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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: 7:44  
clear_day Transit: 11:48  
SunsetSet: 15:51 south
sleep NighttimeWhat's Visible Now?
All Constellations » Orion » 


Altitude: 33.7°   Azimuth: 161.4°   Direction: South-South-East

HR1900 is a variable and double sub-giant star in the constellation of Orion.

HR1900 visual magnitude is 6.4. Because of its reltive faintness, HR1900 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 HR1900:


HR1900 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 33.7°
Azimuth: 161.4°
Direction: South-South-East

Celestial coordinates and finder chart of HR1900

HR1900 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 HR1900 are provided in the following table:

05h 35m 35s
-03° 15’ 10”

The simplified sky map below shows the position of HR1900 in the sky:

Finder chart HR1900 star
Simplified finder chart for HR1900.

Visibility of HR1900 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 HR1900 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: 93.3°
Max altitude: 35.3°
Azimuth: 266.7°

Digitized Sky Survey image of HR1900

The image below is a photograph of HR1900 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 HR1900 is -0.008 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 HR1900 star
DSS2 image of HR1900. The red arrow shows the motion of HR1900 during the next 100000 years (-13.33 arcmin in Right Ascension and 0.00 arcmin in declination);

Distance of HR1900 from the Sun and relative movement

HR1900 is distant 2,608.00 light years from the Sun and it is moving far from the Sun at the speed of 24 kilometers per second.

800.00 pc
2,608.00 ly
24 km/s
-0.008 arcsec/year

Spectral properties of HR1900

HR1900 belongs to spectral class B3 and has a luminosity class of IV corresponding to a sub-giant star.


The red dot in the diagram below shows where HR1900 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR1900. Attribution: Richard Powell / CC BY-SA

HR1900 star system properties

HR1900 is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the HR1900 double sysyem:

1.1 arcsec

Alternative designations of HR1900