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: 6:55  
clear_day Transit: 12:49  
SunsetSet: 18:41 south
sleep NighttimeWhat's Visible Now
All Constellations » Delphinus » 


Altitude: 34.5°   Azimuth: 250.7°   Direction: West-South-West

HR7899 is a multiple main-sequence star in the constellation of Delphinus.

HR7899 visual magnitude is 5.97. Because of its reltive faintness, HR7899 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 HR7899:


HR7899 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 34.5°
Azimuth: 250.7°
Direction: West-South-West

Celestial coordinates and finder chart of HR7899

HR7899 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 HR7899 are provided in the following table:

20h 39m 05s
+15° 50’ 17”

The simplified sky map below shows the position of HR7899 in the sky:

Finder chart HR7899 star
Simplified finder chart for HR7899.

Visibility of HR7899 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 HR7899 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: 74.2°
Max altitude: 54.4°
Azimuth: 285.8°

Digitized Sky Survey image of HR7899

The image below is a photograph of HR7899 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 HR7899 is 0.001 arcsec per year in Right Ascension and -0.017 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR7899 star
DSS2 image of HR7899. The red arrow shows the motion of HR7899 during the next 10000 years (0.17 arcmin in Right Ascension and -2.83 arcmin in declination);

Distance of HR7899 from the Sun and relative movement

HR7899 is distant 1,298.80 light years from the Sun and it is moving far from the Sun at the speed of 2 kilometers per second.

398.41 pc
1,298.80 ly
2 km/s
0.001 arcsec/year
-0.017 arcsec/year

Spectral properties of HR7899

HR7899 belongs to spectral class B3 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR7899 is situated in the HertzsprungÔÇôRussell diagram.

HR Diagram
H-R diagram showing the position of HR7899. Attribution: Richard Powell / CC BY-SA

HR7899 star system properties

HR7899 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 HR7899 double sysyem:

22.5 arcsec

Alternative designations of HR7899