ρ Hydrae (rho Hydrae)

Above the horizon. Rise: 9:33 | Tran: 16:05 | Set: 22:37

Alt: 34.81° Az: 143.93° Direction: South-West

ρ Hydrae is a double hypergiant star of spectral class A0 in the constellation of Hydra.

ρ Hydrae visual magnitude is 4.36. Because of its moderate brightness, ρ Hydrae is easily visible to the naked eye from locations with dark skies, while it might be barely visible, or not visible at all, from light-polluted skies.

DSS2 image of ρ Hydrae. The red arrow shows the motion of ρ Hydrae during the next 10000 years (-2.83 arcmin in Right Ascension and -5.67 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 08h 49m 46s

Declination +05° 44’ 32”

Hour Angle 22h 03m 43s

Sidereal Time 06h 53m 30s

J2000

Right Ascension 08h 48m 25s

Declination +05° 50’ 16”

Galactic Coordinates

Galactic Longitude 221.52°

Galactic Latitude 28.62°

Finder Chart

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Finder chart for ρ Hydrae (rho Hydrae).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 4.36

Class Hypergiant

Absolute magnitude -0.71

Spectral Type A0V

Color Index (B-V) -0.04

Temperature 10653K

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

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

Star System Properties

ρ 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 ρ Hydrae double sysyem:

Main star magnitude 4.36

Secondary star magnitude 13.06

Magnitude difference 8.7

Separation 12.4 arcsec

Distance, Radial Speed, Proper Motion

ρ Hydrae is distant 337.13 light years from the Sun and it is moving far from the Sun at the speed of 33 kilometers per second.

Distance (parsec) 103.41

Distance (light year) 337.13

Radial Speed 33 km/s

Proper Motion RA -0.017 arcsec/y

Proper Motion Dec -0.034"/y

Alternative Designations

Bayer designation ρ Hydrae
(rho Hydrae)

Flamsteed designation 13 Hydrae

Henry Draper Catalogue HD75137

SAO Catalogue SAO117146

Hipparcos Catalogue HIP43234

Durchmusterung Catalogue BD+06 2040

Aitken Double Star Catalogue ADS7006

Visibility from Your Location

Today's ρ Hydrae (rho Hydrae) rise, transit and set times from Coatbridge, United Kingdom are the following (all times relative to the local timezone Europe/London):

Azimuth: 84.3° RISE 9:33

Max altitude: 39.9° TRANSIT 16:05

Azimuth: 275.7° SET 22:37

Name:	Coatbridge, United Kingdom
Latitude:	55° 51' 43.9" N
Longitude:	4° 1' 28.9" W
Timezone:	Europe/London

Set Location

Other stars in Hydra