Menu

HIP 90991 — Star in Scutum

Magnitude 5.8m Star Scutum (Sct) Visible
Star Map
+ List + Plan Star Hop

Observe

1Physical Properties

Magnitude 5.76
Spectral Type A2V
Star Color White (B-V 0.04)

2Position & Identifiers

RA 18h 33m 39.0s
Dec -14° 51' 13.0"
Constellation Scutum (Sct)
HR 6962
HIP 90991
HD 171130
SAO 161605
SIMBAD

3How easy to spot?

Sign in and configure your equipment and default location to see a personalized row.
Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Hard+ Hard V. 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

Set a location in User Settings to see visibility data.

Best season May – Jul (peak: Jun)

5Survey Image

Loading survey image…

Explore

6

Size Comparison

Querying VizieR for stellar data…
7

Compare Stars

8

Spectral Classification

9

Hertzsprung-Russell Diagram

Loading HR diagram…
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 3.4° Sagittarius
IC 4715 C
Easy
Noteworthy asterism
Asterism mag 4.50 4.0° Sagittarius
IC 1287
Medium+
Reflection nebula around a bright star
Reflection Nebula mag 6.10 4.1° Scutum
Show on Map

Explore Nightbase

Related knowledge, tools, and stories — no observation planning required.

Arthur Eddington
1919 eclipse expedition confirming general relativity; first theory of stellar interiors; the Eddington limit
Biography
The Life of Stars
From birth in a nebula to spectacular death — how stars are born, shine, swell, and die, and how to read the clues in their starlight.
Article
Scutum
Mythology, bright stars, and deep-sky highlights.
Constellation
}