Rasalgethi
HIP 84345; Alpha1 Her; 64 Her
Observable Double Star
Excellent (74/100)
Sep: 4.8", Companion: mag 5.4
Observable Variable Star
Range: 2.73 - 3.6, Period: 125.6d, Type: SRB
HIP 84345; Alpha1 Her; 64 Her
DoubleStar
Her
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
3.48
Range
2.73 - 3.6
Period
125.600 days
Variable Type
Semi-Regular Variable (Late-type Giant)
Spectral Type
M5Ib-II
Star Color
Red
(B-V 1.44)
Position & Identifiers
RA
17h 14m 38.9s
Dec
+14° 23' 25.0"
Constellation
Her
HR
6406
HIP
84345
Bayer
Alpha1
Flamsteed
64 Her
Variable ID
Alp Her
Double Cat
10418
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Visibility
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Light Curve
Comparison Stars for Rasalgethi (3.0–4.0)
Nearby stable stars for estimating brightness (AAVSO)
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Multiple Star System
Components
4
Component IDs
AB
Separation
4.8″
Companion Mag
5.4
Position Angle
102°
Star Colors
A: Red
Discoverer
STF2140
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 4.8″ · PA: 102° · N up, E left
Resolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 3.1″
Size Comparison
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Stellar Lifecycle
Spectral Classification
Hertzsprung-Russell Diagram
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Blackbody Spectrum
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
Stellar Notes
ADS 10418A. Discovered by W. Herschel in 1795. SRc 3.0 - 4.0v. 6-yr. period superimposed by variations 50 - 155d. | Surrounded by envelope of 2x10E+05 solar radii, expanding 10k/s, mass loss 3x10E-08 solar masses/y.
AB, 3600y, a = 4.68". Component B is HR 6407. Combined colors. Combined mag. 3.08V. Mass A, 14 solar. Other components | faint, optical. Circumstellar lines around both A, B.
Ultraviolet FeII emission. 5-micrometer observations indicate carbon monoxide.
0.008".
RASALGETHI; Ras Algethi; Rasalegti.
Diam. = 0.020 - 0.030".
Survey Image
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