HR3870

HR3870 is a variable giant star in the constellation of Ursa Major.

HR3870 visual magnitude is 5.2. Because of its reltive faintness, HR3870 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 HR3870:

Color of HR3870 ⬤

Magnitude of HR3870 5.2

Class Giant

VISIBILITY RIGHT NOW HR3870 is above the horizon from Greenwich, United Kingdom [change]. Altitude: 44°.

Celestial coordinates and finder chart of HR3870

HR3870 is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR3870 are provided in the following table:

Right Ascension J2000 09h 46m 31s

Declination J2000 +57° 07’ 41”

Galactic Longitude 157.15°

Galactic Latitude 45.82°

Constellation Ursa Major

The simplified sky map below shows the position of HR3870 in the sky:

Simplified finder chart for HR3870.

Visibility of HR3870 from your location

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

HR3870 is circumpolar and transits at 21:45 UTC (altitude: 84.4°)

Digitized Sky Survey image of HR3870

The image below is a photograph of HR3870 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 HR3870 is 0.004 arcsec per year in Right Ascension and 0.034 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of HR3870. The red arrow shows the motion of HR3870 during the next 10000 years (0.67 arcmin in Right Ascension and 5.67 arcmin in declination);

Distance of HR3870 from the Sun and relative movement

HR3870 is distant 556.31 light years from the Sun and it is moving far from the Sun at the speed of 8 kilometers per second.

Distance (parsec) 170.65 pc

Distance (light year) 556.31 ly

Heliocentric radial velocity 8 km/s

Proper Motion RA 0.004 arcsec/year

Proper Motion Dec 0.034 arcsec/year

Spectral properties of HR3870

HR3870 belongs to spectral class M3 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude -0.96

Spectral Type M3III

Color Index (B-V) 1.62

Temperature of HR3870 3622K

The red dot in the diagram below shows where HR3870 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR3870. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR3870

Henry Draper Catalogue HD84335

SAO Catalogue SAO27377

Hipparcos Catalogue HIP47965

Durchmusterung Catalogue BD+57 1231

General Catalogue of Variable Stars CS UMa

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In Evidence

Other stars in Ursa Major