φ2 Hydrae (phi2 Hydrae)

Altitude: -19.8° Azimuth: 268.3° Direction: West

φ2 Hydrae is a double giant star in the constellation of Hydra.

φ2 Hydrae visual magnitude is 6.03. Because of its reltive faintness, φ2 Hydrae 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 φ2 Hydrae:

Color of φ2 Hydrae ⬤

Magnitude of φ2 Hydrae 6.03

Class Giant

VISIBILITY RIGHT NOW

φ2 Hydrae (phi2 Hydrae) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -19.8°
Azimuth: 268.3°
Direction: West

Celestial coordinates and finder chart of φ2 Hydrae

φ2 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 φ2 Hydrae are provided in the following table:

Right Ascension J2000 10h 36m 16s

Declination J2000 -16° 20’ 39”

Galactic Longitude 261.94°

Galactic Latitude 35.55°

Constellation Hydra

The simplified sky map below shows the position of φ2 Hydrae in the sky:

Finder chart φ2 Hydrae (phi2 Hydrae) star

Simplified finder chart for φ2 Hydrae (phi2 Hydrae).

Visibility of φ2 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 φ2 Hydrae (phi2 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: 106.3° RISE 1:20

Max altitude: 22.2° TRANSIT 5:52

Azimuth: 253.7° SET 10:25

Digitized Sky Survey image of φ2 Hydrae

The image below is a photograph of φ2 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 φ2 Hydrae is -0.026 arcsec per year in Right Ascension and -0.001 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of φ2 Hydrae. The red arrow shows the motion of φ2 Hydrae during the next 10000 years (-4.33 arcmin in Right Ascension and -0.17 arcmin in declination);

Distance of φ2 Hydrae from the Sun and relative movement

φ2 Hydrae is distant 967.36 light years from the Sun and it is moving far from the Sun at the speed of 16 kilometers per second.

Distance (parsec) 296.74 pc

Distance (light year) 967.36 ly

Heliocentric radial velocity 16 km/s

Proper Motion RA -0.026 arcsec/year

Proper Motion Dec -0.001 arcsec/year

Spectral properties of φ2 Hydrae

φ2 Hydrae belongs to spectral class M1 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude -1.33

Spectral Type M1III

Color Index (B-V) 1.65

Temperature of φ2 Hydrae 3581K

The red dot in the diagram below shows where φ2 Hydrae is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of φ2 Hydrae. Attribution: Richard Powell / CC BY-SA

φ2 Hydrae star system properties

φ2 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 φ2 Hydrae double sysyem:

Main star magnitude 6.03

Secondary star magnitude 13.03

Magnitude difference 7

Separation 3.4 arcsec

Alternative designations of φ2 Hydrae

Bayer designation φ2 Hydrae
(phi2 Hydrae)

Henry Draper Catalogue HD91880

SAO Catalogue SAO156093

Hipparcos Catalogue HIP51905

Durchmusterung Catalogue BD-15 3087

Aitken Double Star Catalogue ADS7847

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