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: 7:04  
clear_day Transit: 12:47  
SunsetSet: 18:30 south
sunny DaytimeWhat's Visible Now
All Constellations » Hercules » 

99 Herculis

Altitude: 39.9°   Azimuth: 89.2°   Direction: East

99 Herculis is a multiple main-sequence star in the constellation of Hercules.

99 Herculis visual magnitude is 5.04. Because of its reltive faintness, 99 Herculis 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 99 Herculis:


99 Herculis is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 39.9°
Azimuth: 89.2°
Direction: East

Celestial coordinates and finder chart of 99 Herculis

99 Herculis is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of 99 Herculis are provided in the following table:

18h 07m 01s
+30° 33’ 42”

The simplified sky map below shows the position of 99 Herculis in the sky:

Finder chart 99 Herculis star
Simplified finder chart for 99 Herculis.

Visibility of 99 Herculis 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 99 Herculis 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: 59.4°
Max altitude: 69.1°
Azimuth: 300.6°

Digitized Sky Survey image of 99 Herculis

The image below is a photograph of 99 Herculis 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 99 Herculis is -0.094 arcsec per year in Right Ascension and 0.071 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 99 Herculis star
DSS2 image of 99 Herculis. The red arrow shows the motion of 99 Herculis during the next 1000 years (-1.57 arcmin in Right Ascension and 1.18 arcmin in declination);

Distance of 99 Herculis from the Sun and relative movement

99 Herculis is distant 51.03 light years from the Sun and it is moving far from the Sun at the speed of 1 kilometers per second.

15.65 pc
51.03 ly
1 km/s
-0.094 arcsec/year
0.071 arcsec/year

Spectral properties of 99 Herculis

99 Herculis belongs to spectral class F7 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where 99 Herculis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 99 Herculis. Attribution: Richard Powell / CC BY-SA

99 Herculis star system properties

99 Herculis is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the 99 Herculis double sysyem:

1.7 arcsec

Alternative designations of 99 Herculis

99 Herculis
Gl 704 A