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HIP 90913 — Star in Scutum

Magnitude 5.5m Star Scutum (Sct) Visible
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1Physical Properties

Magnitude 5.50
Spectral Type K3Ib-IICN1 supergiant
Star Color Deep ruby red (B-V 1.97)

2Position & Identifiers

RA 18h 32m 43.3s
Dec -14° 51' 56.0"
Constellation Scutum (Sct)
HR 6959
HIP 90913
HD 170975
SAO 161587
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 May – Jul (peak: Jun)

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.

NGC 6645
Easy
Open cluster
Open Cluster mag 9.0 2.0° Sagittarius
M17
Omega, Swan, Horseshoe, Lobster, or Checkmark Nebula
Easy
Emission nebula — try an OIII filter
Emission Nebula mag 6.0 3.2° Sagittarius
IC 4715 C
Easy
Noteworthy asterism
Asterism mag 4.50 3.9° Sagittarius
IC 1287
Medium+
Reflection nebula around a bright star
Reflection Nebula mag 6.10 4.1° Scutum
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