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11 Sagittae — Star in Sagitta

Magnitude 5.5m Star Sagitta (Sge) Visible
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1Physical Properties

Magnitude 5.53
Spectral Type B9III giant
Star Color Blue-white (B-V -0.05)

2Position & Identifiers

RA 19h 57m 45.4s
Dec +16° 47' 21.0"
Constellation Sagitta (Sge)
HR 7622
HIP 98234
HD 189090
SAO 105471
Flamsteed 11 Sge
SIMBAD

3How easy to spot?

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

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

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.

10 Sge
Medium+
Pulsating variable, period 8.4d
Variable Star mag 5.36 0.4° Sagitta
M71
NGC 6838
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 8.3 2.2° Sagitta
9 Sge
Easy
Hot blue O-type star
Star mag 6.23 2.3° Sagitta
Gamma Sge
Easy
Cool red giant
Star mag 3.47 2.7° Sagitta
Pi Aql
Hard+
Tight double — a rewarding split at 1.4″
Double Star mag 5.72 5.4° Aquila
M27
NGC 6853
Easy
Planetary nebula — try an OIII filter
Planetary Nebula mag 8.1 5.9° Vulpecula
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