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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
north SunriseRise: 7:54  
clear_day Transit: 11:51  
SunsetSet: 15:49 south
sunny DaytimeWhat's Visible Now?
All Constellations » Puppis » 


Altitude: -44.9°   Azimuth: 313.3°   Direction: North-West

HR2921 is a variable and multiple main-sequence star in the constellation of Puppis.

HR2921 visual magnitude is 5.7. Because of its reltive faintness, HR2921 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 HR2921:


HR2921 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -44.9°
Azimuth: 313.3°
Direction: North-West

Celestial coordinates and finder chart of HR2921

HR2921 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 HR2921 are provided in the following table:

07h 36m 03s
-14° 29’ 34”

The simplified sky map below shows the position of HR2921 in the sky:

Finder chart HR2921 star
Simplified finder chart for HR2921.

Visibility of HR2921 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 HR2921 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: 104.5°
Max altitude: 24.0°
Azimuth: 255.5°

Digitized Sky Survey image of HR2921

The image below is a photograph of HR2921 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 HR2921 is -0.01 arcsec per year in Right Ascension and 0.003 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR2921 star
DSS2 image of HR2921. The red arrow shows the motion of HR2921 during the next 10000 years (-1.67 arcmin in Right Ascension and 0.50 arcmin in declination);

Distance of HR2921 from the Sun and relative movement

HR2921 is distant 1,654.82 light years from the Sun and it is moving far from the Sun at the speed of 21 kilometers per second.

507.61 pc
1,654.82 ly
21 km/s
-0.01 arcsec/year
0.003 arcsec/year

Spectral properties of HR2921

HR2921 belongs to spectral class B2 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR2921 is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of HR2921. Attribution: Richard Powell / CC BY-SA

HR2921 star system properties

HR2921 is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the HR2921 double sysyem:

19.6 arcsec

Alternative designations of HR2921