HR1978

HR1978 is a multiple giant star in the constellation of Orion.

HR1978 visual magnitude is 6.09. Because of its reltive faintness, HR1978 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 HR1978:

Color of HR1978 ⬤

Magnitude of HR1978 6.09

Class Giant

VISIBILITY RIGHT NOW HR1978 is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 38°.

Celestial coordinates and finder chart of HR1978

HR1978 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 HR1978 are provided in the following table:

Right Ascension J2000 05h 45m 01s

Declination J2000 +04° 00’ 29”

Galactic Longitude 201.57°

Galactic Latitude -12.81°

Constellation Orion

The simplified sky map below shows the position of HR1978 in the sky:

Simplified finder chart for HR1978.

Visibility of HR1978 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 HR1978 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: 86.0° RISE 7:55

Max altitude: 42.5° TRANSIT 14:13

Azimuth: 274.0° SET 20:31

RIGHT NOW HR1978 is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of HR1978

The image below is a photograph of HR1978 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 HR1978 is 0.02 arcsec per year in Right Ascension and -0.019 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of HR1978. The red arrow shows the motion of HR1978 during the next 10000 years (3.33 arcmin in Right Ascension and -3.17 arcmin in declination);

Distance of HR1978 from the Sun and relative movement

HR1978 is distant 164.73 light years from the Sun and it is moving far from the Sun at the speed of 8 kilometers per second.

Distance (parsec) 50.53 pc

Distance (light year) 164.73 ly

Heliocentric radial velocity 8 km/s

Proper Motion RA 0.02 arcsec/year

Proper Motion Dec -0.019 arcsec/year

Spectral properties of HR1978

HR1978 belongs to spectral class F0

Absolute magnitude 2.57

Spectral Type F0

Color Index (B-V) 0.31

Temperature of HR1978 7399K

The red dot in the diagram below shows where HR1978 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR1978. Attribution: Richard Powell / CC BY-SA

HR1978 star system properties

HR1978 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 HR1978 double sysyem:

Main star magnitude 6.09

Secondary star magnitude 10.29

Magnitude difference 4.2

Separation 15.7 arcsec

Alternative designations of HR1978

Henry Draper Catalogue HD38309

SAO Catalogue SAO113099

Hipparcos Catalogue HIP27118

Durchmusterung Catalogue BD+03 1025

Aitken Double Star Catalogue ADS4333

In Evidence

Other stars in Orion