HR1691

Altitude: 3.1° Azimuth: 267.8° Direction: West

HR1691 is a double giant star in the constellation of Orion.

HR1691 visual magnitude is 5.89. Because of its reltive faintness, HR1691 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 HR1691:

Color of HR1691 ⬤

Magnitude of HR1691 5.89

Class Giant

VISIBILITY RIGHT NOW

HR1691 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 3.1°
Azimuth: 267.8°
Direction: West

Celestial coordinates and finder chart of HR1691

HR1691 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 HR1691 are provided in the following table:

Right Ascension J2000 05h 11m 45s

Declination J2000 +01° 02’ 12”

Galactic Longitude 200°

Galactic Latitude -21.51°

Constellation Orion

The simplified sky map below shows the position of HR1691 in the sky:

Simplified finder chart for HR1691.

Visibility of HR1691 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 HR1691 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: 89.0° RISE 23:53

Max altitude: 39.6° TRANSIT 6:00

Azimuth: 271.0° SET 12:03

Digitized Sky Survey image of HR1691

The image below is a photograph of HR1691 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 HR1691 is -0.012 arcsec per year in Right Ascension and -0.015 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of HR1691. The red arrow shows the motion of HR1691 during the next 10000 years (-2.00 arcmin in Right Ascension and -2.50 arcmin in declination);

Distance of HR1691 from the Sun and relative movement

HR1691 is distant 915.73 light years from the Sun and it is moving towards the Sun at the speed of 19 kilometers per second.

Distance (parsec) 280.90 pc

Distance (light year) 915.73 ly

Heliocentric radial velocity -19 km/s

Proper Motion RA -0.012 arcsec/year

Proper Motion Dec -0.015 arcsec/year

Spectral properties of HR1691

HR1691 belongs to spectral class G5 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude -1.35

Spectral Type G5III

Color Index (B-V) 0.66

Temperature of HR1691 5742K

The red dot in the diagram below shows where HR1691 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR1691. Attribution: Richard Powell / CC BY-SA

HR1691 star system properties

HR1691 is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the HR1691 double sysyem:

Main star magnitude 5.89

Secondary star magnitude 7.29

Magnitude difference 1.4

Separation 1.6 arcsec

Alternative designations of HR1691

Henry Draper Catalogue HD33646

SAO Catalogue SAO112509

Hipparcos Catalogue HIP24203

Durchmusterung Catalogue BD+00 975

Aitken Double Star Catalogue ADS3764

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In Evidence

Other stars in Orion