28 Sagittarii

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

28 Sagittarii visual magnitude is 5.37. Because of its reltive faintness, 28 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 28 Sagittarii:

Color of 28 Sagittarii ⬤

Magnitude of 28 Sagittarii 5.37

Class Giant

VISIBILITY RIGHT NOW 28 Sagittarii is below the horizon from Greenwich, United Kingdom [change].

Celestial coordinates and finder chart of 28 Sagittarii

28 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 28 Sagittarii are provided in the following table:

Right Ascension J2000 18h 46m 20s

Declination J2000 -22° 23’ 31”

Galactic Longitude 12.28°

Galactic Latitude -8.94°

Constellation Sagittarius

The simplified sky map below shows the position of 28 Sagittarii in the sky:

Simplified finder chart for 28 Sagittarii.

Visibility of 28 Sagittarii from your location

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

Today's 28 Sagittarii rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 112.4° RISE 3:34

Max altitude: 16.1° TRANSIT 7:28

Azimuth: 247.6° SET 11:22

RIGHT NOW 28 Sagittarii is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 28 Sagittarii

The image below is a photograph of 28 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 28 Sagittarii is 0.031 arcsec per year in Right Ascension and 0 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of 28 Sagittarii. The red arrow shows the motion of 28 Sagittarii during the next 10000 years (5.17 arcmin in Right Ascension and 0.00 arcmin in declination);

Distance of 28 Sagittarii from the Sun and relative movement

28 Sagittarii is distant 1,278.43 light years from the Sun and it is moving towards the Sun at the speed of 3 kilometers per second.

Distance (parsec) 392.16 pc

Distance (light year) 1,278.43 ly

Heliocentric radial velocity -3 km/s

Proper Motion RA 0.031 arcsec/year

Spectral properties of 28 Sagittarii

28 Sagittarii belongs to spectral class K4 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude -2.60

Spectral Type K4III

Color Index (B-V) 1.64

Temperature of 28 Sagittarii 3594K

The red dot in the diagram below shows where 28 Sagittarii is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 28 Sagittarii. Attribution: Richard Powell / CC BY-SA

28 Sagittarii star system properties

28 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 28 Sagittarii double sysyem:

Main star magnitude 5.37

Secondary star magnitude 13.07

Magnitude difference 7.7

Separation 13.7 arcsec

Alternative designations of 28 Sagittarii

Flamsteed designation 28 Sagittarii

Henry Draper Catalogue HD173460

SAO Catalogue SAO187255

Hipparcos Catalogue HIP92111

Durchmusterung Catalogue BD-22 4854

Aitken Double Star Catalogue ADS11652

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