Rasalgethi
HIP 84345; Alpha1 Her; 64 Her
Excellent (74/100)
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
126 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 C,D: optical
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 Fusion
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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