99 Herculis

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:

Color of 99 Herculis ⬤

Magnitude of 99 Herculis 5.04

Class Main-sequence

VISIBILITY RIGHT NOW 99 Herculis is above the horizon from Greenwich, United Kingdom [change]. Altitude: 3°.

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:

Right Ascension J2000 18h 07m 01s

Declination J2000 +30° 33’ 42”

Galactic Longitude 56.97°

Galactic Latitude 22.3°

Constellation Hercules

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

Simplified finder chart for 99 Herculis.

Visibility of 99 Herculis from your location

Location: Greenwich, United Kingdom [change]
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 [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 59.4° RISE 21:32

Max altitude: 69.1° TRANSIT 6:45

Azimuth: 300.6° SET 15:53

RIGHT NOW 99 Herculis is above the horizon from Greenwich, United Kingdom

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.

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.

Distance (parsec) 15.65 pc

Distance (light year) 51.03 ly

Heliocentric radial velocity 1 km/s

Proper Motion RA -0.094 arcsec/year

Proper Motion Dec 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.

Absolute magnitude 4.07

Spectral Type F7V

Color Index (B-V) 0.52

Temperature of 99 Herculis 6300K

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

Main star magnitude 5.04

Secondary star magnitude 8.44

Magnitude difference 3.4

Separation 1.7 arcsec

Alternative designations of 99 Herculis

Flamsteed designation 99 Herculis

Henry Draper Catalogue HD165908

SAO Catalogue SAO66648

Hipparcos Catalogue HIP88745

Durchmusterung Catalogue BD+30 3128

Gliese Catalogue Gl 704 A

Aitken Double Star Catalogue ADS11077

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In Evidence

Other stars in Hercules