Your guide to the Solar System and the night sky
Please donate now to help keep TheSkyLive ads-free. This site cannot run without your voluntary donations.
🌎  Greenwich, United Kingdom [change]


HR4645 is a variable supergiant star in the constellation of Musca.

HR4645 visual magnitude is 6.17. Because of its reltive faintness, HR4645 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 HR4645:

HR4645 is below the horizon from Greenwich, United Kingdom [change].

Celestial coordinates and finder chart of HR4645

HR4645 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 HR4645 are provided in the following table:

12h 12m 46s
-70° 09’ 06”

The simplified sky map below shows the position of HR4645 in the sky:

Finder chart HR4645 star
Simplified finder chart for HR4645.

Visibility of HR4645 from your location

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

HR4645 is currently not visible from Greenwich, United Kingdom [change]

Digitized Sky Survey image of HR4645

The image below is a photograph of HR4645 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 HR4645 is -0.022 arcsec per year in Right Ascension and -0.009 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR4645 star
DSS2 image of HR4645. The red arrow shows the motion of HR4645 during the next 10000 years (-3.67 arcmin in Right Ascension and -1.50 arcmin in declination);

Distance of HR4645 from the Sun and relative movement

HR4645 is distant 1,630.00 light years from the Sun and it is moving far from the Sun at the speed of 11 kilometers per second.

500.00 pc
1,630.00 ly
11 km/s
-0.022 arcsec/year
-0.009 arcsec/year

Spectral properties of HR4645

HR4645 belongs to spectral class F6 and has a luminosity class of I corresponding to a supergiant star.


The red dot in the diagram below shows where HR4645 is situated in the HertzsprungÔÇôRussell diagram.

HR Diagram
H-R diagram showing the position of HR4645. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR4645