AR Lac
Observable Variable Star
Good (59/100)
Range: 6.1 - 6.8, Period: 2.0d, Type: RS CVn
HIP 109303
VariableStar
Lac
Visible
Level 2
Small telescope (4") - Monitor brightness changes
Physical Properties
Magnitude
6.11
Variable Type
RS CVn (Chromospherically Active)
Spectral Type
G2IV+K0III
Star Color
Orange
(B-V 0.72)
Position & Identifiers
RA
22h 08m 41.0s
Dec
+45° 44' 31.0"
Constellation
Lac
HR
8448
HIP
109303
Variable ID
AR Lac
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Visibility
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Comparison Stars for AR Lac (6.1–6.8)
Nearby stable stars for estimating brightness (AAVSO)
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Multiple Star System
Separation
0.0″
Companion Mag
8.6
Position Angle
345°
Star Colors
A: Orange
Discoverer
YSC 15
Eyepiece View
15x
Dawes: 1.9″
TFOV: 3.3°
Realistic = true angular size
Sep: 0.0″ · PA: 345° · N up, E left
Unresolved · 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
EA 6.08 - 6.77V, RS CVn-type binary, 1.98319204d (period changes). Distortions in light curve possibly due to star | spots or to gas streams. Strong radio flare activity.
1.9832d, K 116.1k/s, V0 -33.7k/s, msin3i 1.28, asini 3.17. Masses 1.2 and 1.3 solar. Mass loss from primary. | Close radio binary.
Published classes range from F8, G2IV, G2Vn to G5IV for the earlier component, and K0IV to K2III for the later. Radio | emission source probably synchrotron emission.
Survey Image
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