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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: 6:52  
clear_day Transit: 12:11  
SunsetSet: 17:31
sunny DaytimeWhat's Visible Now?
All Constellations » Hydra » 


Altitude: -22.2°   Azimuth: 265.2°   Direction: West

HR4251 is a variable and multiple main-sequence star in the constellation of Hydra.

HR4251 visual magnitude is 5.24. Because of its reltive faintness, HR4251 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 HR4251 is 0.078 arcsec per year in Right Ascension and -0.239 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of HR4251 star
DSS2 image of HR4251. The red arrow shows the motion of HR4251 during the next 1000 years (1.30 arcmin in Right Ascension and -3.98 arcmin in declination);

Key facts about HR4251


HR4251 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -22.2°
Azimuth: 265.2°
Direction: West

Celestial coordinates and finder chart of HR4251

HR4251 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 HR4251 are provided in the following table:

10h 53m 29s
-20° 08’ 20”

The simplified sky map below shows the position of HR4251 in the sky:

Finder chart HR4251 star
Simplified finder chart for HR4251.

Visibility of HR4251 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 HR4251 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: 110.1°
Max altitude: 18.4°
Azimuth: 249.9°

Distance of HR4251 from the Sun and relative movement

HR4251 is distant 102.16 light years from the Sun and it is moving towards the Sun at the speed of 5 kilometers per second.

31.34 pc
102.16 ly
-5 km/s
0.078 arcsec/year
-0.239 arcsec/year

Spectral properties of HR4251

HR4251 belongs to spectral class F6 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where HR4251 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4251. Attribution: Richard Powell / CC BY-SA

HR4251 star system properties

HR4251 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 HR4251 double sysyem:

124.5 arcsec

Alternative designations of HR4251

Gl 403.1