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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: 7:37  
clear_day Transit: 11:46  
SunsetSet: 15:55 south
sunny DaytimeWhat's Visible Now?
All Constellations » Taurus » 


Altitude: -36.8°   Azimuth: 16.5°   Direction: North-North-East

HR1099 is a variable and double main-sequence star in the constellation of Taurus.

HR1099 visual magnitude is 5.71. Because of its reltive faintness, HR1099 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 HR1099:


HR1099 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -36.8°
Azimuth: 16.5°
Direction: North-North-East

Celestial coordinates and finder chart of HR1099

HR1099 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 HR1099 are provided in the following table:

03h 36m 47s
+00° 35’ 16”

The simplified sky map below shows the position of HR1099 in the sky:

Finder chart HR1099 star
Simplified finder chart for HR1099.

Visibility of HR1099 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 HR1099 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: 89.4°
Max altitude: 39.1°
Azimuth: 270.6°

Digitized Sky Survey image of HR1099

The image below is a photograph of HR1099 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 HR1099 is -0.026 arcsec per year in Right Ascension and -0.164 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of HR1099 star
DSS2 image of HR1099. The red arrow shows the motion of HR1099 during the next 1000 years (-0.43 arcmin in Right Ascension and -2.73 arcmin in declination);

Distance of HR1099 from the Sun and relative movement

HR1099 is distant 94.44 light years from the Sun and it is moving towards the Sun at the speed of 23 kilometers per second.

28.97 pc
94.44 ly
-23 km/s
-0.026 arcsec/year
-0.164 arcsec/year

Spectral properties of HR1099

HR1099 belongs to spectral class G9 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR1099 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR1099. Attribution: Richard Powell / CC BY-SA

HR1099 star system properties

HR1099 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 HR1099 double sysyem:

6.6 arcsec

Alternative designations of HR1099