HR3638

Altitude: -31.7° Azimuth: 280.5° Direction: West

HR3638 is a main-sequence star in the constellation of Hydra.

HR3638 visual magnitude is 5.73. Because of its reltive faintness, HR3638 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 HR3638:

Color of HR3638 ⬤

Magnitude of HR3638 5.73

Class Main-sequence

VISIBILITY RIGHT NOW

HR3638 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -31.7°
Azimuth: 280.5°
Direction: West

Celestial coordinates and finder chart of HR3638

HR3638 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 HR3638 are provided in the following table:

Right Ascension J2000 09h 09m 04s

Declination J2000 -18° 19’ 42”

Galactic Longitude 246.74°

Galactic Latitude 19.51°

Constellation Hydra

The simplified sky map below shows the position of HR3638 in the sky:

Simplified finder chart for HR3638.

Visibility of HR3638 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 HR3638 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: 108.3° RISE 23:34

Max altitude: 20.2° TRANSIT 3:58

Azimuth: 251.7° SET 8:18

Digitized Sky Survey image of HR3638

The image below is a photograph of HR3638 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 HR3638 is -0.052 arcsec per year in Right Ascension and 0.009 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of HR3638. The red arrow shows the motion of HR3638 during the next 10000 years (-8.67 arcmin in Right Ascension and 1.50 arcmin in declination);

Distance of HR3638 from the Sun and relative movement

HR3638 is distant 260.38 light years from the Sun and it is moving far from the Sun at the speed of 17 kilometers per second.

Distance (parsec) 79.87 pc

Distance (light year) 260.38 ly

Heliocentric radial velocity 17 km/s

Proper Motion RA -0.052 arcsec/year

Proper Motion Dec 0.009 arcsec/year

Spectral properties of HR3638

HR3638 belongs to spectral class A2 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude 1.22

Spectral Type A2V

Color Index (B-V) 0

Temperature of HR3638 10125K

The red dot in the diagram below shows where HR3638 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR3638. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR3638

Henry Draper Catalogue HD78702

SAO Catalogue SAO154950

Hipparcos Catalogue HIP44923

Durchmusterung Catalogue BD-17 2765

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In Evidence

Other stars in Hydra