Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 6:47  
clear_day Transit: 12:50  
SunsetSet: 18:52 south
sunny DaytimeWhat's Visible Now
All Constellations » Orion » 


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:


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:

05h 11m 45s
+01° 02’ 12”

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

Finder chart HR1691 star
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°
Max altitude: 39.6°
Azimuth: 271.0°

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.

Image of HR1691 star
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.

280.90 pc
915.73 ly
-19 km/s
-0.012 arcsec/year
-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.


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

HR 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:

1.6 arcsec

Alternative designations of HR1691