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BB Sagittarii

BB Sagittarii Facts

BB Sagittarii's Alternative Names

HIP92491 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD174383.

BB Sagittarii has alternative name(s) :- BB Sgr, BB Sgr.

BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is BD-20 5286.

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

Location of BB Sagittarii

The location of the supergiant 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 BB Sagittarii, the location is 18h 50m 59.87 and -20° 17` 42.8 .

Physical Properties (Colour, Temperature) of BB Sagittarii

BB Sagittarii Colour and Temperature

BB Sagittarii has a spectral type of G0Ib. This means the star is a yellow supergiant star. The star has a B-V Colour Index of 0.85 which means the star's temperature is about 5,308 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu at being .

BB Sagittarii Radius

Radius has been calculated as being 77.46 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 53,897,364.58.km. If you need the diameter of the star, you just need to multiple the radius by 2. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

BB Sagittarii Apparent and Absolute Magnitudes

BB Sagittarii has an apparent magnitude of 6.84 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Using the supplied Parallax value, you would get an absolute magnitude of -4.23 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 BB Sagittarii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.61 which gave the calculated distance to BB Sagittarii as 5346.94 light years away from Earth or 1639.34 parsecs. If you want that in miles, it is 3,585,746,878,265.

Travel Time to BB Sagittarii

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Walking4896,436,719,566.32
Car12029,881,223,985.54
Airbus A3807364,871,938,693.30
Speed of Sound (Mach 1)767.2694,673,389,486.95
Concorde (Mach 2)1,534.542,336,691,698.01
New Horizons Probe33,000108,658,996.31
Speed of Light670,616,629.005,346.94

Variable Type of BB Sagittarii

The star is a pulsating Delta Cepheid 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. BB Sagittarii brightness ranges from a magnitude of 7.424 to a magnitude of 6.811 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 6.6 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.

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Additional BB Sagittarii Facts and Figures

Visual Facts


Primary / Proper / Traditional NameBB Sagittarii
Alternative NamesBB Sgr, HD 174383, HIP 92491, BD-20 5286, BB Sgr
Spectral TypeG0Ib
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star less luminour Supergiant Star
ColourYellow
GalaxyMilky Way
ConstellationSagittarius
Absolute Magnitude -4.23
Visual / Apparent Magnitude6.84
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)18h 50m 59.87
Declination (Dec.)-20° 17` 42.8
Galactic Latitude-9.01 degrees
Galactic Longitude14.67 degrees
Distance from Earth0.61 Parallax (milliarcseconds)
 5346.94 Light Years
 1639.34 Parsecs
 338,135,791.31 Astronomical Units
B-V Index0.85
Radial Velocity6.00 ± 0.30 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeDelta Cepheid
Mean Variability Period in Days6.637
Variable Magnitude Range (Brighter - Dimmer)6.811 - 7.424

Estimated Calculated Facts


Radius (x the Sun)77.46
Effective Temperature5,308 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


Comments and Questions

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