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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 6:48  
clear_day Transit: 12:11  
SunsetSet: 17:34
wb_twilight Astronomical TwilightWhat's Visible Now?
All Constellations » Cetus » 


Altitude: -49.2°   Azimuth: 64.8°   Direction: East-North-East

HR251 is a double sub-giant star in the constellation of Cetus.

HR251 visual magnitude is 6.46. Because of its reltive faintness, HR251 should be visible only from locations with dark skies, while it is not visible at all from skies affected by light pollution.

The proper motion of HR251 is 0.098 arcsec per year in Right Ascension and 0.037 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of HR251 star
DSS2 image of HR251. The red arrow shows the motion of HR251 during the next 1000 years (1.63 arcmin in Right Ascension and 0.62 arcmin in declination);

Key facts about HR251


HR251 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -49.2°
Azimuth: 64.8°
Direction: East-North-East

Celestial coordinates and finder chart of HR251

HR251 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 HR251 are provided in the following table:

00h 53m 12s
-24° 46’ 36”

The simplified sky map below shows the position of HR251 in the sky:

Finder chart HR251 star
Simplified finder chart for HR251.

Visibility of HR251 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 HR251 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: 114.8°
Max altitude: 13.7°
Azimuth: 245.2°

Distance of HR251 from the Sun and relative movement

HR251 is distant 242.74 light years from the Sun and it is moving towards the Sun at the speed of 4 kilometers per second.

74.46 pc
242.74 ly
-4 km/s
0.098 arcsec/year
0.037 arcsec/year

Spectral properties of HR251

HR251 belongs to spectral class F6 and has a luminosity class of IV corresponding to a sub-giant star.


The red dot in the diagram below shows where HR251 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR251. Attribution: Richard Powell / CC BY-SA

HR251 star system properties

HR251 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 HR251 double sysyem:

5.4 arcsec

Alternative designations of HR251