Universe Guide


V695 Monocerotis, HD65875, HIP39172

V695 Monocerotis is a blue eruptive main sequence dwarf star that can be located in the constellation of Monoceros. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

HIP39172 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD65875.

V695 Monocerotis has alternative name(s), V695 Mon.

Location of V695 Monocerotis

The location of the star in the galaxy 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 star is compared to the celestial equator and is expressed in degrees. For V695 Monocerotis, the location is 08h 00m 44.14 and -02d52`54.9 .

Proper Motion of V695 Monocerotis

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 1.74 ± 0.25 miliarcseconds/year towards the north and -5.86 ± 0.40 miliarcseconds/year east if we saw them in the horizon.

V695 Monocerotis Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 3190.0000000 that I have given is based on the Spectral Types page that I have found on the Internet. You might find a different figure, one that may have been calculated rather than generalised that I have done. The figure is always the amount times the luminosity of the Sun. It is an imprecise figure because of a number of factors including but not limited to whether the star is a variable star and distance.

Physical Properties (Colour, Temperature, Radius) of V695 Monocerotis

V695 Monocerotis has a spectral type of B2.5Ve. This means the star is a blue main sequence dwarf star. The star has a B-V Colour Index of -0.08 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 11,099 Kelvin.

V695 Monocerotis Radius has been calculated as being 12.54 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 8,726,785.32.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 9.34. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V695 Monocerotis Apparent and Absolute Magnitudes

V695 Monocerotis has an apparent magnitude of 6.41 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. If you used the 1997 Parallax value, you would get an absolute magnitude of -3.48 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.84. Magnitude, whether it be apparent/visual or absolute magnitude is measured by a number, the smaller the number, the brighter the Star is. Our own Sun is the brightest star and therefore has the lowest of all magnitudes, -26.74. A faint star will have a high number.

Distance to V695 Monocerotis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.05 which gave the calculated distance to V695 Monocerotis as 3106.32 light years away from Earth or 952.38 parsecs. It would take a spaceship travelling at the speed of light, 3106.32 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

In 2007, Hipparcos data was revised with a new parallax of 1.41 which put V695 Monocerotis at a distance of 2313.22 light years or 709.22 parsecs. It should not be taken as though the star is moving closer or further away from us. It is purely that the distance was recalculated.

Variable Type of V695 Monocerotis

The star is a eruptive Gamma Cassiopeiae 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. V695 Monocerotis brightness ranges from a magnitude of 6.516 to a magnitude of 6.397 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 days (variability).

Source of Information

The source of the information if it has a Hip I.D. is from Simbad, the Hipparcos data library based at the University at Strasbourg, France. Hipparcos was a E.S.A. satellite operation launched in 1989 for four years. The items in red are values that I've calculated so they could well be wrong. Information regarding Metallicity and/or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

V695 Monocerotis Facts

Alternative Names

Traditional/Proper NameV695 Monocerotis
Short NameV695 Mon
Hipparcos Library I.D.39172
Bonner DurchmusterungBD-02 2379
Henry Draper Designation65875

Visual Facts

Star Typemain sequence dwarf star
Absolute Magnitude-3.48 / -2.84
Visual / Apparent Magnitude6.41
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)08h 00m 44.14
Declination (Dec.)-02d52`54.9
Galactic Latitude13.99 degrees
Galactic Longitude223.64 degrees
1997 Distance from Earth1.05 Parallax (milliarcseconds)
 3106.32 Light Years
 952.38 Parsecs
2007 Revised Distance from Earth1.41 Parallax (milliarcseconds)
 2313.22 Light Years
 709.22 Parsecs
Proper Motion Dec.1.74 ± 0.25 milliarcseconds/year
Proper Motion RA.-5.86 ± 0.40 milliarcseconds/year
B-V Index-0.08
Radial Velocity46.60 ± 1.60 km/s
Spectral TypeB2.5Ve
Colour(B) blue

Variable Star Details

Variable Star ClassEruptive
Variable Star TypeGamma Cassiopeiae
Mean Variability Period in Days0.099
Variable Magnitude Range (Brighter - Dimmer)6.397 - 6.516

Estimated Facts

Luminosity (x the Sun)3,190.0000000
Calculated Effective Temperature11,099 Kelvin

Sources and Links

SIMBAD SourceLink

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