HR638

HR638 is a main-sequence star in the constellation of Cetus.

HR638 visual magnitude is 6.01. Because of its reltive faintness, HR638 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 HR638:

Color of HR638 ⬤

Magnitude of HR638 6.01

Class Main-sequence

VISIBILITY RIGHT NOW HR638 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Celestial coordinates and finder chart of HR638

HR638 is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR638 are provided in the following table:

Right Ascension J2000 02h 11m 22s

Declination J2000 -10° 03’ 07”

Galactic Longitude 174.54°

Galactic Latitude -64.57°

Constellation Cetus

The simplified sky map below shows the position of HR638 in the sky:

Simplified finder chart for HR638.

Visibility of HR638 from your location

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

Today's HR638 rise, transit and set times from Greenwich, United Kingdom edit_location_alt are the following (all times relative to the local timezone Europe/London):

Azimuth: 100.1° RISE 5:26

Max altitude: 28.5° TRANSIT 10:32

Azimuth: 259.9° SET 15:39

RIGHT NOW HR638 is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of HR638

The image below is a photograph of HR638 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 HR638 is -0.022 arcsec per year in Right Ascension and -0.166 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

DSS2 image of HR638. The red arrow shows the motion of HR638 during the next 1000 years (-0.37 arcmin in Right Ascension and -2.77 arcmin in declination);

Distance of HR638 from the Sun and relative movement

HR638 is distant 163.00 light years from the Sun and it is moving far from the Sun at the speed of 11 kilometers per second.

Distance (parsec) 50.00 pc

Distance (light year) 163.00 ly

Heliocentric radial velocity 11 km/s

Proper Motion RA -0.022 arcsec/year

Proper Motion Dec -0.166 arcsec/year

Spectral properties of HR638

HR638 belongs to spectral class F5 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude 2.52

Spectral Type F5V

Color Index (B-V) 0.39

Temperature of HR638 6934K

The red dot in the diagram below shows where HR638 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR638. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR638

Henry Draper Catalogue HD13456

SAO Catalogue SAO148262

Hipparcos Catalogue HIP10215

Durchmusterung Catalogue BD-10 447

FK5 Catalogue 2150

In Evidence

Other stars in Cetus