θ2 Sagittarii (theta2 Sagittarii)

Altitude: -73.2° Azimuth: 1.6° Direction: North

θ2 Sagittarii is a multiple sub-giant star in the constellation of Sagittarius.

θ2 Sagittarii visual magnitude is 5.3. Because of its reltive faintness, θ2 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 θ2 Sagittarii:

Color of θ2 Sagittarii ⬤

Magnitude of θ2 Sagittarii 5.3

Class Sub-giant

VISIBILITY RIGHT NOW

θ2 Sagittarii (theta2 Sagittarii) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -73.2°
Azimuth: 1.6°
Direction: North

Celestial coordinates and finder chart of θ2 Sagittarii

θ2 Sagittarii is situated south of the celestial equator, as such, it is more easily visible from the southern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of θ2 Sagittarii are provided in the following table:

Right Ascension J2000 19h 59m 51s

Declination J2000 -34° 41’ 52”

Galactic Longitude 6.17°

Galactic Latitude -28.34°

Constellation Sagittarius

The simplified sky map below shows the position of θ2 Sagittarii in the sky:

Finder chart θ2 Sagittarii (theta2 Sagittarii) star

Simplified finder chart for θ2 Sagittarii (theta2 Sagittarii).

Visibility of θ2 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 θ2 Sagittarii (theta2 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: 124.7° RISE 18:32

Max altitude: 3.8° TRANSIT 20:30

Azimuth: 235.3° SET 22:28

Digitized Sky Survey image of θ2 Sagittarii

The image below is a photograph of θ2 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 θ2 Sagittarii is 0.1 arcsec per year in Right Ascension and -0.075 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of θ2 Sagittarii (theta2 Sagittarii) star

DSS2 image of θ2 Sagittarii. The red arrow shows the motion of θ2 Sagittarii during the next 1000 years (1.67 arcmin in Right Ascension and -1.25 arcmin in declination);

Distance of θ2 Sagittarii from the Sun and relative movement

θ2 Sagittarii is distant 156.66 light years from the Sun and it is moving towards the Sun at the speed of 18 kilometers per second.

Distance (parsec) 48.05 pc

Distance (light year) 156.66 ly

Heliocentric radial velocity -18 km/s

Proper Motion RA 0.1 arcsec/year

Proper Motion Dec -0.075 arcsec/year

Spectral properties of θ2 Sagittarii

θ2 Sagittarii belongs to spectral class A4 and has a luminosity class of IV corresponding to a sub-giant star.

Absolute magnitude 1.89

Spectral Type A4IV

Color Index (B-V) 0.17

Temperature of θ2 Sagittarii 8403K

The red dot in the diagram below shows where θ2 Sagittarii is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of θ2 Sagittarii. Attribution: Richard Powell / CC BY-SA

θ2 Sagittarii star system properties

θ2 Sagittarii is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the θ2 Sagittarii double sysyem:

Main star magnitude 5.3

Secondary star magnitude 10.8

Magnitude difference 5.5

Separation 30 arcsec

Alternative designations of θ2 Sagittarii

Bayer designation θ2 Sagittarii
(theta2 Sagittarii)

Henry Draper Catalogue HD189118

SAO Catalogue SAO211717

Hipparcos Catalogue HIP98421

Durchmusterung Catalogue CD-3513832

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Other stars in Sagittarius