HR1781

Altitude: 15.6° Azimuth: 249.1° Direction: West-South-West

HR1781 is a main-sequence star in the constellation of Orion.

HR1781 visual magnitude is 5.7. Because of its reltive faintness, HR1781 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 HR1781:

Color of HR1781 ⬤

Magnitude of HR1781 5.7

Class Main-sequence

VISIBILITY RIGHT NOW

HR1781 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 15.6°
Azimuth: 249.1°
Direction: West-South-West

Celestial coordinates and finder chart of HR1781

HR1781 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 HR1781 are provided in the following table:

Right Ascension J2000 05h 23m 42s

Declination J2000 -00° 09’ 34”

Galactic Longitude 202.68°

Galactic Latitude -19.49°

Constellation Orion

The simplified sky map below shows the position of HR1781 in the sky:

Simplified finder chart for HR1781.

Visibility of HR1781 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 HR1781 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: 90.2° RISE 18:40

Max altitude: 38.4° TRANSIT 0:41

Azimuth: 269.8° SET 6:38

Digitized Sky Survey image of HR1781

The image below is a photograph of HR1781 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 HR1781 is -0.009 arcsec per year in Right Ascension and 0.003 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

DSS2 image of HR1781. The red arrow shows the motion of HR1781 during the next 100000 years (-15.00 arcmin in Right Ascension and 5.00 arcmin in declination);

Distance of HR1781 from the Sun and relative movement

HR1781 is distant 808.93 light years from the Sun and it is moving far from the Sun at the speed of 22 kilometers per second.

Distance (parsec) 248.14 pc

Distance (light year) 808.93 ly

Heliocentric radial velocity 22 km/s

Proper Motion RA -0.009 arcsec/year

Proper Motion Dec 0.003 arcsec/year

Spectral properties of HR1781

HR1781 belongs to spectral class B1 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude -1.27

Spectral Type B1V

Color Index (B-V) -0.21

Temperature of HR1781 13831K

The red dot in the diagram below shows where HR1781 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR1781. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR1781

Henry Draper Catalogue HD35299

SAO Catalogue SAO132057

Hipparcos Catalogue HIP25223

Durchmusterung Catalogue BD-00 936

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In Evidence

Other stars in Orion