12 Lac
Observable Variable Star
Good (49/100)
Range: 5.2 - 5.3, Period: 4.6h, Type: Beta C
HIP 112031; 12 Lac
VariableStar
Lac
Visible
Level 3
Medium telescope (6-8") - Monitor brightness changes
Physical Properties
Magnitude
5.25
Variable Type
Beta Cephei (Pulsating)
Spectral Type
B2III
Star Color
Blue-white
(B-V -0.14)
Position & Identifiers
RA
22h 41m 28.6s
Dec
+40° 13' 32.0"
Constellation
Lac
HR
8640
HIP
112031
Flamsteed
12 Lac
Variable ID
DD Lac
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Visibility
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Comparison Stars for 12 Lac (5.2–5.3)
Nearby stable stars for estimating brightness (AAVSO)
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Multiple Star System
Separation
65.8″
Companion Mag
10.8
Position Angle
11°
Star Colors
A: Blue-white
Discoverer
S 815
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 65.8″ · PA: 11° · 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
Beta C 5.16 - 5.28V, 0.1930924d. Six secondary periods reported, ranging from 0.095109 to 0.23583d.
B, 9.2A3V, physical, vsini 89k/s.
0.19d and slower var.
Lac OB1.
Survey Image
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