ψ Sagittarii (psi Sagittarii)

ψ Sagittarii is a multiple giant star in the constellation of Sagittarius.

ψ Sagittarii visual magnitude is 4.85. Because of its moderate brightness, ψ Sagittarii should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about ψ Sagittarii:

Color of ψ Sagittarii ⬤

Magnitude of ψ Sagittarii 4.85

Class Giant

VISIBILITY RIGHT NOW ψ Sagittarii (psi Sagittarii) is above the horizon from Greenwich, United Kingdom [change]. Altitude: 1°.

Celestial coordinates and finder chart of ψ Sagittarii

ψ 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 ψ Sagittarii are provided in the following table:

Right Ascension J2000 19h 15m 32s

Declination J2000 -25° 15’ 24”

Galactic Longitude 12.42°

Galactic Latitude -16.2°

Constellation Sagittarius

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

Finder chart ψ Sagittarii (psi Sagittarii) star

Simplified finder chart for ψ Sagittarii (psi Sagittarii).

Visibility of ψ Sagittarii from your location

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

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

Azimuth: 115.3° RISE 4:16

Max altitude: 13.3° TRANSIT 7:49

Azimuth: 244.7° SET 11:23

RIGHT NOW ψ Sagittarii (psi Sagittarii) is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of ψ Sagittarii

The image below is a photograph of ψ 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 ψ Sagittarii is 0.045 arcsec per year in Right Ascension and -0.025 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of ψ Sagittarii (psi Sagittarii) star

DSS2 image of ψ Sagittarii. The red arrow shows the motion of ψ Sagittarii during the next 10000 years (7.50 arcmin in Right Ascension and -4.17 arcmin in declination);

Distance of ψ Sagittarii from the Sun and relative movement

ψ Sagittarii is distant 329.63 light years from the Sun and it is moving towards the Sun at the speed of 33 kilometers per second.

Distance (parsec) 101.11 pc

Distance (light year) 329.63 ly

Heliocentric radial velocity -33 km/s

Proper Motion RA 0.045 arcsec/year

Proper Motion Dec -0.025 arcsec/year

Spectral properties of ψ Sagittarii

ψ Sagittarii belongs to spectral class G8 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude -0.17

Spectral Type G8III

Color Index (B-V) 0.56

Temperature of ψ Sagittarii 6129K

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

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

ψ Sagittarii star system properties

ψ 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 ψ Sagittarii double sysyem:

Main star magnitude 4.85

Secondary star magnitude 5.15

Magnitude difference 0.3

Separation 0.1 arcsec

Alternative designations of ψ Sagittarii

Bayer designation ψ Sagittarii
(psi Sagittarii)

Flamsteed designation 42 Sagittarii

Henry Draper Catalogue HD179950

SAO Catalogue SAO187882

Hipparcos Catalogue HIP94643

Durchmusterung Catalogue CD-2513866

Aitken Double Star Catalogue ADS12214

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Other stars in Sagittarius