Your Guide to the Solar System and the Night Sky
This site is free and ad-free thanks to the support of our users. If you can, please consider a donation.
public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 6:43  
clear_day Transit: 12:51  
SunsetSet: 18:59 south
sunny DaytimeWhat's Visible Now
All Constellations » Ophiuchus » 

45 Ophiuchi

Altitude: 6.7°   Azimuth: 162.3°   Direction: South-South-East

45 Ophiuchi is a sub-giant star in the constellation of Ophiuchus.

45 Ophiuchi visual magnitude is 4.29. Because of its moderate brightness, 45 Ophiuchi 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 45 Ophiuchi:


45 Ophiuchi is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 6.7°
Azimuth: 162.3°
Direction: South-South-East

Celestial coordinates and finder chart of 45 Ophiuchi

45 Ophiuchi 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 45 Ophiuchi are provided in the following table:

17h 27m 21s
-29° 52’ 00”

The simplified sky map below shows the position of 45 Ophiuchi in the sky:

Finder chart 45 Ophiuchi star
Simplified finder chart for 45 Ophiuchi.

Visibility of 45 Ophiuchi 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 45 Ophiuchi 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: 119.9°
Max altitude: 8.7°
Azimuth: 240.1°

Digitized Sky Survey image of 45 Ophiuchi

The image below is a photograph of 45 Ophiuchi 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 45 Ophiuchi is 0.02 arcsec per year in Right Ascension and -0.139 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 45 Ophiuchi star
DSS2 image of 45 Ophiuchi. The red arrow shows the motion of 45 Ophiuchi during the next 1000 years (0.33 arcmin in Right Ascension and -2.32 arcmin in declination);

Distance of 45 Ophiuchi from the Sun and relative movement

45 Ophiuchi is distant 111.41 light years from the Sun and it is moving far from the Sun at the speed of 37 kilometers per second.

34.18 pc
111.41 ly
37 km/s
0.02 arcsec/year
-0.139 arcsec/year

Spectral properties of 45 Ophiuchi

45 Ophiuchi belongs to spectral class F5 and has a luminosity class of IV corresponding to a sub-giant star.


The red dot in the diagram below shows where 45 Ophiuchi is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 45 Ophiuchi. Attribution: Richard Powell / CC BY-SA

Alternative designations of 45 Ophiuchi

45 Ophiuchi