Your guide to the Solar System and the night sky
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🌎  Greenwich, United Kingdom [change]

HR6645

HR6645 is a double hypergiant star in the constellation of Scorpius.

HR6645 visual magnitude is 6.66. Because of its reltive faintness, HR6645 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 HR6645:

6.66
Hypergiant
HR6645 is below the horizon from Greenwich, United Kingdom [change].

Celestial coordinates and finder chart of HR6645

HR6645 is situated south of the celestial equator, as such, it is more easily visible from the southern emisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR6645 are provided in the following table:

17h 51m 12s
-30° 33’ 25”
359.24°
-1.88°
Scorpius

The simplified sky map below shows the position of HR6645 in the sky:

Finder chart HR6645 star
Simplified finder chart for HR6645.

Visibility of HR6645 from your location

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's HR6645 rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 120.6°
Max altitude: 8.0°
Azimuth: 239.4°
HR6645 is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of HR6645

The image below is a photograph of HR6645 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 HR6645 is 0.002 arcsec per year in Right Ascension and -0.011 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR6645 star
DSS2 image of HR6645. The red arrow shows the motion of HR6645 during the next 10000 years (0.33 arcmin in Right Ascension and -1.83 arcmin in declination);

Distance of HR6645 from the Sun and relative movement

HR6645 is distant 684.87 light years from the Sun and it is moving towards the Sun at the speed of 9 kilometers per second.

210.08 pc
684.87 ly
-9 km/s
0.002 arcsec/year
-0.011 arcsec/year

Spectral properties of HR6645

HR6645 belongs to spectral class A0 and has a luminosity class of V corresponding to a hypergiant star.

0.05
A0V
9652K

The red dot in the diagram below shows where HR6645 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR6645. Attribution: Richard Powell / CC BY-SA

HR6645 star system properties

HR6645 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 HR6645 double sysyem:

6.66
8.16
1.5
10.2 arcsec

Alternative designations of HR6645

SAO209357
SAO209357