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Musica (18 Delphini) - HD199665 - HIP103527 - HR8030

Musica (18 Delphini) is a white to yellow giant star that can be located in the constellation of Delphinus. 18 Delphini is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR8030. HIP103527 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD199665. Musica has alternative name(s), 18 Delphini , 18 Del. Musica has at least 1 Extrasolar Planets believed to be in orbit around the star.

Location of Musica

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 Musica, the location is 20h 58m 25.96 and +10d50`21.7 .

Proper Motion of Musica

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 -034.43 ± 000.15 towards the north and -048.75 ± 000.31 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Mass, Radius) of Musica

Musica has a spectral type of G6III:. This means the star is a white to yellow giant star. The star has a B-V Colour Index of 0.93 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,989 Kelvin.

Musica has been calculated as 7.23 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 5,027,465.97.km. The star's solar mass is 2.00 times that of the Sun's. The Sun's Mass is 1,989,100,000,000,000,000,000 billion kg. which to calculate using this website is too large. To give idea of size, the Sun is 99.86% the mass of the solar system.

The star's metallicity is -0.052000, this value is the fractional amount of the star that is not Hydrogen (X) or Helium (Y). An older star would have a high metallicity whereas a new star would have a lower one.

Musica Apparent and Absolute Magnitudes

Musica has an apparent magnitude of 5.51 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 1.19 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.13. 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 Musica

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 13.68 which gave the calculated distance to Musica as 238.42 light years away from Earth or 73.10 parsecs. It would take a spaceship travelling at the speed of light, 238.42 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 13.28 which put Musica at a distance of 245.60 light years or 75.30 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.

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 Stellar Age, Metallicity or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

Musica Facts

Alternative Names

Traditional NameMusica
Short Name18 Del
Bayer Designation18 Delphini
Alternative Name(s)18 Delphini
Hipparcos Library I.D.103527
Yale Bright Star Catalogue (HR) Id8030
Bonner DurchmusterungBD+10 4425
Henry Draper Designation199665

Visual Facts

Star Typegiant star
Absolute Magnitude1.19 / 1.13
Apparent Magnitude5.51
Right Ascension (R.A.)20h 58m 25.96
Declination (Dec.)+10d50`21.7
1997 Distance from Earth13.68 Parallax (milliarcseconds)
 238.42 Light Years
 73.10 Parsecs
2007 Revised Distance from Earth13.28 Parallax (milliarcseconds)
 245.60 Light Years
 75.30 Parsecs
Proper Motion Dec.-34.43 ± 0.15 milliarcseconds/year
Proper Motion RA.-48.75 ± 0.31 milliarcseconds/year
B-V Index0.93
Spectral TypeG6III:
Colour(G) White to Yellow

Companions (Multi-Star and Exoplanets) Facts

Exoplanet Count1

Estimated Facts

Radius (x the Sun)7.23
Calculated Effective Temperature4,989 Kelvin
Mass Compared to the Sun2.00
Metallicity-0.05200

Sources and Links

SIMBAD SourceLink

Related Stars

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.


Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
199665+10 4425.0A5.60000-27.00000-32.00000K0Orange
+10 4426.0B10.200008.00000-16.000001908
BC11.000001907

Location of Musica in Delphinus


Musica (18 Delphini) Location in Delphinus

The map was generated using Night Vision, an awesome free application by Brian Simpson.


List of Extrasolar Planets orbiting Musica


NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastron
18 Del BConfirmed10.3993.3000.0820082.6166.000

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