θ2 Sagittarii (theta2 Sagittarii)

Below the horizon. Rise: 1:12 | Tran: 3:11 | Set: 5:09

Alt: -0.69° Az: 153.81° Direction: South-South-East

θ2 Sagittarii is a multiple sub-giant star of spectral class A4 in the constellation of Sagittarius.

θ2 Sagittarii visual magnitude is 5.3. Because of its faintness, θ2 Sagittarii is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.

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);

Celestial Coordinates

Apparent

Right Ascension 20h 01m 29s

Declination -34° 37’ 35”

Hour Angle 21h 50m 17s

Sidereal Time 17h 51m 47s

J2000

Right Ascension 19h 59m 51s

Declination -34° 41’ 52”

Galactic Coordinates

Galactic Longitude 6.17°

Galactic Latitude -28.34°

Finder Chart

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Finder chart for θ2 Sagittarii (theta2 Sagittarii).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.3

Class Sub-giant

Absolute magnitude 1.89

Spectral Type A4IV

Color Index (B-V) 0.17

Temperature 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

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

Distance, Radial Speed, Proper Motion

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

Distance (light year) 156.66

Radial Speed -18 km/s

Proper Motion RA 0.1 arcsec/y

Proper Motion Dec -0.075"/y

Alternative Designations

Bayer designation θ2 Sagittarii
(theta2 Sagittarii)

Henry Draper Catalogue HD189118

SAO Catalogue SAO211717

Hipparcos Catalogue HIP98421

Durchmusterung Catalogue CD-3513832

Visibility from Your Location

Today's θ2 Sagittarii (theta2 Sagittarii) rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 124.6° RISE 1:12

Max altitude: 3.9° TRANSIT 3:11

Azimuth: 235.4° SET 5:09

Set Location

Other stars in Sagittarius