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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
SunriseRise: 6:42  
clear_day Transit: 12:10  
SunsetSet: 17:40
sleep NighttimeWhat's Visible Now?
All Constellations » Hydra » 

HR3921

Altitude: 16.0°   Azimuth: 180.8°   Direction: South

HR3921 is a star in the constellation of Hydra.

HR3921 visual magnitude is 6.24. Because of its reltive faintness, HR3921 should be visible only from locations with dark skies, while it is not visible at all from skies affected by light pollution.

The proper motion of HR3921 is -0.038 arcsec per year in Right Ascension and -0.031 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR3921 star
DSS2 image of HR3921. The red arrow shows the motion of HR3921 during the next 10000 years (-6.33 arcmin in Right Ascension and -5.17 arcmin in declination);

Key facts about HR3921

6.24

HR3921 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 16.0°
Azimuth: 180.8°
Direction: South

Celestial coordinates and finder chart of HR3921

HR3921 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 HR3921 are provided in the following table:

09h 54m 31s
-22° 29’ 17”
257.84°
24.51°
Hydra

The simplified sky map below shows the position of HR3921 in the sky:

Finder chart HR3921 star
Simplified finder chart for HR3921.

Visibility of HR3921 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 HR3921 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: 112.5°
Max altitude: 16.0°
Azimuth: 247.5°

Distance of HR3921 from the Sun and relative movement

HR3921 is distant 457.22 light years from the Sun and it is moving far from the Sun at the speed of 9 kilometers per second.

140.25 pc
457.22 ly
9 km/s
-0.038 arcsec/year
-0.031 arcsec/year

Spectral properties of HR3921

HR3921 belongs to spectral class A2

0.51
A2
9652K

The red dot in the diagram below shows where HR3921 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR3921. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR3921

SAO178164
SAO178164