HR4550

HR4550 is a variable and double main-sequence star in the constellation of Ursa Major.

HR4550 visual magnitude is 6.45. Because of its reltive faintness, HR4550 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 HR4550:

Color of HR4550 ⬤

Magnitude of HR4550 6.45

Class Main-sequence

VISIBILITY RIGHT NOW HR4550 is above the horizon from Greenwich, United Kingdom [change]. Altitude: 21°.

Celestial coordinates and finder chart of HR4550

HR4550 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 HR4550 are provided in the following table:

Right Ascension J2000 11h 52m 58s

Declination J2000 +37° 43’ 06”

Galactic Longitude 168.42°

Galactic Latitude 73.69°

Constellation Ursa Major

The simplified sky map below shows the position of HR4550 in the sky:

Simplified finder chart for HR4550.

Visibility of HR4550 from your location

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

Today's HR4550 rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 52.3° RISE 13:26

Max altitude: 76.2° TRANSIT 0:28

Azimuth: 307.7° SET 11:34

RIGHT NOW HR4550 is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of HR4550

The image below is a photograph of HR4550 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 HR4550 is 4.003 arcsec per year in Right Ascension and -5.813 arcsec per year in Declination and the associated displacement for the next 100 years is represented with the red arrow.

DSS2 image of HR4550. The red arrow shows the motion of HR4550 during the next 100 years (6.67 arcmin in Right Ascension and -9.69 arcmin in declination);

Distance of HR4550 from the Sun and relative movement

HR4550 is distant 29.85 light years from the Sun and it is moving towards the Sun at the speed of 98 kilometers per second.

Distance (parsec) 9.16 pc

Distance (light year) 29.85 ly

Heliocentric radial velocity -98 km/s

Proper Motion RA 4.003 arcsec/year

Proper Motion Dec -5.813 arcsec/year

Spectral properties of HR4550

HR4550 belongs to spectral class G8 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude 6.64

Spectral Type G8V

Color Index (B-V) 0.75

Temperature of HR4550 5436K

The red dot in the diagram below shows where HR4550 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR4550. Attribution: Richard Powell / CC BY-SA

HR4550 star system properties

HR4550 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 HR4550 double sysyem:

Main star magnitude 6.45

Secondary star magnitude 11.95

Magnitude difference 5.5

Separation 1.7 arcsec

Alternative designations of HR4550

Henry Draper Catalogue HD103095

SAO Catalogue SAO62738

Hipparcos Catalogue HIP57939

Durchmusterung Catalogue BD+38 2285

Gliese Catalogue Gl 451 A

FK5 Catalogue 1307

General Catalogue of Variable Stars CF UMa

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Other stars in Ursa Major