HR1581

Altitude: -31.0° Azimuth: 77.0° Direction: East-North-East

HR1581 is a variable giant star in the constellation of Eridanus.

HR1581 visual magnitude is 5.72. Because of its reltive faintness, HR1581 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 HR1581:

Color of HR1581 ⬤

Magnitude of HR1581 5.72

Class Giant

VISIBILITY RIGHT NOW

HR1581 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -31.0°
Azimuth: 77.0°
Direction: East-North-East

Celestial coordinates and finder chart of HR1581

HR1581 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 HR1581 are provided in the following table:

Right Ascension J2000 04h 55m 18s

Declination J2000 -16° 25’ 04”

Galactic Longitude 215.61°

Galactic Latitude -32.9°

Constellation Eridanus

The simplified sky map below shows the position of HR1581 in the sky:

Simplified finder chart for HR1581.

Visibility of HR1581 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 HR1581 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: 106.4° RISE 19:13

Max altitude: 22.1° TRANSIT 23:45

Azimuth: 253.6° SET 4:20

Digitized Sky Survey image of HR1581

The image below is a photograph of HR1581 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 HR1581 is 0.01 arcsec per year in Right Ascension and 0.045 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of HR1581. The red arrow shows the motion of HR1581 during the next 10000 years (1.67 arcmin in Right Ascension and 7.50 arcmin in declination);

Distance of HR1581 from the Sun and relative movement

HR1581 is distant 288.50 light years from the Sun and it is moving far from the Sun at the speed of 32 kilometers per second.

Distance (parsec) 88.50 pc

Distance (light year) 288.50 ly

Heliocentric radial velocity 32 km/s

Proper Motion RA 0.01 arcsec/year

Proper Motion Dec 0.045 arcsec/year

Spectral properties of HR1581

HR1581 belongs to spectral class G4

Absolute magnitude 0.99

Spectral Type G4

Color Index (B-V) 0.88

Temperature of HR1581 5051K

The red dot in the diagram below shows where HR1581 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR1581. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR1581

Henry Draper Catalogue HD31444

SAO Catalogue SAO149988

Hipparcos Catalogue HIP22881

Durchmusterung Catalogue BD-16 992

FK5 Catalogue 2370

General Catalogue of Variable Stars R Eri

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In Evidence

Other stars in Eridanus