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29 G. Sagittarii, HD165185, HIP88694

29 G. Sagittarii is a white to yellow main sequence dwarf star that can be located in the constellation of Sagittarius. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it. The star has an estimated age of 5.10 Billion of Years but could be as young as 1.00 to 8.80 according to Hipparcos.

HIP88694 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD165185. The Id of the star in the Gould Star Catalogue is 29. Stars in the southern hemisphere are more likely to have a Gould Id than the northern hemisphere. For example, there are no Gould classified stars in Ursa Major. The Gliese ID of the star is Gliese GL702.1. The star was part of the original catalogue devised by German Astronomer Wilheim Gliese of stars located within 20 parsecs of Earth. Ref : Star Names.

Location of 29 G. Sagittarii

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 29 G. Sagittarii, the location is 18h 06m 23.64 and -36d 01` 11.3 .

Proper Motion of 29 G. Sagittarii

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 7.95 ± 0.27 miliarcseconds/year towards the north and 105.05 ± 0.48 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Age, Radius) of 29 G. Sagittarii

29 G. Sagittarii has a spectral type of G3V. This means the star is a white to yellow main sequence dwarf star. The star is 7383.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24080.6396875200000000s. The star has a B-V Colour Index of 0.61 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,859 Kelvin.

29 G. Sagittarii Radius has been calculated as being 1.02 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 710,713.06.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 1.03. 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 -0.07 with an error value of 0.02 Fe/H with the Sun has a value of 1 to put it into context.

The stars age according to Hipparcos data files put the star at an age of about 5.10 Billion years old but could be between 1.00 and 8.80 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

29 G. Sagittarii Apparent and Absolute Magnitudes

29 G. Sagittarii has an apparent magnitude of 5.94 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 4.74 If you used the 2007 Parallax value, you would get an absolute magnitude of 4.72. 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 29 G. Sagittarii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 57.58 which gave the calculated distance to 29 G. Sagittarii as 56.65 light years away from Earth or 17.37 parsecs. It would take a spaceship travelling at the speed of light, 56.65 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 56.97 which put 29 G. Sagittarii at a distance of 57.25 light years or 17.55 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 7,383.00 Parsecs or 24,080.64 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*. 29 G. Sagittarii brightness ranges from a magnitude of 6.089 to a magnitude of 6.054 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.0 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.

29 G. Sagittarii Facts

Alternative Names

Traditional/Proper Name29 G. Sagittarii
Hipparcos Library I.D.88694
Gould I.D.29
Gliese ID702.1
Henry Draper Designation165185

Visual Facts

Star Typemain sequence dwarf star
Age5.10 Billion Years Old
Age Range1.00 - 8.80 Billion Years Old
Absolute Magnitude4.74 / 4.72
Visual / Apparent Magnitude5.94
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)18h 06m 23.64
Declination (Dec.)-36d 01` 11.3
Galactic Latitude-7.33 degrees
Galactic Longitude356.04 degrees
1997 Distance from Earth57.58 Parallax (milliarcseconds)
 56.65 Light Years
 17.37 Parsecs
2007 Revised Distance from Earth56.97 Parallax (milliarcseconds)
 57.25 Light Years
 17.55 Parsecs
Galacto-Centric Distance24,080.64 Light Years / 7,383.00 Parsecs
Proper Motion Dec.7.95 ± 0.27 milliarcseconds/year
Proper Motion RA.105.05 ± 0.48 milliarcseconds/year
B-V Index0.61
Radial Velocity15.00 ± 0.20 km/s
Iron Abundance-0.07 ± 0.02 Fe/H
Spectral TypeG3V
Colour(G) White to Yellow

Variable Star Details

Mean Variability Period in Days0.022
Variable Magnitude Range (Brighter - Dimmer)6.054 - 6.089

Estimated Facts

Calculated Effective Temperature5,859 Kelvin

Sources and Links

SIMBAD SourceLink

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