15 Hydrae

Altitude: 2.7° Azimuth: 255.0° Direction: West-South-West

15 Hydrae is a variable and multiple star in the constellation of Hydra.

15 Hydrae visual magnitude is 5.54. Because of its reltive faintness, 15 Hydrae 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 15 Hydrae:

Color of 15 Hydrae ⬤

Magnitude of 15 Hydrae 5.54

Class

VISIBILITY RIGHT NOW

15 Hydrae is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 2.7°
Azimuth: 255.0°
Direction: West-South-West

Celestial coordinates and finder chart of 15 Hydrae

15 Hydrae 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 15 Hydrae are provided in the following table:

Right Ascension J2000 08h 51m 34s

Declination J2000 -07° 10’ 37”

Galactic Longitude 234.39°

Galactic Latitude 22.64°

Constellation Hydra

The simplified sky map below shows the position of 15 Hydrae in the sky:

Simplified finder chart for 15 Hydrae.

Visibility of 15 Hydrae 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 15 Hydrae 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: 97.2° RISE 4:02

Max altitude: 31.3° TRANSIT 9:24

Azimuth: 262.8° SET 14:45

Digitized Sky Survey image of 15 Hydrae

The image below is a photograph of 15 Hydrae 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 15 Hydrae is -0.044 arcsec per year in Right Ascension and 0.001 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of 15 Hydrae. The red arrow shows the motion of 15 Hydrae during the next 10000 years (-7.33 arcmin in Right Ascension and 0.17 arcmin in declination);

Distance of 15 Hydrae from the Sun and relative movement

15 Hydrae is distant 488.02 light years from the Sun and it is moving far from the Sun at the speed of 37 kilometers per second.

Distance (parsec) 149.70 pc

Distance (light year) 488.02 ly

Heliocentric radial velocity 37 km/s

Proper Motion RA -0.044 arcsec/year

Proper Motion Dec 0.001 arcsec/year

Spectral properties of 15 Hydrae

15 Hydrae belongs to spectral class A4

Absolute magnitude -0.34

Spectral Type A4

Color Index (B-V) 0.15

Temperature of 15 Hydrae 8571K

The red dot in the diagram below shows where 15 Hydrae is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 15 Hydrae. Attribution: Richard Powell / CC BY-SA

15 Hydrae star system properties

15 Hydrae is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the 15 Hydrae double sysyem:

Main star magnitude 5.54

Secondary star magnitude 7.34

Magnitude difference 1.8

Separation 0.9 arcsec

Alternative designations of 15 Hydrae

Flamsteed designation 15 Hydrae

Henry Draper Catalogue HD75737

SAO Catalogue SAO136345

Hipparcos Catalogue HIP43496

Durchmusterung Catalogue BD-06 2743

General Catalogue of Variable Stars 4282

Aitken Double Star Catalogue ADS7050

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