Universe Guide

HIP 76867, HD140487

HIP 76867 Facts

  • HIP 76867 is a variable star that can be located in the constellation of Bootes. The description is based on the spectral class.
  • HIP 76867 is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (G5) of the star, the star's colour is yellow .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star has an estimated age of 9.90 Billion of Years but could be as young as 6.70 to 11.50 according to Hipparcos.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 201.21 light years away from us. Distance

HIP 76867's Alternative Names

HIP76867 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD140487.

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+49 2417.

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

Location of HIP 76867

The location of the variable 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 HIP 76867, the location is 15h 41m 47.55 and +49° 26` 42.3 .

Radial Velocity and Proper Motion of HIP 76867

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 93.72 ± 0.46 milliarcseconds/year towards the north and -78.52 ± 0.53 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 -16.10000 km/s with an error of about 0.40 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.

Physical Properties of HIP 76867

HIP 76867 Temperature and Colour

Based on the star's spectral type of G5 , HIP 76867's colour and type is yellow variable star. The star has a B-V Colour Index of 0.63 which means the star's temperature is about 5,807 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

HIP 76867 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 1.24 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

HIP 76867 Radius

HIP 76867 estimated radius has been calculated as being 1.03 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 713,571.26.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 1.0738754298049295520600035808. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It has been known to produce widely incorrect figures.

HIP 76867 Iron Abundance

HIP 76867 Iron Abundance is -0.01 with an error value of 0.04 Fe/H with the Sun has a value of 1 to put it into context. The value comes from the Hipparcos Extended Catalog.

HIP 76867 Estimated Age

The stars age according to Hipparcos data files put the star at an age of about 9.90 Billion years old but could be between 6.70 and 11.50 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

HIP 76867 Apparent and Absolute Magnitudes

HIP 76867 has an apparent magnitude of 8.62 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 4.77 If you used the 2007 Parallax value, you would get an absolute magnitude of 4.67. 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 HIP 76867

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 17.00000 which gave the calculated distance to HIP 76867 as 191.86 light years away from Earth or 58.82 parsecs. If you want that in miles, it is about 1,127,873,064,099,007.41, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 16.21000 which put HIP 76867 at a distance of 201.21 light years or 61.69 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 12,724,387.23 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 7,393.00 Parsecs or 24,113.26 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Travel Time to HIP 76867

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)
Airbus A380736183,335,287.94
Speed of Sound (Mach 1)767.269175,863,708.71
Concorde (Mach 2)1,534.5487,931,739.75
New Horizons Probe33,0004,088,932.48
Speed of Light670,616,629.00201.21
HIP 76867 brightness ranges from a magnitude of 8.796 to a magnitude of 8.726 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.

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Additional HIP 76867 Facts and Figures

Visual Facts

Primary / Proper / Traditional NameHIP 76867
Alternative NamesHD 140487, HIP 76867, BD+49 2417
Spectral TypeG5
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
GalaxyMilky Way
Age9.90 Billion Years Old
Age Range6.70 - 11.50 Billion Years Old
Absolute Magnitude 4.77 / 4.67
Visual / Apparent Magnitude8.62
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)15h 41m 47.55
Declination (Dec.)+49° 26` 42.3
Galactic Latitude50.57608204 degrees
Galactic Longitude79.07606806 degrees
1997 Distance from Earth17.00000 Parallax (milliarcseconds)
 191.86 Light Years
 58.82 Parsecs
2007 Distance from Earth16.21000 Parallax (milliarcseconds)
 201.21 Light Years
 61.69 Parsecs
 12,724,387.23 Astronomical Units
Galacto-Centric Distance24,113.26 Light Years / 7,393.00 Parsecs
Proper Motion Dec.93.72000 ± 0.46000 milliarcseconds/year
Proper Motion RA.-78.52000 ± 0.53000 milliarcseconds/year
B-V Index0.63
Radial Velocity-16.10000 ± 0.40 km/s
Iron Abundance-0.0100 ± 0.04 Fe/H
Semi-Major Axis7490.0000000
Stellar Luminosity (Lsun)1.2400000

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Mean Variability Period in Days0.037
Variable Magnitude Range (Brighter - Dimmer)8.726 - 8.796

Estimated Calculated Facts

Radius (x the Sun)1.07
Effective Temperature5,807 Kelvin

Sources and Links

SIMBAD SourceLink

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