HR3931

Below the horizon. Rise: 6:05 | Tran: 9:28 | Set: 12:50

Alt: -38.31° Az: 85.76° Direction: East

HR3931 is a double main-sequence star of spectral class A4 in the constellation of Hydra.

HR3931 visual magnitude is 6.28. Because of its faintness, HR3931 is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.

DSS2 image of HR3931. The red arrow shows the motion of HR3931 during the next 1000 years (-1.90 arcmin in Right Ascension and 0.10 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 09h 57m 54s

Declination -26° 40’ 08”

Hour Angle 16h 04m 31s

Sidereal Time 02h 02m 25s

J2000

Right Ascension 09h 56m 46s

Declination -26° 33’ 01”

Galactic Coordinates

Galactic Longitude 261.22°

Galactic Latitude 21.85°

Finder Chart

Simplified finder chart for HR3931.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 6.28

Class Main-sequence

Absolute magnitude 2.07

Spectral Type A4V

Color Index (B-V) 0.22

Temperature 8011K

The red dot in the diagram below shows where HR3931 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR3931. Attribution: Richard Powell / CC BY-SA

Star System Properties

HR3931 is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the HR3931 double sysyem:

Main star magnitude 6.28

Secondary star magnitude 10.68

Magnitude difference 4.4

Separation 3.4 arcsec

Distance, Radial Speed, Proper Motion

HR3931 is distant 226.55 light years from the Sun and it is moving far from the Sun at the speed of 11 kilometers per second.

Distance (parsec) 69.49

Distance (light year) 226.55

Radial Speed 11 km/s

Proper Motion RA -0.114 arcsec/y

Proper Motion Dec 0.006"/y

Alternative Designations

Henry Draper Catalogue HD86266

SAO Catalogue SAO178214

Hipparcos Catalogue HIP48763

Durchmusterung Catalogue CD-25 7622

Aitken Double Star Catalogue ADS7591

Visibility from Your Location

Today's HR3931 rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 116.7° RISE 6:05

Max altitude: 11.9° TRANSIT 9:28

Azimuth: 243.3° SET 12:50

Set Location

Other stars in Hydra