HD 109771 Star Facts (Distance, Colour & more)

HD 109771Star is located in the constellation of Virgo. Based on the spectral type (K0 D~) of the star, the HD 109771 colour is orange to red . It is not part of the Virgo constellation outline but is within the borders of the constellation.

HD 109771 is located in the Milky Way galaxy, this is the galaxy that you reside in. In case you're wondering, HD 109771 is not located within the Solar System, there is only one star in the Solar System and that is the Sun.

There are no Exoplanets recorded on the site for the star and is most likely the case. If an exoplanet had been spotted or confirmed, it will probably be recorded in Exoplanet EU database.

No one has visited HD 109771 and we have no probes on a rendezvous with the star.

HD 109771 distance from Earth is 698.00 light years. When you look at a star, you are not seeing it in its present form but how it looked many years ago, as a rule of thumb, the number of light years is also the number of years in the past you are looking at it.

HD 109771 Location

The location of the 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 HD 109771, the location is 12 37 12.5510146763 and +11 49 03.987105770 .

HD 109771 Radial Velocity and Proper Motion

HD 109771 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 0.718 milliarcseconds/year towards the north and 24.293 milliarcseconds/year east if we saw them in the horizon.

HD 109771 Radial Velocity

The Radial Velocity, that is the speed at which the star is towards the Sun is -9.92000 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.

HD 109771 Physical Properties

HD 109771 Colour

Based on the star's spectral type of K0 D~ , HD 109771's colour and type is orange to red star.

There is no relationship between colour and size, a red star can be both the largest and the smallest stars in the Universe. Small stars are more energy efficient than larger stars and live longer.

HD 109771 Temperature

Based on the spectral type as we don't have the exact temperature', we can deduce that the surface temperature of the star is in the order of 3,500 and 5,000K based on the notes from Harvard University. To put this in context, the temperature of our Sun is about 5,778 Kelvin as said by Google.

• Blue (O) > 25,000K
• Blue/White (B) = 10,000 - 25,000K
• Blue/White (A) = 7,500 - 10,000K
• Yellow/White (F) = 6,000 - 7,500K
• Yellow (G) = 5,000 - 6,000K
• Orange/Red (K) = 3,500 - 5000K
• Red (M) = < 3,500K
• Red (C) = < 3,500K

There is a relationship between colour and temperature, stars that are closer to red in the rainbow spectrum are cooler whereas those closer to blue are hotter. Those that are blue stars are normally identified as being young stars whereas redder stars are usually older stars, ones that are at the end of their life. An example of when its a Blue Straggler, the star has stolen matter from a nearby star and grown to appear youthful when its not. These stars are found mainly in Star Clusters.

HD 109771 Distance from Earth

The Parallax of the star is given as 4.67280 which gives a calculated distance to HD 109771 of 698.00 light years from the Earth or 214.00 parsecs. It is about 4,103,280,510,482,160 miles from Earth.

The star is roughly 44,140,360.963 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.

Alternative Names and Meanings

• The Id of the star in the Henry Draper catalogue is HD109771. The catalogue was started by the American doctor and has been expanded on over the years.
• 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+12 2495.

HD 109771 Travel Time

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.

Mach 1 is the speed of sound, Mach 2 is twice the speed of sound. Corncorde before it was retired was the fastest commercial airline across the Atlantic and only one that could do Mach 2.

Description	Speed (m.p.h.)	Time (years)
Walking	4	117,022,601,760.5
Car	120	3,900,753,392.017
Airbus A380	736	635,992,400.872
Mach 1	767.269	610,073,399.345
Mach 2	1,534.54	305,036,302.111
New Horizons	33,000	14,184,557.789
Speed of Light	670,616,629	698

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