HR2157

HR2157 is a multiple hypergiant star in the constellation of Puppis.

HR2157 visual magnitude is 6.35. Because of its reltive faintness, HR2157 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 HR2157:

Color of HR2157 ⬤

Magnitude of HR2157 6.35

Class Hypergiant

VISIBILITY RIGHT NOW HR2157 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Celestial coordinates and finder chart of HR2157

HR2157 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 HR2157 are provided in the following table:

Right Ascension J2000 06h 04m 28s

Declination J2000 -45° 02’ 12”

Galactic Longitude 252.13°

Galactic Latitude -26.78°

Constellation Puppis

The simplified sky map below shows the position of HR2157 in the sky:

Simplified finder chart for HR2157.

Visibility of HR2157 from your location

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

HR2157 is currently not visible from Greenwich, United Kingdom edit_location_alt

Digitized Sky Survey image of HR2157

The image below is a photograph of HR2157 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 HR2157 is -0.08 arcsec per year in Right Ascension and 0.244 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

DSS2 image of HR2157. The red arrow shows the motion of HR2157 during the next 1000 years (-1.33 arcmin in Right Ascension and 4.07 arcmin in declination);

Distance of HR2157 from the Sun and relative movement

HR2157 is distant 87.03 light years from the Sun and it is moving far from the Sun at the speed of 26 kilometers per second.

Distance (parsec) 26.70 pc

Distance (light year) 87.03 ly

Heliocentric radial velocity 26 km/s

Proper Motion RA -0.08 arcsec/year

Proper Motion Dec 0.244 arcsec/year

Spectral properties of HR2157

HR2157 belongs to spectral class G0 and has a luminosity class of IV corresponding to a hypergiant star.

Absolute magnitude 4.22

Spectral Type G0IV

Color Index (B-V) 0.52

Temperature of HR2157 6300K

The red dot in the diagram below shows where HR2157 is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of HR2157. Attribution: Richard Powell / CC BY-SA

HR2157 star system properties

HR2157 is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the HR2157 double sysyem:

Main star magnitude 6.35

Secondary star magnitude 6.65

Magnitude difference 0.3

Separation 196.7 arcsec

Alternative designations of HR2157

Henry Draper Catalogue HD41700

SAO Catalogue SAO217702

Hipparcos Catalogue HIP28764

Durchmusterung Catalogue CD-45 2300

Gliese Catalogue Wo 9200

FK5 Catalogue 231

In Evidence

Other stars in Puppis