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V1389 Orionis, HD42787, HIP29509

V1389 Orionis is a red pulsating star that can be located in the constellation of Orion. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

HIP29509 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD42787.

V1389 Orionis has alternative name(s), V1389 Ori.

Location of V1389 Orionis

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 V1389 Orionis, the location is 06h 12m 59.57 and +06d 00` 58.6 .

Proper Motion of V1389 Orionis

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 -13.40 ± 0.33 miliarcseconds/year towards the north and 8.97 ± 0.51 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is 21.87000 km/s with an error of about 0.30 km/s .

Physical Properties (Colour, Temperature, Radius) of V1389 Orionis

V1389 Orionis has a spectral type of M.... This means the star is a red star. The star is 7565.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24674.2569736000000000s. The star has a B-V Colour Index of 1.62 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,719 Kelvin.

V1389 Orionis Radius has been calculated as being 25.12 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 17,479,855.16.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 21.09. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V1389 Orionis Apparent and Absolute Magnitudes

V1389 Orionis has an apparent magnitude of 6.45 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 -0.24 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.14. 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 V1389 Orionis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 4.60 which gave the calculated distance to V1389 Orionis as 709.05 light years away from Earth or 217.39 parsecs. It would take a spaceship travelling at the speed of light, 709.05 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 5.48 which put V1389 Orionis at a distance of 595.19 light years or 182.48 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.

The star's Galacto-Centric Distance is 7,565.00 Parsecs or 24,674.26 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of V1389 Orionis

The star is a pulsating Semi-Regular Star which are giants or supergiants of intermediate and late spectral 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. V1389 Orionis brightness ranges from a magnitude of 6.585 to a magnitude of 6.492 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.

V1389 Orionis Facts

Alternative Names

Traditional/Proper NameV1389 Orionis
Short NameV1389 Ori
Hipparcos Library I.D.29509
Bonner DurchmusterungBD+06 1160
Henry Draper Designation42787

Visual Facts

Star Type star
Absolute Magnitude-0.24 / 0.14
Visual / Apparent Magnitude6.45
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)06h 12m 59.57
Declination (Dec.)+06d 00` 58.6
Galactic Latitude-5.74 degrees
Galactic Longitude203.15 degrees
1997 Distance from Earth4.60 Parallax (milliarcseconds)
 709.05 Light Years
 217.39 Parsecs
2007 Revised Distance from Earth5.48 Parallax (milliarcseconds)
 595.19 Light Years
 182.48 Parsecs
Galacto-Centric Distance24,674.26 Light Years / 7,565.00 Parsecs
Proper Motion Dec.-13.40 ± 0.33 milliarcseconds/year
Proper Motion RA.8.97 ± 0.51 milliarcseconds/year
B-V Index1.62
Radial Velocity21.87 ± 0.30 km/s
Spectral TypeM...
Colour(M) Red

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSemi-Regular Star which are giants or supergiants of intermediate and late spectral
Mean Variability Period in Days0.079
Variable Magnitude Range (Brighter - Dimmer)6.492 - 6.585

Estimated Facts

Calculated Effective Temperature3,719 Kelvin

Sources and Links

SIMBAD SourceLink

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