HR4157

Altitude: 3.8° Azimuth: 143.7° Direction: South-East

HR4157 is a variable and double main-sequence star in the constellation of Hydra.

HR4157 visual magnitude is 6.29. Because of its reltive faintness, HR4157 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 HR4157:

Color of HR4157 ⬤

Magnitude of HR4157 6.29

Class Main-sequence

VISIBILITY RIGHT NOW

HR4157 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 3.8°
Azimuth: 143.7°
Direction: South-East

Celestial coordinates and finder chart of HR4157

HR4157 is situated south of the celestial equator, as such, it is more easily visible from the southern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR4157 are provided in the following table:

Right Ascension J2000 10h 36m 04s

Declination J2000 -26° 40’ 30”

Galactic Longitude 268.94°

Galactic Latitude 27.12°

Constellation Hydra

The simplified sky map below shows the position of HR4157 in the sky:

Simplified finder chart for HR4157.

Visibility of HR4157 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 HR4157 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: 116.7° RISE 2:02

Max altitude: 11.8° TRANSIT 5:25

Azimuth: 243.3° SET 8:47

Digitized Sky Survey image of HR4157

The image below is a photograph of HR4157 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 HR4157 is 0.009 arcsec per year in Right Ascension and -0.062 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of HR4157. The red arrow shows the motion of HR4157 during the next 10000 years (1.50 arcmin in Right Ascension and -10.33 arcmin in declination);

Distance of HR4157 from the Sun and relative movement

HR4157 is distant 143.49 light years from the Sun and it is moving towards the Sun at the speed of 23 kilometers per second.

Distance (parsec) 44.01 pc

Distance (light year) 143.49 ly

Heliocentric radial velocity -23 km/s

Proper Motion RA 0.009 arcsec/year

Proper Motion Dec -0.062 arcsec/year

Spectral properties of HR4157

HR4157 belongs to spectral class F5 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude 3.07

Spectral Type F5V

Color Index (B-V) 0.48

Temperature of HR4157 6481K

The red dot in the diagram below shows where HR4157 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR4157. Attribution: Richard Powell / CC BY-SA

HR4157 star system properties

HR4157 is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the HR4157 double sysyem:

Main star magnitude 6.29

Secondary star magnitude 7.29

Magnitude difference 1

Separation 1 arcsec

Alternative designations of HR4157

Henry Draper Catalogue HD91881

SAO Catalogue SAO179014

Hipparcos Catalogue HIP51885

Durchmusterung Catalogue CD-26 8022

General Catalogue of Variable Stars 4907

Aitken Double Star Catalogue ADS7846

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In Evidence

Other stars in Hydra