Your guide to the Solar System and the night sky
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🌎  Observing from: Greenwich, United Kingdom [change]
🌅 Sunrise: 6:38  ☀️ Transit: 13:03  🌅 Sunset: 19:28


HR3878 is a hypergiant star in the constellation of Antlia.

HR3878 visual magnitude is 6.45. Because of its reltive faintness, HR3878 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 HR3878:

HR3878 is above the horizon from Greenwich, United Kingdom [change]. Altitude: 2°.

Celestial coordinates and finder chart of HR3878

HR3878 is situated south of the celestial equator, as such, it is more easily visible from the southern emisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR3878 are provided in the following table:

09h 45m 21s
-30° 12’ 10”

The simplified sky map below shows the position of HR3878 in the sky:

Finder chart HR3878 star
Simplified finder chart for HR3878.

Visibility of HR3878 from your location

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

Today's HR3878 rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 120.2°
Max altitude: 8.3°
Azimuth: 239.8°
HR3878 is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of HR3878

The image below is a photograph of HR3878 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 HR3878 is -0.032 arcsec per year in Right Ascension and 0.001 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR3878 star
DSS2 image of HR3878. The red arrow shows the motion of HR3878 during the next 10000 years (-5.33 arcmin in Right Ascension and 0.17 arcmin in declination);

Distance of HR3878 from the Sun and relative movement

HR3878 is distant 8,358.97 light years from the Sun and it is moving far from the Sun at the speed of 33 kilometers per second.

2,564.10 pc
8,358.97 ly
33 km/s
-0.032 arcsec/year
0.001 arcsec/year

Spectral properties of HR3878

HR3878 belongs to spectral class B0 and has a luminosity class of III corresponding to a hypergiant star.


The red dot in the diagram below shows where HR3878 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR3878. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR3878