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Y Monocerotis

Y Monocerotis Facts

  • Y Monocerotis is a pulsating star that can be located in the constellation of Monoceros. The description is based on the spectral class.
  • Y Monocerotis is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M4-5.5 B) of the star, the star's colour is red .
  • The star is calculated at being about 3905.21 light years away from us. Distance

Y Monocerotis's Alternative Names

The Id of the star in the Henry Draper catalogue is HD51189.

Y Monocerotis has alternative name(s) :- Y Mon.

BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is BD +11 1370a.

More details on objects' alternative names can be found at Star Names .

Location of Y Monocerotis

The location of the star in the night sky is determined by the Right Ascension (R.A.) and Declination (Dec.), these are equivalent to the Longitude and Latitude on the Earth. The Right Ascension is how far expressed in time (hh:mm:ss) the star is along the celestial equator. If the R.A. is positive then its eastwards. The Declination is how far north or south the object is compared to the celestial equator and is expressed in degrees. For Y Monocerotis, the location is 06 56 52.1417699916 and +11 14 32.478507826 .

Radial Velocity and Proper Motion of Y Monocerotis

Proper Motion

All stars like planets orbit round a central spot, in the case of planets, its the central star such as the Sun. In the case of a star, its the galactic centre. The constellations that we see today will be different than they were 50,000 years ago or 50,000 years from now. Proper Motion details the movements of these stars and are measured in milliarcseconds. The star is moving -8.93 milliarcseconds/year towards the north and -1.26 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is 71.00000 km/s . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties of Y Monocerotis

Y Monocerotis Colour and Temperature

Based on the star's spectral type of M4-5.5 B , Y Monocerotis's colour and type is red star. Based on the star's spectral, the stars temperature is between 2,400.00 and 3,700.00 degrees kelvin.

Distance to Y Monocerotis

The Parallax of the star is given as 0.83520 which gives a calculated distance to Y Monocerotis of 3905.21 light years from the Earth or 1197.32 parsecs. It is about 22,957,266,593,610,366 miles from Earth.

The star is roughly 246,963,256.95 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

Travel Time to Y Monocerotis

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Walking4654,724,691,434.27
Car120 21,824,156,381.14
Airbus A3807363,558,286,366.49
Speed of Sound (Mach 1)767.2693,413,273,266.27
Concorde (Mach 2)1,534.541,706,634,408.84
New Horizons Probe33,00079,360,568.66
Speed of Light670,616,629.003,905.21

Variable Type of Y Monocerotis

The star is a pulsating Omicron Ceti variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted.

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Additional Y Monocerotis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameY Monocerotis
Alternative NamesY Mon, HD 51189, BD +11 1370a
Spectral TypeM4-5.5 B
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeStar
ColourRed
GalaxyMilky Way
ConstellationMonoceros
Right Ascension (R.A.)06 56 52.1417699916
Declination (Dec.)+11 14 32.478507826
Distance from Earth0.83520 Parallax (milliarcseconds)
 3905.21 Light Years
 1197.32 Parsecs
 246,963,256.95 Astronomical Units
Proper Motion Dec.-8.92500 milliarcseconds/year
Proper Motion RA.-1.25900 milliarcseconds/year
Radial Velocity71.00000 km/s
RedShift0.0002370000

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeOmicron Ceti

Estimated Calculated Facts


Calculated Temperature Range2,400.00 - 3,700.00

Sources and Links


Sourcehttp://simbad.u-strasbg.fr/simbad/sim-id?Ident=Y Monocerotis

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