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Saiph

Kappa Orionis, 53 Orionis

Proper NameSaiph
Bayer DesignationKappa Orionis
Flamsteed Number53 Orionis
HR (BSC)2004
HD38771
ConstellationOrion
Right Ascension5h 47m 45s
Declination-9° 40' 11"
Distance647 light years
198 parsecs
MagnitudeApparent: +2.1
Absolute: -4.7
Spectral ClassB0 Blue Supergiant
Optimum VisibilityDecember / January
NotesA distant blue supergiant, Saiph is approximately 60,000 times as luminous as the Sun, and approximately thirty times as massive. Massive stars like this one tend to have relatively brief lifespans, and this is the case with Saiph: though only about six million years old - a fraction of the Sun's age - it has already reached the later stages of its stellar evolution.

Forming the eastern 'foot' of Orion in the night sky, Saiph is an immense and hot blue star of the supergiant type. Like many of the stars of Orion, it is distant from the Solar System, lying more than 600 light years from Earth.

HR Diagram
41 Draconis
47 Cygni
75 Cygni
a Velorum
AU Microscopii
AX Microscopii
b Velorum
Chaophraya
CS Camelopardalis
DH Tauri
e Aquilae
Ebla
ε Indi
Erakis
Felixvarela
Gakyid
Gar
Gliese 440
Gliese 687
Gliese 887
GX Andromedae
HD 37131
Nosaxa
HR 6842
IL Aquarii
k Hydrae
Kapteyn's Star
KELT-20
Kepler-102
Kepler-444
KR Muscae
Kruger 60 A
DO Cephei
La Superba
Mazaalai
Mekbuda
Miram
Nashira
ο1 Cygni
Petra
π Cephei
Pincoya
Polis
ρ Leonis
s Velorum A
Struve 2398 B
θ Hydrae
w Carinae
x Carinae
Xi Boötis B
15 Orionis
52 Orionis
Acubens
Adhafera
Alchiba
Alfirk
Alkaphrah
Alnilam
Antares
Arneb
Atria
Avior
Azmidi
Berehynia
Betelgeuse
BF Orionis
Capella
Cerberus
χ Cygni
d Lupi
δ Caeli
δ Muscae
Deneb
Diya
Dombay
EE Leonis
ε Reticuli
η Carinae
f Velorum
FL Virginis
γ Pavonis
Groombridge 1618
Hatysa
HD 37130
Hind's Crimson Star
HO Librae
HR 1911
ι Leonis B
ι1 Scorpii
Koeia
Mebsuta
Mira
Mirfak
Mu Aquilae
Naos
ν2 Canis Majoris
ν Cephei
ν Persei
ο Capricorni B
Orkaria
Polaris
Proxima Centauri
Ran
ρ Cygni
Rigel
α Centauri A
Ross 154
Ross 156
Sadr
Sargas
Schedar
Sharjah
σ Orionis
Sirius B
Suhail
τ Ceti
Teegarden's Star
Tevel
Thabit
θ Circini
Tureis
U Sagittarii
Unurgunite
UV Ceti
van Maanen's Star
Wezen
Wolf 359
Wolf 498
WX Ursae Majoris
ζ Arae
Saiph

Hertzprung-Russell diagram plotting the temperature and luminosity of Saiph (marked by the red circle) relative to other stars.

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