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5 Lacertae — Star in Lacerta

Magnitude 4.2–4.4m Star Lacerta (Lac) Visible
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1Physical Properties

Magnitude 4.36
Range 4.23 - 4.43
Variable Type LC
Spectral Type M0II+B8V bright giant
Star Color Red (B-V 1.68)
Distance 544 ly

2Position & Identifiers

RA 22h 29m 31.8s
Dec +47° 42' 25.0"
Constellation Lacerta (Lac)
HR 8572
HIP 111022
HD 213311
Flamsteed 5 Lac
SIMBAD

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Medium+ Medium+ Medium
50mm finder Easy Easy Easy
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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7

Size Comparison

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8

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9

Spectral Classification

10

Hertzsprung-Russell Diagram

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Read: The Hertzsprung-Russell Diagram — Reading Stars Like a Map
11

Stellar Lifecycle

12

Blackbody Spectrum

13

Stellar Absorption Spectrum

Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.

14

Stellar Fusion

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15Stellar Notes

41.95y, K 12.2k/s, V0 -3.4k/s, asini 2240. Unresolved by speckle interferometry. SKYLAB indicates cool star with | hot companion. vsini of B-type component 90:k/s.
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Light Travel Time Machine

17

Relativistic Travel

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.

NGC 7243
Easy
Rich open cluster
Open Cluster mag 6.4 3.2° Lacerta
AR Lac
Medium
Eclipsing binary, period 2.0d
Variable Star mag 6.11 4.1° Lacerta
Cocoon Nebula
IC 5146
Medium+
Emission nebula — try an OIII filter
Emission Nebula mag 10.0 6.1° Cygnus
Show on Map

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