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Zeta Sagittae — Star in Sagitta

Magnitude 5.0m Star Sagitta (Sge) Visible
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1Physical Properties

Magnitude 5.00
Spectral Type A3V
Star Color White (B-V 0.10)
Distance 326 ly

2Position & Identifiers

RA 19h 48m 58.7s
Dec +19° 08' 32.0"
Constellation Sagitta (Sge)
HR 7546
HIP 97496
HD 187362
SAO 105298
Bayer Zeta
Flamsteed 8 Sge
Double Cat 12973
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 Jun – Aug (peak: Jul)

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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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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14Stellar Notes

AB 5.5 A1V, 6.2 A3V, 22.8y, a = 0.146". Masses 4.0, 2.0 solar. C, 8.7v at 8" physical. Speckle interferometry 1985.5 | gives sep. 0.180".
0.010".
ADS 12973A, suspected SB.
15

Light Travel Time Machine

16

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.

9 Sge
Easy
Hot blue O-type star
Star mag 6.23 0.9° Sagitta
M71
NGC 6838
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 8.3 1.2° Sagitta
Gamma Sge
Easy
Cool red giant
Star mag 3.47 2.3° Sagitta
10 Sge
Medium+
Pulsating variable, period 8.4d
Variable Star mag 5.36 3.0° Sagitta
NGC 6830
Easy
Open cluster
Open Cluster mag 7.9 4.0° Vulpecula
M27
NGC 6853
Easy
Planetary nebula — try an OIII filter
Planetary Nebula mag 8.1 4.4° Vulpecula
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