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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 6:04  
clear_day Transit: 12:06  
SunsetSet: 18:09
sunny DaytimeWhat's Visible Now?
All Constellations » Orion » 

HR1681

Altitude: -35.9°   Azimuth: 26.9°   Direction: North-North-East

HR1681 is a hypergiant star in the constellation of Orion.

HR1681 visual magnitude is 6.1. Because of its reltive faintness, HR1681 should be visible only from locations with dark skies, while it is not visible at all from skies affected by light pollution.

The proper motion of HR1681 is 0.001 arcsec per year in Right Ascension and -0.053 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR1681 star
DSS2 image of HR1681. The red arrow shows the motion of HR1681 during the next 10000 years (0.17 arcmin in Right Ascension and -8.83 arcmin in declination);

Key facts about HR1681

6.1
Hypergiant

HR1681 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -35.9°
Azimuth: 26.9°
Direction: North-North-East

Celestial coordinates and finder chart of HR1681

HR1681 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 HR1681 are provided in the following table:

05h 10m 03s
-00° 33’ 55”
201.28°
-22.67°
Orion

The simplified sky map below shows the position of HR1681 in the sky:

Finder chart HR1681 star
Simplified finder chart for HR1681.

Visibility of HR1681 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 HR1681 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: 90.6°
Max altitude: 38.0°
Azimuth: 269.4°

Distance of HR1681 from the Sun and relative movement

HR1681 is distant 314.37 light years from the Sun and it is moving far from the Sun at the speed of 26 kilometers per second.

96.43 pc
314.37 ly
26 km/s
0.001 arcsec/year
-0.053 arcsec/year

Spectral properties of HR1681

HR1681 belongs to spectral class K0 and has a luminosity class of III corresponding to a hypergiant star.

1.18
K0III
4515K

The red dot in the diagram below shows where HR1681 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR1681. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR1681

SAO131834
SAO131834