Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:52  
clear_day Transit: 12:55  
SunsetSet: 20:59 south
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All Constellations » Puppis » 

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:

6.35
Hypergiant
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:

06h 04m 28s
-45° 02’ 12”
252.13°
-26.78°
Puppis

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

Finder chart HR2157 star
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.

Image of HR2157 star
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.

26.70 pc
87.03 ly
26 km/s
-0.08 arcsec/year
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.

4.22
G0IV
6300K

The red dot in the diagram below shows where HR2157 is situated in the Hertzsprungā€“Russell diagram.

HR 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:

6.35
6.65
0.3
196.7 arcsec

Alternative designations of HR2157

SAO217702
SAO217702