30 Sagittarii

30 Sagittarii is a double giant star in the constellation of Sagittarius.

30 Sagittarii visual magnitude is 6.61. Because of its reltive faintness, 30 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 30 Sagittarii:

Color of 30 Sagittarii ⬤

Magnitude of 30 Sagittarii 6.61

Class Giant

VISIBILITY RIGHT NOW 30 Sagittarii is above the horizon from Greenwich, United Kingdom [change]. Altitude: 8°.

Celestial coordinates and finder chart of 30 Sagittarii

30 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 30 Sagittarii are provided in the following table:

Right Ascension J2000 18h 50m 50s

Declination J2000 -22° 09’ 43”

Galactic Longitude 12.95°

Galactic Latitude -9.78°

Constellation Sagittarius

The simplified sky map below shows the position of 30 Sagittarii in the sky:

Simplified finder chart for 30 Sagittarii.

Visibility of 30 Sagittarii from your location

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

Today's 30 Sagittarii rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 112.2° RISE 2:53

Max altitude: 16.4° TRANSIT 6:48

Azimuth: 247.8° SET 10:44

RIGHT NOW 30 Sagittarii is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 30 Sagittarii

The image below is a photograph of 30 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 30 Sagittarii is -0.019 arcsec per year in Right Ascension and -0.033 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of 30 Sagittarii. The red arrow shows the motion of 30 Sagittarii during the next 10000 years (-3.17 arcmin in Right Ascension and -5.50 arcmin in declination);

Distance of 30 Sagittarii from the Sun and relative movement

30 Sagittarii is distant 244.93 light years from the Sun and it is moving towards the Sun at the speed of 35 kilometers per second.

Distance (parsec) 75.13 pc

Distance (light year) 244.93 ly

Heliocentric radial velocity -35 km/s

Proper Motion RA -0.019 arcsec/year

Proper Motion Dec -0.033 arcsec/year

Spectral properties of 30 Sagittarii

30 Sagittarii belongs to spectral class A7 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude 2.23

Spectral Type A7III

Color Index (B-V) 0.38

Temperature of 30 Sagittarii 6989K

The red dot in the diagram below shows where 30 Sagittarii is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 30 Sagittarii. Attribution: Richard Powell / CC BY-SA

30 Sagittarii star system properties

30 Sagittarii is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the 30 Sagittarii double sysyem:

Main star magnitude 6.61

Secondary star magnitude 13.41

Magnitude difference 6.8

Separation 21.1 arcsec

Alternative designations of 30 Sagittarii

Flamsteed designation 30 Sagittarii

Henry Draper Catalogue HD174309

SAO Catalogue SAO187342

Hipparcos Catalogue HIP92480

Durchmusterung Catalogue BD-22 4881

FK5 Catalogue 1493

Aitken Double Star Catalogue ADS11731

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Other stars in Sagittarius