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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:50  
clear_day Transit: 12:56  
SunsetSet: 21:02 south
sunny DaytimeWhat's Visible Now
All Constellations » Sagittarius » 

ρ1 Sagittarii (rho1 Sagittarii)

ρ1 Sagittarii is a variable and double hypergiant star in the constellation of Sagittarius.

ρ1 Sagittarii visual magnitude is 3.93. Because of its moderate brightness, ρ1 Sagittarii should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about ρ1 Sagittarii:

ρ1 Sagittarii (rho1 Sagittarii) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Celestial coordinates and finder chart of ρ1 Sagittarii

ρ1 Sagittarii 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 ρ1 Sagittarii are provided in the following table:

19h 21m 40s
-17° 50’ 49”

The simplified sky map below shows the position of ρ1 Sagittarii in the sky:

Finder chart ρ1 Sagittarii (rho1 Sagittarii) star
Simplified finder chart for ρ1 Sagittarii (rho1 Sagittarii).

Visibility of ρ1 Sagittarii 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 ρ1 Sagittarii (rho1 Sagittarii) 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: 107.8°
Max altitude: 20.7°
Azimuth: 252.2°
ρ1 Sagittarii (rho1 Sagittarii) is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of ρ1 Sagittarii

The image below is a photograph of ρ1 Sagittarii 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 ρ1 Sagittarii is -0.024 arcsec per year in Right Ascension and 0.024 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of ρ1 Sagittarii (rho1 Sagittarii) star
DSS2 image of ρ1 Sagittarii. The red arrow shows the motion of ρ1 Sagittarii during the next 10000 years (-4.00 arcmin in Right Ascension and 4.00 arcmin in declination);

Distance of ρ1 Sagittarii from the Sun and relative movement

ρ1 Sagittarii is distant 121.69 light years from the Sun and it is moving far from the Sun at the speed of 1 kilometers per second.

37.33 pc
121.69 ly
1 km/s
-0.024 arcsec/year
0.024 arcsec/year

Spectral properties of ρ1 Sagittarii

ρ1 Sagittarii belongs to spectral class F0 and has a luminosity class of IV corresponding to a hypergiant star.


The red dot in the diagram below shows where ρ1 Sagittarii is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of ρ1 Sagittarii. Attribution: Richard Powell / CC BY-SA

ρ1 Sagittarii star system properties

ρ1 Sagittarii is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the ρ1 Sagittarii double sysyem:

0 arcsec

Alternative designations of ρ1 Sagittarii

ρ1 Sagittarii
(rho1 Sagittarii)
44 Sagittarii