18 Sagittarii

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

18 Sagittarii visual magnitude is 5.6. Because of its reltive faintness, 18 Sagittarii should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about 18 Sagittarii:

Color of 18 Sagittarii ⬤

Magnitude of 18 Sagittarii 5.6

Class Hypergiant

VISIBILITY RIGHT NOW 18 Sagittarii is below the horizon from Greenwich, United Kingdom [change].

Celestial coordinates and finder chart of 18 Sagittarii

18 Sagittarii is situated south of the celestial equator, as such, it is more easily visible from the southern emisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of 18 Sagittarii are provided in the following table:

Right Ascension J2000 18h 25m 01s

Declination J2000 -30° 45’ 24”

Galactic Longitude 2.57°

Galactic Latitude -8.35°

Constellation Sagittarius

The simplified sky map below shows the position of 18 Sagittarii in the sky:

Simplified finder chart for 18 Sagittarii.

Visibility of 18 Sagittarii from your location

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

Today's 18 Sagittarii rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 120.8° RISE 4:21

Max altitude: 7.8° TRANSIT 7:07

Azimuth: 239.2° SET 9:52

RIGHT NOW 18 Sagittarii is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 18 Sagittarii

The image below is a photograph of 18 Sagittarii from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.5x0.5 degrees (30x30 arcmins). The proper motion of 18 Sagittarii is -0.123 arcsec per year in Right Ascension and -0.072 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

DSS2 image of 18 Sagittarii. The red arrow shows the motion of 18 Sagittarii during the next 1000 years (-2.05 arcmin in Right Ascension and -1.20 arcmin in declination);

Distance of 18 Sagittarii from the Sun and relative movement

18 Sagittarii is distant 653.31 light years from the Sun and it is moving towards the Sun at the speed of 19 kilometers per second.

Distance (parsec) 200.40 pc

Distance (light year) 653.31 ly

Heliocentric radial velocity -19 km/s

Proper Motion RA -0.123 arcsec/year

Proper Motion Dec -0.072 arcsec/year

Spectral properties of 18 Sagittarii

18 Sagittarii belongs to spectral class K0 and has a luminosity class of III corresponding to a hypergiant star.

Absolute magnitude -0.91

Spectral Type K0III

Color Index (B-V) 1.14

Temperature of 18 Sagittarii 4430K

The red dot in the diagram below shows where 18 Sagittarii is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 18 Sagittarii. Attribution: Richard Powell / CC BY-SA

Alternative designations of 18 Sagittarii

Flamsteed designation 18 Sagittarii

Henry Draper Catalogue HD169233

SAO Catalogue SAO210116

Hipparcos Catalogue HIP90260

Durchmusterung Catalogue CD-3015661

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Other stars in Sagittarius