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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 6:46  
clear_day Transit: 12:11  
SunsetSet: 17:36
sunny DaytimeWhat's Visible Now?
All Constellations » Sagittarius » 

ξ1 Sagittarii (xi1 Sagittarii)

Altitude: -30.6°   Azimuth: 274.8°   Direction: West

ξ1 Sagittarii is a hypergiant star in the constellation of Sagittarius.

ξ1 Sagittarii visual magnitude is 5.08. Because of its reltive faintness, ξ1 Sagittarii should be visible only from locations with dark skies, while it is not visible at all from skies affected by light pollution.

The proper motion of ξ1 Sagittarii is -0.001 arcsec per year in Right Ascension and -0.007 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of ξ1 Sagittarii (xi1 Sagittarii) star
DSS2 image of ξ1 Sagittarii. The red arrow shows the motion of ξ1 Sagittarii during the next 100000 years (-1.67 arcmin in Right Ascension and -11.67 arcmin in declination);

Key facts about ξ1 Sagittarii

5.08
Hypergiant

ξ1 Sagittarii (xi1 Sagittarii) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -30.6°
Azimuth: 274.8°
Direction: West

Celestial coordinates and finder chart of ξ1 Sagittarii

ξ1 Sagittarii is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of ξ1 Sagittarii are provided in the following table:

18h 57m 20s
-20° 39’ 23”
14.99°
-10.5°
Sagittarius

The simplified sky map below shows the position of ξ1 Sagittarii in the sky:

Finder chart ξ1 Sagittarii (xi1 Sagittarii) star
Simplified finder chart for ξ1 Sagittarii (xi1 Sagittarii).

Visibility of ξ1 Sagittarii from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's ξ1 Sagittarii (xi1 Sagittarii) rise, transit and set times from Greenwich, United Kingdom edit_location_alt are the following (all times relative to the local timezone Europe/London):

Azimuth: 110.7°
Max altitude: 17.9°
Azimuth: 249.3°

Distance of ξ1 Sagittarii from the Sun and relative movement

ξ1 Sagittarii is distant 5,015.38 light years from the Sun and it is moving far from the Sun at the speed of 2 kilometers per second.

1,538.46 pc
5,015.38 ly
2 km/s
-0.001 arcsec/year
-0.007 arcsec/year

Spectral properties of ξ1 Sagittarii

ξ1 Sagittarii belongs to spectral class A0 and has a luminosity class of II corresponding to a hypergiant star.

-5.86
A0II
8748K

The red dot in the diagram below shows where ξ1 Sagittarii is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of ξ1 Sagittarii. Attribution: Richard Powell / CC BY-SA

Alternative designations of ξ1 Sagittarii

ξ1 Sagittarii
(xi1 Sagittarii)
36 Sagittarii
SAO187498
SAO187498