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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
north SunriseRise: 7:43  
clear_day Transit: 11:47  
SunsetSet: 15:52 south
sunny DaytimeWhat's Visible Now?
All Constellations » Carina » 


Altitude: -49.0°   Azimuth: 225.0°   Direction: South-West

HR3999 is a variable giant star in the constellation of Carina.

HR3999 visual magnitude is 5.6. Because of its reltive faintness, HR3999 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 HR3999:


HR3999 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -49.0°
Azimuth: 225.0°
Direction: South-West

Celestial coordinates and finder chart of HR3999

HR3999 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 HR3999 are provided in the following table:

10h 09m 21s
-61° 32’ 57”

The simplified sky map below shows the position of HR3999 in the sky:

Finder chart HR3999 star
Simplified finder chart for HR3999.

Visibility of HR3999 from your location

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

HR3999 is currently not visible from Greenwich, United Kingdom edit_location_alt

Digitized Sky Survey image of HR3999

The image below is a photograph of HR3999 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 HR3999 is -0.094 arcsec per year in Right Ascension and 0.073 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of HR3999 star
DSS2 image of HR3999. The red arrow shows the motion of HR3999 during the next 1000 years (-1.57 arcmin in Right Ascension and 1.22 arcmin in declination);

Distance of HR3999 from the Sun and relative movement

HR3999 is distant 1,319.84 light years from the Sun and it is moving far from the Sun at the speed of 289 kilometers per second.

404.86 pc
1,319.84 ly
289 km/s
-0.094 arcsec/year
0.073 arcsec/year

Spectral properties of HR3999

HR3999 belongs to spectral class M2 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR3999 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR3999. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR3999