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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: 7:47  
clear_day Transit: 11:49  
SunsetSet: 15:50 south
wb_twilight Astronomical TwilightWhat's Visible Now?
All Constellations » Hydra » 

HR4978

Altitude: 7.6°   Azimuth: 153.1°   Direction: South-South-East

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

HR4978 visual magnitude is 6.5. Because of its reltive faintness, HR4978 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 HR4978:

6.5
Main-sequence

HR4978 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 7.6°
Azimuth: 153.1°
Direction: South-South-East

Celestial coordinates and finder chart of HR4978

HR4978 is situated south of the celestial equator, as such, it is more easily visible from the southern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR4978 are provided in the following table:

13h 11m 39s
-26° 33’ 06”
308.53°
36.1°
Hydra

The simplified sky map below shows the position of HR4978 in the sky:

Finder chart HR4978 star
Simplified finder chart for HR4978.

Visibility of HR4978 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 HR4978 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: 116.6°
Max altitude: 12.0°
Azimuth: 243.4°

Digitized Sky Survey image of HR4978

The image below is a photograph of HR4978 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 HR4978 is -0.068 arcsec per year in Right Ascension and 0.004 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR4978 star
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);

Distance of HR4978 from the Sun and relative movement

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.

112.61 pc
367.12 ly
-21 km/s
-0.068 arcsec/year
0.004 arcsec/year

Spectral properties of HR4978

HR4978 belongs to spectral class A5 and has a luminosity class of V corresponding to a main-sequence star.

1.24
A5V
8241K

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

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

HR4978 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:

6.5
6.6
0.1
0.2 arcsec

Alternative designations of HR4978

SAO181446
SAO181446