Universe Guide


DT Piscium, HD7351, HIP5772

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

HIP5772 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD7351.

DT Piscium has alternative name(s), NSV 00444.

Location of DT Piscium

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 DT Piscium, the location is 01h 14m 04.87 and +28d31`46.9 .

Proper Motion of DT Piscium

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 -53.54 ± 0.46 miliarcseconds/year towards the north and 61.51 ± 0.58 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of DT Piscium

DT Piscium has a spectral type of M2S SB. This means the star is a red star. The star has a B-V Colour Index of 1.6 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,775 Kelvin.

DT Piscium Radius has been calculated as being 36.90 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 25,678,231.52.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 48.20. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is 0.04 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

DT Piscium Apparent and Absolute Magnitudes

DT Piscium has an apparent magnitude of 6.33 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 -1.14 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.72. 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 DT Piscium

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.21 which gave the calculated distance to DT Piscium as 1016.09 light years away from Earth or 311.53 parsecs. It would take a spaceship travelling at the speed of light, 1016.09 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 2.45 which put DT Piscium at a distance of 1331.28 light years or 408.16 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 DT Piscium

The star is a pulsating Semiregular late- (M, C, S or Me, Ce, Se) giants with poorly defined periodicity 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. This is a some uncertainty as to the type but the type mentioned is the current variable star classification for this star. DT Piscium brightness ranges from a magnitude of 6.449 to a magnitude of 6.373 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 7.5 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.

DT Piscium Facts

Alternative Names

Traditional/Proper NameDT Piscium
Short NameNSV 00444
Hipparcos Library I.D.5772
Bonner DurchmusterungBD+27 196
Henry Draper Designation7351

Visual Facts

Star Type star
Absolute Magnitude-1.14 / -1.72
Visual / Apparent Magnitude6.33
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)01h 14m 04.87
Declination (Dec.)+28d31`46.9
Galactic Latitude-34.08 degrees
Galactic Longitude128.94 degrees
1997 Distance from Earth3.21 Parallax (milliarcseconds)
 1016.09 Light Years
 311.53 Parsecs
2007 Revised Distance from Earth2.45 Parallax (milliarcseconds)
 1331.28 Light Years
 408.16 Parsecs
Proper Motion Dec.-53.54 ± 0.46 milliarcseconds/year
Proper Motion RA.61.51 ± 0.58 milliarcseconds/year
B-V Index1.60
Radial Velocity1.55 ± 0.15 km/s
Iron Abundance0.04 ± 9.99 Fe/H
Spectral TypeM2S SB
Colour(M) Red

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSemiregular late- (M, C, S or Me, Ce, Se) giants with poorly defined periodicity probably
Mean Variability Period in Days7.494
Variable Magnitude Range (Brighter - Dimmer)6.373 - 6.449

Estimated Facts

Calculated Effective Temperature3,775 Kelvin

Sources and Links

SIMBAD SourceLink

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