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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 7:44  
clear_day Transit: 11:48  
SunsetSet: 15:51 south
sunny DaytimeWhat's Visible Now?
All Constellations » Hydra » 

φ3 Hydrae (phi3 Hydrae)

Altitude: -42.4°   Azimuth: 301.1°   Direction: West-North-West

φ3 Hydrae is a giant star in the constellation of Hydra.

φ3 Hydrae visual magnitude is 4.91. Because of its moderate brightness, φ3 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 φ3 Hydrae:


φ3 Hydrae (phi3 Hydrae) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -42.4°
Azimuth: 301.1°
Direction: West-North-West

Celestial coordinates and finder chart of φ3 Hydrae

φ3 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 φ3 Hydrae are provided in the following table:

10h 38m 35s
-16° 52’ 36”

The simplified sky map below shows the position of φ3 Hydrae in the sky:

Finder chart φ3 Hydrae (phi3 Hydrae) star
Simplified finder chart for φ3 Hydrae (phi3 Hydrae).

Visibility of φ3 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 φ3 Hydrae (phi3 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: 106.9°
Max altitude: 21.6°
Azimuth: 253.1°

Digitized Sky Survey image of φ3 Hydrae

The image below is a photograph of φ3 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 φ3 Hydrae is -0.097 arcsec per year in Right Ascension and 0.027 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of φ3 Hydrae (phi3 Hydrae) star
DSS2 image of φ3 Hydrae. The red arrow shows the motion of φ3 Hydrae during the next 1000 years (-1.62 arcmin in Right Ascension and 0.45 arcmin in declination);

Distance of φ3 Hydrae from the Sun and relative movement

φ3 Hydrae is distant 224.52 light years from the Sun and it is moving far from the Sun at the speed of 18 kilometers per second.

68.87 pc
224.52 ly
18 km/s
-0.097 arcsec/year
0.027 arcsec/year

Spectral properties of φ3 Hydrae

φ3 Hydrae belongs to spectral class G8 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where φ3 Hydrae is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of φ3 Hydrae. Attribution: Richard Powell / CC BY-SA

Alternative designations of φ3 Hydrae

φ3 Hydrae
(phi3 Hydrae)