100 Aquarii

Altitude: 17.1° Azimuth: 177.8° Direction: South

100 Aquarii is a giant star in the constellation of Aquarius.

100 Aquarii visual magnitude is 6.29. Because of its reltive faintness, 100 Aquarii 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 100 Aquarii:

Color of 100 Aquarii ⬤

Magnitude of 100 Aquarii 6.29

Class Giant

VISIBILITY RIGHT NOW

100 Aquarii is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 17.1°
Azimuth: 177.8°
Direction: South

Celestial coordinates and finder chart of 100 Aquarii

100 Aquarii 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 100 Aquarii are provided in the following table:

Right Ascension J2000 23h 31m 42s

Declination J2000 -21° 22’ 09”

Galactic Longitude 46.21°

Galactic Latitude -70.96°

Constellation Aquarius

The simplified sky map below shows the position of 100 Aquarii in the sky:

Simplified finder chart for 100 Aquarii.

Visibility of 100 Aquarii 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 100 Aquarii 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: 111.4° RISE 19:45

Max altitude: 17.2° TRANSIT 23:46

Azimuth: 248.6° SET 3:50

Digitized Sky Survey image of 100 Aquarii

The image below is a photograph of 100 Aquarii 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 100 Aquarii is 0.009 arcsec per year in Right Ascension and 0.005 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

DSS2 image of 100 Aquarii. The red arrow shows the motion of 100 Aquarii during the next 100000 years (15.00 arcmin in Right Ascension and 8.33 arcmin in declination);

Distance of 100 Aquarii from the Sun and relative movement

100 Aquarii is distant 261.01 light years from the Sun and it is moving towards the Sun at the speed of 8 kilometers per second.

Distance (parsec) 80.06 pc

Distance (light year) 261.01 ly

Heliocentric radial velocity -8 km/s

Proper Motion RA 0.009 arcsec/year

Proper Motion Dec 0.005 arcsec/year

Spectral properties of 100 Aquarii

100 Aquarii belongs to spectral class A9 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude 1.77

Spectral Type A9III

Color Index (B-V) 0.33

Temperature of 100 Aquarii 7276K

The red dot in the diagram below shows where 100 Aquarii is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 100 Aquarii. Attribution: Richard Powell / CC BY-SA

Alternative designations of 100 Aquarii

Flamsteed designation 100 Aquarii

Henry Draper Catalogue HD221357

SAO Catalogue SAO191970

Hipparcos Catalogue HIP116118

Durchmusterung Catalogue BD-22 6141

FK5 Catalogue 3885

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In Evidence

Other stars in Aquarius