronomy:Corona Borealis|Corona Borealis]]
| &nbsp;
| {{ntsh|7.3}}7<sup>m</sup>.3
| {{ntsh|8.2}}8<sup>m</sup>.2
| {{nts|0.9}}
| {{nts|60.8}}
| M3-M6
| SRb
| &nbsp;
|---
| [[Astronomy:W Cygni|W Cyg]]
| [[Astronomy:Cygnus (constellation)|Cygnus]]
| &nbsp;
| {{ntsh|5.10}}5<sup>m</sup>.10
| {{ntsh|6.83}}6<sup>m</sup>.83
| {{nts|1.73}}
| {{nts|131}}
| M4e-M6e(Tc:)III
| SRb
| &nbsp;
|-
|AF Cyg
|[[Astronomy:Cygnus (constellation)|Cygnus]]
| &nbsp;
| {{ntsh|6.4}}6<sup>m</sup>.4
| {{ntsh|7.7}}7<sup>m</sup>.7
| {{nts|1.3}}
| {{nts|92.5}}
| M5e-M7
| SRb
| &nbsp;
|---
| U Del
| [[Astronomy:Delphinus|Delphinus]]
| &nbsp;
| {{ntsh|6.14}}6<sup>m</sup>.14
| {{ntsh|7.61}}7<sup>m</sup>.61
| {{nts|1.47}}
| {{nts|110}}
| M5II-III
| SRb
| &nbsp;
|---
| EU Del
| [[Astronomy:Delphinus|Delphinus]]
| &nbsp;
| {{ntsh|5.79}}5<sup>m</sup>.79
| {{ntsh|6.9}}6<sup>m</sup>.9
| {{nts|1.11}}
| {{nts|59.7}}
| M6.4III
| SRb
| &nbsp;
|---
| [[Astronomy:Eta Geminorum|η Gem]] (Propus)
| [[Astronomy:Gemini (constellation)|Gemini]]
| Schmidt (1865)
| {{ntsh|3.15}}3<sup>m</sup>.15
| {{ntsh|3.90}}3<sup>m</sup>.90
| {{nts|0.75}}
| {{nts|233}}
| M3IIIab
| SRa
| also [[Astronomy:Algol variable|Algol eclipsing binary]]?
|---
| [[Astronomy:Alpha Herculis|α Her]] (Rasalgethi)
| [[Astronomy:Hercules (constellation)|Hercules]]
| {{nowrap|William Herschel}} (1759)
| {{ntsh|2.74}}2<sup>m</sup>.74
| {{ntsh|4.0}}4<sup>m</sup>.00
| {{nts|1.26}}
| 
| M5Ib-II
| SRc
| &nbsp;
|---
| [[Astronomy:30 Herculis|30 Her]]
| [[Astronomy:Hercules (constellation)|Hercules]]
| &nbsp;
| {{ntsh|4.3}}4<sup>m</sup>.3
| {{ntsh|6.3}}6<sup>m</sup>.3
| {{nts|2.0}}
| {{nts|89.2}}
| M6III
| SRb
| &nbsp;
|---
| [[Astronomy:X Herculis|X Her]]
| [[Astronomy:Hercules (constellation)|Hercules]]
| &nbsp;
| {{ntsh|5.8}}5<sup>m</sup>.8
| {{ntsh|7.0}}7<sup>m</sup>.0
| {{nts|1.1}}
| {{nts|95.0}}
| M6e
| SRb
| &nbsp;
|---
| [[Astronomy:U Hydrae|U Hya]]
| [[Astronomy:Hydra (constellation)|Hydra]]
| &nbsp;
| {{ntsh|4.56}}4<sup>m</sup>.56
| {{ntsh|5.40}}5<sup>m</sup>.40
| {{nts|2.4}}
| {{ntsh|450}}~450
| C6.5,3(N2)(Tc)
| SRb
| &nbsp;
|---
| [[Astronomy:RX Leporis|RX Lep]]
| [[Astronomy:Lepus (constellation)|Lepus]]
| &nbsp;
| {{ntsh|5.0}}5<sup>m</sup>.0
| {{ntsh|7.4}}7<sup>m</sup>.4
| {{nts|2.4}}
| {{ntsh|60}}~60
| M6.2III
| SRb
| &nbsp;
|---
| [[Astronomy:Sigma Librae|σ Lib]] (Brachium)
| [[Astronomy:Libra (constellation)|Libra]]
| &nbsp;
| {{ntsh|3.20}}3<sup>m</sup>.20
| {{ntsh|3.46}}3<sup>m</sup>.46
| {{nts|0.26}}
| {{nts|20}}
| M5III
| SRb
| &nbsp;
|---
| [[Astronomy:R Lyrae|R Lyr]]
| [[Astronomy:Lyra|Lyra]]
| &nbsp;
| {{ntsh|3.88}}3<sup>m</sup>.88
| {{ntsh|5.0}}5<sup>m</sup>.00
| {{nts|1.12}}
| {{ntsh|46}}~46
| M5III
| SRb
| &nbsp;
|---
| [[Astronomy:Betelgeuse|α Ori]] (Betelgeuse)
| [[Astronomy:Orion (constellation)|Orion]]
| [[Biography:John Herschel|John Herschel]] (1840)
| {{ntsh|0.0}}0<sup>m</sup>.0
| {{ntsh|1.3}}1<sup>m</sup>.3
| {{nts|1.3}}
| {{nts|2,335}}
| M1-M2Ia-Ibe
| SRc
| &nbsp;
|---
| [[Astronomy:W Orionis|W Ori]]
| [[Astronomy:Orion (constellation)|Orion]]
| &nbsp;
| {{ntsh|5.5}}5<sup>m</sup>.5
| {{ntsh|6.9}}6<sup>m</sup>.9
| {{nts|4.2}}
| {{nts|212}}
| C5,4(N5)
| SRb
| &nbsp;
|---
| CK Ori
| [[Astronomy:Orion (constellation)|Orion]]
| &nbsp;
| {{ntsh|5.9}}5<sup>m</sup>.9
| {{ntsh|7.1}}7<sup>m</sup>.1
| {{nts|1.2}}
| {{ntsh|120}}~120
| K2IIIe:
| 
| probably not variable
|---
| S Pav
| [[Astronomy:Pavo (constellation)|Pavo]]
| &nbsp;
| {{ntsh|6.6}}6<sup>m</sup>.6
| {{ntsh|10.4}}10<sup>m</sup>.4
| {{nts|3.8}}
| {{nts|381}}
| M7IIe-M8III
| SRa
| &nbsp;
|---
| GZ Peg
| [[Astronomy:Pegasus (constellation)|Pegasus]]
| &nbsp;
| {{ntsh|4.95}}4<sup>m</sup>.95
| {{ntsh|5.23}}5<sup>m</sup>.23
| {{nts|0.28}}
| {{nts|92.66}}
| M4SIII
| SRa
| &nbsp;
|---
| [[Astronomy:Rho Persei|ρ Per]]
| [[Astronomy:Perseus (constellation)|Perseus]]
| &nbsp;
| {{ntsh|3.30}}3<sup>m</sup>.30
| {{ntsh|4.0}}4<sup>m</sup>.00
| {{nts|0.70}}
| {{ntsh|50}}~50
| M4IIb-IIIa
| SRb
| &nbsp;
|---
| [[Astronomy:R Pictoris|R Pic]]
| [[Astronomy:Pictor|Pictor]]
| &nbsp;
| {{ntsh|6.35}}6<sup>m</sup>.35
| {{ntsh|10.1}}10<sup>m</sup>.10
| {{nts|3.75}}
| {{nts|171}}
| M1IIe-M4IIe
| 
| &nbsp;
|---
| [[Astronomy:L2 Puppis|L<sup>2</sup> Puppis]]
| [[Astronomy:Puppis|Puppis]]
| &nbsp;
| {{ntsh|2.6}}2<sup>m</sup>.6
| {{ntsh|6.2}}6<sup>m</sup>.2
| {{nts|3.6}}
| {{nts|141}}
| M5IIIe-M6IIIe
| SRb
| &nbsp;
|---
| [[Astronomy:VX Sagittarii|VX Sgr]]
| [[Astronomy:Sagittarius (constellation)|Sagittarius]]
| &nbsp;
| {{ntsh|6.52}}6<sup>m</sup>.52
| {{ntsh|14.0}}14<sup>m</sup>.00
| {{nts|7.08}}
| {{nts|732}}
| M4eIa-M10eIa
| SRc
| one of the [[Astronomy:List of largest known stars|largest stars known]]
|---
| [[Astronomy:Eta Sculptoris|η Scl]]
| [[Astronomy:Sculptor (constellation)|Sculptor]]
| Cousins/Stoy (1962)
| {{ntsh|4.8}}4<sup>m</sup>.8
| {{ntsh|4.9}}4<sup>m</sup>.9
| {{nts|0.1}}
| 
| M4IIIa
| SRb
| &nbsp;
|---
| [[Astronomy:Tau4 Serpentis|τ<sup>4</sup> Ser]]
| [[Astronomy:Serpens|Serpens]]
| &nbsp;
| {{ntsh|5.89}}5<sup>m</sup>.89
| {{ntsh|7.07}}7<sup>m</sup>.07
| {{nts|1.18}}
| {{nts|100}}
| M5IIb-IIIa
| SRb
| &nbsp;
|---
|CE Tau
|[[Astronomy:Taurus (constellation)|Taurus]]
| &nbsp;
| {{ntsh|4.23}}4<sup>m</sup>.23
| {{ntsh|4.54}}4<sup>m</sup>.54
| {{nts|0.31}}
| {{nts|165}}
| M2Iab-Ib
| SRc
| &nbsp;
|---
|[[Astronomy:SS Virginis|SS Vir]]
|[[Astronomy:Virgo (constellation)|Virgo]]
| &nbsp;
| {{ntsh|6.0}}6<sup>m</sup>.0
| {{ntsh|9.6}}9<sup>m</sup>.6
| {{nts|3.6}}
| {{nts|364.14}}
| C6,3e(Ne)
| SRa
|
|---
|SV UMa
|[[Astronomy:Ursa Major|Ursa Major]]
| &nbsp;
| {{ntsh|9.1}}9<sup>m</sup>.1
| {{ntsh|10.6}}10<sup>m</sup>.6
| {{nts|3.2}}
| {{nts|76}}
| G1Ibe-K3Iap
| SRd
|
|---
| Z UMa
| [[Astronomy:Ursa Major|Ursa Major]]
| &nbsp;
| {{ntsh|6.2}}6<sup>m</sup>.2
| {{ntsh|9.4}}9<sup>m</sup>.4
| {{nts|3.2}}
| {{nts|196}}
| M5IIIe
| SRb
| &nbsp;
|---
| [[Astronomy:RR Ursae Minoris|RR UMi]]
| [[Astronomy:Ursa Minor|Ursa Minor]]
| &nbsp;
| {{ntsh|4.44}}4<sup>m</sup>.44
| {{ntsh|4.85}}4<sup>m</sup>.85
| {{nts|0.41}}
| {{nts|43.3}}
| M5III
| SRb
| &nbsp;
|---
|}

==See also==
* [[Astronomy:Lists of astronomical objects|Lists of astronomical objects]]
* [[Astronomy:Lists of stars|Lists of stars]]
* List of stars that have unusual dimming periods
* [[Astronomy:Variable star designation|Variable star designation]]


[[Category:Lists of stars|Variable, semiregular]]
[[Category:Semiregular variable stars|* list]]

{{Sourceattribution|List of semiregular variable stars}}