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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: 7:52  
clear_day Transit: 11:51  
SunsetSet: 15:49 south
sleep NighttimeWhat's Visible Now?
All Constellations » Hydra » 


Altitude: -34.4°   Azimuth: 85.9°   Direction: East

HR3946 is a variable main-sequence star in the constellation of Hydra.

HR3946 visual magnitude is 6.21. Because of its reltive faintness, HR3946 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 HR3946:


HR3946 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -34.4°
Azimuth: 85.9°
Direction: East

Celestial coordinates and finder chart of HR3946

HR3946 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 HR3946 are provided in the following table:

09h 59m 06s
-23° 57’ 01”

The simplified sky map below shows the position of HR3946 in the sky:

Finder chart HR3946 star
Simplified finder chart for HR3946.

Visibility of HR3946 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 HR3946 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: 114.0°
Max altitude: 14.6°
Azimuth: 246.0°

Digitized Sky Survey image of HR3946

The image below is a photograph of HR3946 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 HR3946 is -0.049 arcsec per year in Right Ascension and 0.023 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR3946 star
DSS2 image of HR3946. The red arrow shows the motion of HR3946 during the next 10000 years (-8.17 arcmin in Right Ascension and 3.83 arcmin in declination);

Distance of HR3946 from the Sun and relative movement

HR3946 is distant 628.13 light years from the Sun and it is moving far from the Sun at the speed of 15 kilometers per second.

192.68 pc
628.13 ly
15 km/s
-0.049 arcsec/year
0.023 arcsec/year

Spectral properties of HR3946

HR3946 belongs to spectral class B4 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR3946 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR3946. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR3946