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4 Lacertae — Star in Lacerta

Magnitude 4.6m Star Lacerta (Lac) Visible
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1Physical Properties

Magnitude 4.57
Spectral Type B9Iab supergiant
Star Color White (B-V 0.09)
Distance 1,087 ly

2Position & Identifiers

RA 22h 24m 31.0s
Dec +49° 28' 35.0"
Constellation Lacerta (Lac)
HR 8541
HIP 110609
HD 212593
SAO 51970
Flamsteed 4 Lac
SIMBAD

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Medium+ Medium Hard+
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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6

Size Comparison

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7

Compare Stars

8

Spectral Classification

9

Hertzsprung-Russell Diagram

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Read: The Hertzsprung-Russell Diagram — Reading Stars Like a Map
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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14

Light Travel Time Machine

15

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 1.6° Lacerta
5 Lac
Easy
Cool red giant
Star mag 4.36 2.0° Lacerta
AR Lac
Medium
Eclipsing binary, period 2.0d
Variable Star mag 6.11 4.6° Lacerta
Cocoon Nebula
IC 5146
Medium+
Emission nebula — try an OIII filter
Emission Nebula mag 10.0 5.6° Cygnus
Show on Map

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