υ2 Hydrae (upsilon2 Hydrae)

υ2 Hydrae is a variable giant star in the constellation of Hydra.

υ2 Hydrae visual magnitude is 4.6. Because of its moderate brightness, υ2 Hydrae 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 υ2 Hydrae:

Color of υ2 Hydrae ⬤

Magnitude of υ2 Hydrae 4.6

Class Giant

VISIBILITY RIGHT NOW υ2 Hydrae (upsilon2 Hydrae) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Celestial coordinates and finder chart of υ2 Hydrae

υ2 Hydrae 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 υ2 Hydrae are provided in the following table:

Right Ascension J2000 10h 05m 07s

Declination J2000 -13° 03’ 52”

Galactic Longitude 252.46°

Galactic Latitude 33.06°

Constellation Hydra

The simplified sky map below shows the position of υ2 Hydrae in the sky:

Finder chart υ2 Hydrae (upsilon2 Hydrae) star

Simplified finder chart for υ2 Hydrae (upsilon2 Hydrae).

Visibility of υ2 Hydrae 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 υ2 Hydrae (upsilon2 Hydrae) 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: 103.1° RISE 13:42

Max altitude: 25.5° TRANSIT 18:33

Azimuth: 256.9° SET 23:23

RIGHT NOW υ2 Hydrae (upsilon2 Hydrae) is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of υ2 Hydrae

The image below is a photograph of υ2 Hydrae 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 υ2 Hydrae is -0.037 arcsec per year in Right Ascension and 0.018 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of υ2 Hydrae (upsilon2 Hydrae) star

DSS2 image of υ2 Hydrae. The red arrow shows the motion of υ2 Hydrae during the next 10000 years (-6.17 arcmin in Right Ascension and 3.00 arcmin in declination);

Distance of υ2 Hydrae from the Sun and relative movement

υ2 Hydrae is distant 276.98 light years from the Sun and it is moving far from the Sun at the speed of 28 kilometers per second.

Distance (parsec) 84.96 pc

Distance (light year) 276.98 ly

Heliocentric radial velocity 28 km/s

Proper Motion RA -0.037 arcsec/year

Proper Motion Dec 0.018 arcsec/year

Spectral properties of υ2 Hydrae

υ2 Hydrae belongs to spectral class B9 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude -0.05

Spectral Type B9III

Color Index (B-V) -0.09

Temperature of υ2 Hydrae 11407K

The red dot in the diagram below shows where υ2 Hydrae is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of υ2 Hydrae. Attribution: Richard Powell / CC BY-SA

Alternative designations of υ2 Hydrae

Bayer designation υ2 Hydrae
(upsilon2 Hydrae)

Flamsteed designation 40 Hydrae

Henry Draper Catalogue HD87504

SAO Catalogue SAO155713

Hipparcos Catalogue HIP49402

Durchmusterung Catalogue BD-12 3073

FK5 Catalogue 1261

General Catalogue of Variable Stars 4725

In Evidence

Other stars in Hydra