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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 6:59  
clear_day Transit: 12:12  
SunsetSet: 17:25
sleep NighttimeWhat's Visible Now?
All Constellations » Lepus » 


Altitude: -3.6°   Azimuth: 251.3°   Direction: West-South-West

HR1640 is a sub-giant star in the constellation of Lepus.

HR1640 visual magnitude is 6.41. Because of its reltive faintness, HR1640 should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The proper motion of HR1640 is -0.009 arcsec per year in Right Ascension and 0.033 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR1640 star
DSS2 image of HR1640. The red arrow shows the motion of HR1640 during the next 10000 years (-1.50 arcmin in Right Ascension and 5.50 arcmin in declination);

Key facts about HR1640


HR1640 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -3.6°
Azimuth: 251.3°
Direction: West-South-West

Celestial coordinates and finder chart of HR1640

HR1640 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 HR1640 are provided in the following table:

05h 03m 51s
-14° 22’ 09”

The simplified sky map below shows the position of HR1640 in the sky:

Finder chart HR1640 star
Simplified finder chart for HR1640.

Visibility of HR1640 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 HR1640 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: 104.4°
Max altitude: 24.2°
Azimuth: 255.6°

Distance of HR1640 from the Sun and relative movement

HR1640 is distant 1,319.84 light years from the Sun and it is moving far from the Sun at the speed of 16 kilometers per second.

404.86 pc
1,319.84 ly
16 km/s
-0.009 arcsec/year
0.033 arcsec/year

Spectral properties of HR1640

HR1640 belongs to spectral class B2 and has a luminosity class of IV corresponding to a sub-giant star.


The red dot in the diagram below shows where HR1640 is situated in the HertzsprungÔÇôRussell diagram.

HR Diagram
H-R diagram showing the position of HR1640. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR1640