λ Hydrae (lambda Hydrae)

Altitude: 25.3° Azimuth: 193.5° Direction: South-South-West

λ Hydrae is a multiple hypergiant star in the constellation of Hydra.

λ Hydrae visual magnitude is 3.61. Because of its moderate brightness, λ 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 λ Hydrae:

Color of λ Hydrae ⬤

Magnitude of λ Hydrae 3.61

Class Hypergiant

VISIBILITY RIGHT NOW

λ Hydrae (lambda Hydrae) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 25.3°
Azimuth: 193.5°
Direction: South-South-West

Celestial coordinates and finder chart of λ Hydrae

λ 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 λ Hydrae are provided in the following table:

Right Ascension J2000 10h 10m 35s

Declination J2000 -12° 21’ 15”

Galactic Longitude 253.01°

Galactic Latitude 34.5°

Constellation Hydra

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

Finder chart λ Hydrae (lambda Hydrae) star

Simplified finder chart for λ Hydrae (lambda Hydrae).

Visibility of λ 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 λ Hydrae (lambda 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: 102.4° RISE 0:01

Max altitude: 26.2° TRANSIT 4:55

Azimuth: 257.6° SET 9:50

Digitized Sky Survey image of λ Hydrae

The image below is a photograph of λ 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 λ Hydrae is -0.202 arcsec per year in Right Ascension and -0.089 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

DSS2 image of λ Hydrae. The red arrow shows the motion of λ Hydrae during the next 1000 years (-3.37 arcmin in Right Ascension and -1.48 arcmin in declination);

Distance of λ Hydrae from the Sun and relative movement

λ Hydrae is distant 114.63 light years from the Sun and it is moving far from the Sun at the speed of 19 kilometers per second.

Distance (parsec) 35.16 pc

Distance (light year) 114.63 ly

Heliocentric radial velocity 19 km/s

Proper Motion RA -0.202 arcsec/year

Proper Motion Dec -0.089 arcsec/year

Spectral properties of λ Hydrae

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

Absolute magnitude 0.88

Spectral Type K0III

Color Index (B-V) 1.01

Temperature of λ Hydrae 4719K

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

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

λ Hydrae star system properties

λ Hydrae is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the λ Hydrae double sysyem:

Main star magnitude 3.61

Secondary star magnitude 11.31

Magnitude difference 7.7

Separation 112.2 arcsec

Alternative designations of λ Hydrae

Bayer designation λ Hydrae
(lambda Hydrae)

Flamsteed designation 41 Hydrae

Henry Draper Catalogue HD88284

SAO Catalogue SAO155785

Hipparcos Catalogue HIP49841

Durchmusterung Catalogue BD-11 2820

FK5 Catalogue 381

Aitken Double Star Catalogue ADS7671

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