This is a list of semiregular variable stars. Variability ranges are taken from the 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.
This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by adding missing items with reliable sources.
Star
Constellation
Discovery
Maximum (mV)
Minimum (mV)
Range
Period (days)
Spectral Type
Type
Comment
θ Aps
Apus
4m.65
6m.20
1.55
119
M7III
SRb
β And (Mirach)
Andromeda
2m.01
2m.10
0.09
119
M0IIIa
SRb
suspected
Z Aqr
Aquarius
7m.4
10m.2
2.8
136.6
M1e-M7III
SRa
V Aql
Aquila
6m.6
8m.4
1.8
353
C5,4-C6,4(N6)
SRb
W Boö
Boötes
4m.49
5m.40
0.67
450
M2-M4III
SRb:
VZ Cam
Camelopardalis
4m.80
4m.96
0.16
23.7
M4IIIa
Lb in GCVS
Y CVn (La Superba)
Canes Venatici
4m.8
6m.3
1.5
160
C5,4J(N3)
SRb
one of the reddest stars visible to the unaided eye
ρ Cas
Cassiopeia
L.D.Wells (1901)
4m.1
6m.2
2.1
320
F8pIa-K0pIa-0
SRd
WZ Cas
Cassiopeia
6m.3
8m.5
2.2
C9,2JLi(N1p)
SRb
Visual double star, visible through binoculars
V806 Cen
Centaurus
4m.16
4m.26
0.1
12
M5III
SRb
T Cen
Centaurus
5m.5
9m.0
3.5
90.44
K0:e-M4II:e
SRa
classified as RV Tauri variable by some
V810 Cen
Centaurus
4m.95
5m.12
0.17
130
F5-G0Ia-0
SRd
B1 Iab companion
μ Cep (Herschel's Garnet Star)
Cepheus
William Herschel (1782)
3m.43
5m.10
1.67
730
M2eIa
SRc
SS Cep
Cepheus
6m.5
7m.7
1.2
90
M5III
SRb
AR Cep
Cepheus
7m.0
7m.9
0.9
~364
M4III
SRb
T Cet
Cetus
4m.96
6m.90
1.94
159
M5-6SIIe
SRc
T Cnc
Cancer
Hind (1850)
7m.6
10m.5
2.9
482
C3,8-C5,5(R6-N6)
SRb
X Cnc
Cancer
5m.69
6m.94
1.25
180
C5,4(N3)
SRb
RR CrB
Corona Borealis
7m.3
8m.2
0.9
60.8
M3-M6
SRb
W Cyg
Cygnus
5m.10
6m.83
1.73
131
M4e-M6e(Tc:)III
SRb
AF Cyg
Cygnus
6m.4
7m.7
1.3
92.5
M5e-M7
SRb
U Del
Delphinus
6m.14
7m.61
1.47
110
M5II-III
SRb
EU Del
Delphinus
5m.79
6m.9
1.11
59.7
M6.4III
SRb
η Gem (Propus)
Gemini
Schmidt (1865)
3m.15
3m.90
0.75
233
M3IIIab
SRa
also Algol eclipsing binary?
α Her (Rasalgethi)
Hercules
William Herschel (1759)
2m.74
4m.00
1.26
M5Ib-II
SRc
30 Her
Hercules
4m.3
6m.3
2.0
89.2
M6III
SRb
X Her
Hercules
5m.8
7m.0
1.1
95.0
M6e
SRb
U Hya
Hydra
4m.56
5m.40
2.4
~450
C6.5,3(N2)(Tc)
SRb
RX Lep
Lepus
5m.0
7m.4
2.4
~60
M6.2III
SRb
σ Lib (Brachium)
Libra
3m.20
3m.46
0.26
20
M5III
SRb
R Lyr
Lyra
3m.88
5m.00
1.12
~46
M5III
SRb
α Ori (Betelgeuse)
Orion
John Herschel (1840)
0m.0
1m.3
1.3
2,335
M1-M2Ia-Ibe
SRc
W Ori
Orion
5m.5
6m.9
4.2
212
C5,4(N5)
SRb
CK Ori
Orion
5m.9
7m.1
1.2
~120
K2IIIe:
probably not variable
S Pav
Pavo
6m.6
10m.4
3.8
381
M7IIe-M8III
SRa
GZ Peg
Pegasus
4m.95
5m.23
0.28
92.66
M4SIII
SRa
ρ Per
Perseus
3m.30
4m.00
0.70
~50
M4IIb-IIIa
SRb
R Pic
Pictor
6m.35
10m.10
3.75
171
M1IIe-M4IIe
L2 Puppis
Puppis
2m.6
6m.2
3.6
141
M5IIIe-M6IIIe
SRb
VX Sgr
Sagittarius
6m.52
14m.00
7.08
732
M4eIa-M10eIa
SRc
one of the largest stars known
η Scl
Sculptor
Cousins/Stoy (1962)
4m.8
4m.9
0.1
M4IIIa
SRb
τ4 Ser
Serpens
5m.89
7m.07
1.18
100
M5IIb-IIIa
SRb
CE Tau
Taurus
4m.23
4m.54
0.31
165
M2Iab-Ib
SRc
SS Vir
Virgo
6m.0
9m.6
3.6
364.14
C6,3e(Ne)
SRa
SV UMa
Ursa Major
9m.1
10m.6
3.2
76
G1Ibe-K3Iap
SRd
Z UMa
Ursa Major
6m.2
9m.4
3.2
196
M5IIIe
SRb
RR UMi
Ursa Minor
4m.44
4m.85
0.41
43.3
M5III
SRb
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