Alnasl - γ2 Sagittarii (gamma2 Sagittarii)

Altitude: -33.7° Azimuth: 98.0° Direction: East

Alnasl, also designated as γ2 Sagittarii (gamma2 Sagittarii), is a variable hypergiant star in the constellation of Sagittarius.

Alnasl visual magnitude is 2.99. Thanks to its high brightness, Alnasl is clearly visible when observed from locations with dark skyes, and should be also quite easily visible from light polluted areas.

The table below summarizes the key facts about Alnasl:

Color of Alnasl ⬤

Magnitude of Alnasl 2.99

Class Hypergiant

VISIBILITY RIGHT NOW

Alnasl - γ2 Sagittarii (gamma2 Sagittarii) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -33.7°
Azimuth: 98.0°
Direction: East

Celestial coordinates and finder chart of Alnasl

Alnasl 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 Alnasl are provided in the following table:

Right Ascension J2000 18h 05m 48s

Declination J2000 -30° 25’ 27”

Galactic Longitude 0.92°

Galactic Latitude -4.54°

Constellation Sagittarius

The simplified sky map below shows the position of Alnasl in the sky:

Finder chart Alnasl - γ2 Sagittarii (gamma2 Sagittarii) star

Simplified finder chart for Alnasl - γ2 Sagittarii (gamma2 Sagittarii).

Visibility of Alnasl 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 Alnasl - γ2 Sagittarii (gamma2 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: 120.4° RISE 23:20

Max altitude: 8.1° TRANSIT 2:12

Azimuth: 239.6° SET 5:01

RIGHT NOW Alnasl - γ2 Sagittarii (gamma2 Sagittarii) is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of Alnasl

The image below is a photograph of Alnasl 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 Alnasl is -0.053 arcsec per year in Right Ascension and -0.185 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of Alnasl - γ2 Sagittarii (gamma2 Sagittarii) star

DSS2 image of Alnasl. The red arrow shows the motion of Alnasl during the next 1000 years (-0.88 arcmin in Right Ascension and -3.08 arcmin in declination);

Distance of Alnasl from the Sun and relative movement

Alnasl is distant 96.05 light years from the Sun and it is moving far from the Sun at the speed of 22 kilometers per second.

Distance (parsec) 29.46 pc

Distance (light year) 96.05 ly

Heliocentric radial velocity 22 km/s

Proper Motion RA -0.053 arcsec/year

Proper Motion Dec -0.185 arcsec/year

Spectral properties of Alnasl

Alnasl belongs to spectral class K0 and has a luminosity class of III corresponding to a hypergiant star.

Absolute magnitude 0.64

Spectral Type K0III

Color Index (B-V) 1

Temperature of Alnasl 4743K

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

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

Alternative designations of Alnasl

Proper Name Alnasl

Bayer designation γ2 Sagittarii
(gamma2 Sagittarii)

Flamsteed designation 10 Sagittarii

Henry Draper Catalogue HD165135

SAO Catalogue SAO209696

Hipparcos Catalogue HIP88635

Durchmusterung Catalogue CD-3015215

FK5 Catalogue 679

General Catalogue of Variable Stars 10173

In Evidence

Other stars in Sagittarius