Universe Guide

29 G. Sagittarii

29 G. Sagittarii Facts

29 G. Sagittarii's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR6748. 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 Gliese ID of the star is GL 702.1. The star was part of the original catalogue devised by German Astronomer Wilheim Gliese of stars located within 20 parsecs of Earth. Star Names

29 G. Sagittarii has alternative name(s) :- 29 G. Sgr.

The Gould star designation is one that was designed by American astronomer, Benjamin Apthorp Gould. Gould stars are predominantly in the Southern and Equatorial constellations but do appear in northern constellations such as Bootes and Orion. The star has the designation 29 G. Sagittarii. There are no stars with a Gould designation in Ursa Major for example.

More details on objects' alternative names can be found at Star Names .

Location of 29 G. Sagittarii

The location of the main sequence star in the night sky 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 object is compared to the celestial equator and is expressed in degrees. For 29 G. Sagittarii, the location is 18h 06m 23.64 and -36° 01` 11.3 .

Radial Velocity and Proper Motion of 29 G. Sagittarii

Proper Motion

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

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is 15.00 km/s with an error of about 0.20 km/s . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

29 G. Sagittarii 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 1.18 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

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

29 G. Sagittarii Colour and Temperature

29 G. Sagittarii has a spectral type of G3V. This means the star is a yellow main sequence star. 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

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. If you need the diameter of the star, you just need to multiple the radius by 2. 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.

Using the 2007 distance, the star is roughly 3,619,922.13 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

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.

Hide Explanations
Show GridLines

Additional 29 G. Sagittarii Facts and Figures

Visual Facts

Primary / Proper / Traditional Name29 G. Sagittarii
Alternative Names29 G. Sgr, HD 165185, HIP 88694, HR 6748
Spectral TypeG3V
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type Main Sequence Dwarf Star
GalaxyMilky Way
Age5.10 Billion Years Old
Age Range1.00 - 8.80 Billion Years Old
Absolute Magnitude 4.74 / 4.72
Visual / Apparent Magnitude5.94
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)18h 06m 23.64
Declination (Dec.)-36° 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 Distance from Earth56.97 Parallax (milliarcseconds)
 57.25 Light Years
 17.55 Parsecs
 3,619,922.13 Astronomical Units
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
Semi-Major Axis8953.00
Stellar Luminosity (Lsun)1.18

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

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

Estimated Calculated Facts

Radius (x the Sun)1.03
Effective Temperature5,859 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Comments and Questions

There's no register feature and no need to give an email address if you don't need to. All messages will be reviewed before being displayed. Comments may be merged or altered slightly such as if an email address is given in the main body of the comment.

You can decline to give a name which if that is the case, the comment will be attributed to a random star. A name is preferred even if its a random made up one by yourself.

This website is using cookies. More info. That's Fine