δ Monocerotis (delta Monocerotis)

δ Monocerotis is a double main-sequence star in the constellation of Monoceros.

δ Monocerotis visual magnitude is 4.15. Because of its moderate brightness, δ Monocerotis 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 δ Monocerotis:

Color of δ Monocerotis ⬤

Magnitude of δ Monocerotis 4.15

Class Main-sequence

VISIBILITY RIGHT NOW δ Monocerotis (delta Monocerotis) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Celestial coordinates and finder chart of δ Monocerotis

δ Monocerotis 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 δ Monocerotis are provided in the following table:

Right Ascension J2000 07h 11m 51s

Declination J2000 -00° 29’ 34”

Galactic Longitude 215.7°

Galactic Latitude 4.32°

Constellation Monoceros

The simplified sky map below shows the position of δ Monocerotis in the sky:

Finder chart δ Monocerotis (delta Monocerotis) star

Simplified finder chart for δ Monocerotis (delta Monocerotis).

Visibility of δ Monocerotis 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 δ Monocerotis (delta Monocerotis) 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: 90.5° RISE 9:33

Max altitude: 38.0° TRANSIT 15:28

Azimuth: 269.5° SET 21:24

RIGHT NOW δ Monocerotis (delta Monocerotis) is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of δ Monocerotis

The image below is a photograph of δ Monocerotis 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 δ Monocerotis is -0.001 arcsec per year in Right Ascension and 0.005 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of δ Monocerotis (delta Monocerotis) star

DSS2 image of δ Monocerotis. The red arrow shows the motion of δ Monocerotis during the next 100000 years (-1.67 arcmin in Right Ascension and 8.33 arcmin in declination);

Distance of δ Monocerotis from the Sun and relative movement

δ Monocerotis is distant 374.71 light years from the Sun and it is moving far from the Sun at the speed of 15 kilometers per second.

Distance (parsec) 114.94 pc

Distance (light year) 374.71 ly

Heliocentric radial velocity 15 km/s

Proper Motion RA -0.001 arcsec/year

Proper Motion Dec 0.005 arcsec/year

Spectral properties of δ Monocerotis

δ Monocerotis belongs to spectral class A2 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude -1.15

Spectral Type A2V

Color Index (B-V) -0.01

Temperature of δ Monocerotis 10252K

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

H-R diagram showing the position of δ Monocerotis. Attribution: Richard Powell / CC BY-SA

δ Monocerotis star system properties

δ Monocerotis 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 δ Monocerotis double sysyem:

Main star magnitude 4.15

Secondary star magnitude 13.35

Magnitude difference 9.2

Separation 32 arcsec

Alternative designations of δ Monocerotis

Bayer designation δ Monocerotis
(delta Monocerotis)

Flamsteed designation 22 Monocerotis

Henry Draper Catalogue HD55185

SAO Catalogue SAO134330

Hipparcos Catalogue HIP34769

Durchmusterung Catalogue BD-00 1636

FK5 Catalogue 1187

Aitken Double Star Catalogue ADS5864

In Evidence

Other stars in Monoceros