HR4978

Below the horizon. Rise: 18:39 | Tran: 22:02 | Set: 1:28

Alt: -28.31° Az: 261.82° Direction: West

HR4978 is a double main-sequence star of spectral class A5 in the constellation of Hydra.

HR4978 visual magnitude is 6.5. Because of its faintness, HR4978 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 HR4978. The red arrow shows the motion of HR4978 during the next 10000 years (-11.33 arcmin in Right Ascension and 0.67 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 13h 13m 02s

Declination -26° 41’ 09”

Hour Angle 06h 51m 01s

Sidereal Time 20h 04m 04s

J2000

Right Ascension 13h 11m 39s

Declination -26° 33’ 06”

Galactic Coordinates

Galactic Longitude 308.53°

Galactic Latitude 36.1°

Finder Chart

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Finder chart for HR4978.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 6.5

Class Main-sequence

Absolute magnitude 1.24

Spectral Type A5V

Color Index (B-V) 0.19

Temperature 8241K

The red dot in the diagram below shows where HR4978 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR4978. Attribution: Richard Powell / CC BY-SA

Star System Properties

HR4978 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 HR4978 double sysyem:

Main star magnitude 6.5

Secondary star magnitude 6.6

Magnitude difference 0.1

Separation 0.2 arcsec

Distance, Radial Speed, Proper Motion

HR4978 is distant 367.12 light years from the Sun and it is moving towards the Sun at the speed of 21 kilometers per second.

Distance (parsec) 112.61

Distance (light year) 367.12

Radial Speed -21 km/s

Proper Motion RA -0.068 arcsec/y

Proper Motion Dec 0.004"/y

Alternative Designations

Henry Draper Catalogue HD114576

SAO Catalogue SAO181446

Hipparcos Catalogue HIP64375

Durchmusterung Catalogue CD-25 9653

FK5 Catalogue 1341

Visibility from Your Location

Today's HR4978 rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 116.7° RISE 18:39

Max altitude: 11.8° TRANSIT 22:02

Azimuth: 243.3° SET 1:28

Set Location

Other stars in Hydra