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: 4:46  
clear_day Transit: 12:56  
SunsetSet: 21:07 south
wb_twilight Astronomical TwilightWhat's Visible Now
All Constellations » Crater » 

HR4491

Altitude: 2.4°   Azimuth: 239.2°   Direction: West-South-West

HR4491 is a variable giant star in the constellation of Crater.

HR4491 visual magnitude is 6.19. Because of its reltive faintness, HR4491 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 HR4491:

6.19
Giant

HR4491 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 2.4°
Azimuth: 239.2°
Direction: West-South-West

Celestial coordinates and finder chart of HR4491

HR4491 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 HR4491 are provided in the following table:

11h 39m 50s
-16° 37’ 13”
279.21°
42.93°
Crater

The simplified sky map below shows the position of HR4491 in the sky:

Finder chart HR4491 star
Simplified finder chart for HR4491.

Visibility of HR4491 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 HR4491 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: 106.6°
Max altitude: 21.9°
Azimuth: 253.4°
HR4491 is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of HR4491

The image below is a photograph of HR4491 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 HR4491 is -0.01 arcsec per year in Right Ascension and -0.009 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR4491 star
DSS2 image of HR4491. The red arrow shows the motion of HR4491 during the next 10000 years (-1.67 arcmin in Right Ascension and -1.50 arcmin in declination);

Distance of HR4491 from the Sun and relative movement

HR4491 is distant 1,012.42 light years from the Sun and it is moving far from the Sun at the speed of 26 kilometers per second.

310.56 pc
1,012.42 ly
26 km/s
-0.01 arcsec/year
-0.009 arcsec/year

Spectral properties of HR4491

HR4491 belongs to spectral class M3 and has a luminosity class of III corresponding to a giant star.

-1.27
M3III
3622K

The red dot in the diagram below shows where HR4491 is situated in the HertzsprungÔÇôRussell diagram.

HR Diagram
H-R diagram showing the position of HR4491. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR4491

SAO156819
SAO156819