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 » Cetus » 


Altitude: -33.4°   Azimuth: 312.9°   Direction: North-West

HR684 is a main-sequence star in the constellation of Cetus.

HR684 visual magnitude is 6.5. Because of its reltive faintness, HR684 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 HR684:


HR684 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -33.4°
Azimuth: 312.9°
Direction: North-West

Celestial coordinates and finder chart of HR684

HR684 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 HR684 are provided in the following table:

02h 19m 40s
-04° 20’ 44”

The simplified sky map below shows the position of HR684 in the sky:

Finder chart HR684 star
Simplified finder chart for HR684.

Visibility of HR684 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 HR684 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: 94.3°
Max altitude: 34.2°
Azimuth: 265.7°

Digitized Sky Survey image of HR684

The image below is a photograph of HR684 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 HR684 is 0.041 arcsec per year in Right Ascension and 0.005 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR684 star
DSS2 image of HR684. The red arrow shows the motion of HR684 during the next 10000 years (6.83 arcmin in Right Ascension and 0.83 arcmin in declination);

Distance of HR684 from the Sun and relative movement

HR684 is distant 545.15 light years from the Sun and it is moving far from the Sun at the speed of 18 kilometers per second.

167.22 pc
545.15 ly
18 km/s
0.041 arcsec/year
0.005 arcsec/year

Spectral properties of HR684

HR684 belongs to spectral class A3 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR684 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR684. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR684