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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: 5:51  
clear_day Transit: 12:57  
SunsetSet: 20:04
sunny DaytimeWhat's Visible Now?
All Constellations » Vela » 

HR3817

Altitude: -13.9°   Azimuth: 159.5°   Direction: South-South-East

HR3817 is a double sub-giant star in the constellation of Vela.

HR3817 visual magnitude is 5.12. Because of its reltive faintness, HR3817 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 HR3817 is -0.016 arcsec per year in Right Ascension and 0.01 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR3817 star
DSS2 image of HR3817. The red arrow shows the motion of HR3817 during the next 10000 years (-2.67 arcmin in Right Ascension and 1.67 arcmin in declination);

Key facts about HR3817

5.12
Sub-giant

HR3817 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -13.9°
Azimuth: 159.5°
Direction: South-South-East

Celestial coordinates and finder chart of HR3817

HR3817 is situated south of the celestial equator, as such, it is more easily visible from the southern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR3817 are provided in the following table:

09h 33m 44s
-49° 00’ 18”
273.03°
2.04°
Vela

The simplified sky map below shows the position of HR3817 in the sky:

Finder chart HR3817 star
Simplified finder chart for HR3817.

Visibility of HR3817 from your location

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

HR3817 is currently not visible from Greenwich, United Kingdom edit_location_alt

Distance of HR3817 from the Sun and relative movement

HR3817 is distant 958.82 light years from the Sun and it is moving far from the Sun at the speed of 17 kilometers per second.

294.12 pc
958.82 ly
17 km/s
-0.016 arcsec/year
0.01 arcsec/year

Spectral properties of HR3817

HR3817 belongs to spectral class B4 and has a luminosity class of IV corresponding to a sub-giant star.

-2.22
B4IV
11920K

The red dot in the diagram below shows where HR3817 is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of HR3817. Attribution: Richard Powell / CC BY-SA

HR3817 star system properties

HR3817 is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the HR3817 double sysyem:

5.12
5.92
0.8
2.1 arcsec

Alternative designations of HR3817

SAO221288
SAO221288