12 Lacertae — Star in Lacerta
Observe
1Physical Properties
Magnitude
5.25
Range
5.16 - 5.28
Period
4.6 hours
Variable Type
Beta Cephei (Pulsating)
Spectral Type
B2III
giant
Star Color
Blue-white
(B-V -0.14)
2Position & Identifiers
RA
22h 41m 28.6s
Dec
+40° 13' 32.0"
Constellation
Lacerta
(Lac)
HR
8640
HIP
112031
HD
214993
SAO
72627
Flamsteed
12 Lac
Variable ID
DD Lac
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3How easy to spot?
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| Equipment | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| Naked eye Naked eye | Medium | Hard+ | Hard |
| 50 mm finder 50mm finder | Easy | Easy | Easy |
| 150 mm telescope 150mm scope | Easy | Easy | Easy |
Easy
Medium
Hard
Very hard
Impossible
Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs
4Visibility
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Best season
Jul – Sep
(peak: Aug)
5Survey Image
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6
Size Comparison
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7
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8
Spectral Classification
9
Hertzsprung-Russell Diagram
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10
Stellar Lifecycle
11
Blackbody Spectrum
12
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
13
Stellar Fusion
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14Stellar 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.
Nearby in the Sky
Other targets within a few degrees — pan your scope a little and keep exploring.
Visibility scores assume a 150 mm Newton at Bortle 4.
8 Lac
Easy double, sep 22.5″
Double Star
mag 5.73
1.2°
Lacerta
NGC 7330
Elliptical galaxy
Galaxy
mag 13.0
1.9°
Lacerta
15 Lac
Cool red giant
Star
mag 4.94
3.7°
Lacerta
AR Lac
Eclipsing binary, period 2.0d
Variable Star
mag 6.11
8.1°
Lacerta
Blue Snowball
NGC 7662
Small bright planetary nebula
Planetary Nebula
mag 9.0
8.6°
Andromeda
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Mythology, bright stars, and deep-sky highlights.
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The Hertzsprung-Russell Diagram — Reading Stars Like a Map
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