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: 7:04  
clear_day Transit: 12:47  
SunsetSet: 18:30 south
sunny DaytimeWhat's Visible Now
All Constellations » Auriga » 


Altitude: 9.7°   Azimuth: 334.2°   Direction: North-North-West

HR1644 is a bright giant star in the constellation of Auriga.

HR1644 visual magnitude is 6.2. Because of its reltive faintness, HR1644 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 HR1644:

Bright giant

HR1644 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 9.7°
Azimuth: 334.2°
Direction: North-North-West

Celestial coordinates and finder chart of HR1644

HR1644 is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR1644 are provided in the following table:

05h 06m 49s
+43° 10’ 28”

The simplified sky map below shows the position of HR1644 in the sky:

Finder chart HR1644 star
Simplified finder chart for HR1644.

Visibility of HR1644 from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

HR1644 is circumpolar and transits at 04:16 UTC (altitude: 81.7°)

Digitized Sky Survey image of HR1644

The image below is a photograph of HR1644 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 HR1644 is 0.005 arcsec per year in Right Ascension and 0 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of HR1644 star
DSS2 image of HR1644. The red arrow shows the motion of HR1644 during the next 100000 years (8.33 arcmin in Right Ascension and 0.00 arcmin in declination);

Distance of HR1644 from the Sun and relative movement

HR1644 is distant 860.16 light years from the Sun and it is moving towards the Sun at the speed of 14 kilometers per second.

263.85 pc
860.16 ly
-14 km/s
0.005 arcsec/year

Spectral properties of HR1644

HR1644 belongs to spectral class F2 and has a luminosity class of II corresponding to a bright giant star.


The red dot in the diagram below shows where HR1644 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR1644. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR1644