Mira
68 Cet
Spectaculaire (86/100)
HIP 10826; 68 Cet
VariableStar
Cet
Visible
Niveau 1
Naked eye / Binoculars - Monitor brightness changes
Propriétés Physiques
Magnitude
3.04
Plage
2.0 - 10.1
Période
332 jours
Type variable
Mira (Long-period Pulsating)
Type Spectral
M5/6 IIIe
Couleur de l'Étoile
Rouge
(B-V 1.42)
Température
2943 K
Rayon
370.1 R☉
Distance
418 ly
Position et Identifiants
RA
02h 19m 20.7s
Dec
-02° 58' 39.0"
Constellation
Cet
HR
681
HIP
10826
Flamsteed
68 Cet
Variable ID
Omi Cet
Double Cat
1778
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Visibilité
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Courbe de Lumière
Étoiles de Comparaison for Mira (2.0–10.1)
Étoiles stables proches pour estimer la luminosité (AAVSO)
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Système Stellaire Multiple optique
Composantes
4
IDs des Composantes
AC
Séparation
71.5″
Mag du Compagnon
14.1
Angle de Position
68°
Couleurs des Étoiles
A: Rouge
Découvreur
BU 1371
Comparaison de taille
Cycle de vie stellaire
Classification spectrale
Diagramme de Hertzsprung-Russell
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Spectre du corps noir
Spectre d'absorption stellaire
Spectre d'absorption simulé basé sur le type spectral. Survolez les raies pour identifier les éléments.
Fusion Stellaire
Notes Stellaires
Two variables: Mira and VZ Cet. Mira, ADS 1778A, M 2.0 - 10.1v, 331.96d; var. CO emission from circumstellar envelope. | Speckle interferometry indicates large abrupt variation of diameter as a function of wavelength. Hydrogen lines vary on | time scale of 1-2 days. Mira was discovered to be variable by Fabricius in 1596, the first such variable discovered. | ADS 1778P, Ne "Novoides" class, VZ Cet, 9.5 - 12.0v, dBe.
AP var. M7IIIe, var. dBe, 400y, a = 0.85". The faint companion was first predicted in 1920 by Joy on the basis of a | slightly displaced blue secondary spectrum. First seen by Aitken in 1923. Visible only when Mira is faint. Light | variations on scale of hours superimposed by variations of 10-15 min. and rare flares of 2 min. duration. Components B, | 13v at 73" and C, optical.
The tabulated magnitude and colors refer to a time near maximum. Another determination at 6.99V gives B-V +1.56, | U-B +0.12, R-I +3.08.
Stratoscope II observations indicate infrared H2O bands. SiO maser source. Technetium found in spectrum. Also | classified M5e-M9e.
0.0058". Masses A 15.7, P 4.0 solar.
MIRA.
Image de Relevé
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