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7 Lyncis

7 Lyncis Facts

  • 7 Lyncis is a pulsating giant star that can be located in the constellation of Lynx. The description is based on the spectral class.
  • 7 Lyncis is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (K0III:) of the star, the star's colour is orange to red .
  • The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 964.98 light years away from us. Distance

7 Lyncis's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR2376. HIP31359 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD46101.

7 Lyncis has alternative name(s) :- BQ Lyncis, BQ Lyn, BQ Lyn.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John named the stars in the constellation with a number and its latin name, this star's Flamsteed designation is 7 Lyncis. The Flamsteed name can be shortened to 7 Lyn.

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+55 1093.

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

Location of 7 Lyncis

The location of the giant 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 7 Lyncis, the location is 06h 34m 32.80 and +55° 21` 10.9 .

Radial Velocity and Proper Motion of 7 Lyncis

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 5.85 ± 0.32 milliarcseconds/year towards the north and 3.15 ± 0.56 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 -9.44000 km/s with an error of about 0.30 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 7 Lyncis

7 Lyncis Temperature and Colour

Based on the star's spectral type of K0III: , 7 Lyncis's colour and type is orange to red giant star. The star has a B-V Colour Index of 1.55 which means the star's temperature is about 3,892 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

7 Lyncis 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 617.76 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

7 Lyncis Radius

7 Lyncis estimated radius has been calculated as being 50.19 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 34,918,952.97.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 31.229618329925530036260710778. 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.

7 Lyncis Apparent and Absolute Magnitudes

7 Lyncis has an apparent magnitude of 6.45 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 -1.94 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.91. 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 7 Lyncis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.10000 which gave the calculated distance to 7 Lyncis as 1553.16 light years away from Earth or 476.19 parsecs. If you want that in miles, it is about 9,130,445,784,613,855.71, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 3.38000 which put 7 Lyncis at a distance of 964.98 light years or 295.86 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 61,025,080.35 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 7,655.00 Parsecs or 24,967.80 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 7 Lyncis

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)
Walking4161,782,908,663.11
Car1205,392,763,622.10
Airbus A380736879,254,938.39
Speed of Sound (Mach 1)767.269843,422,104.44
Concorde (Mach 2)1,534.54421,710,502.60
New Horizons Probe33,00019,610,049.53
Speed of Light670,616,629.00964.98

Variable Type of 7 Lyncis

The star is a pulsating Semi-Regular Star w 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. 7 Lyncis brightness ranges from a magnitude of 6.684 to a magnitude of 6.466 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 62.7 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 7 Lyncis Facts and Figures

Visual Facts


Primary / Proper / Traditional Name7 Lyncis
Alternative NamesBQ Lyncis, BQ Lyn, HD 46101, HIP 31359, HR 2376, 7 Lyn, BD+55 1093, BQ Lyn
Spectral TypeK0III:
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
ColourOrange to Red
GalaxyMilky Way
ConstellationLynx
Absolute Magnitude -1.94 / -0.91
Visual / Apparent Magnitude6.45
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)06h 34m 32.80
Declination (Dec.)+55° 21` 10.9
Galactic Latitude19.74695637 degrees
Galactic Longitude159.97387683 degrees
1997 Distance from Earth2.10000 Parallax (milliarcseconds)
 1553.16 Light Years
 476.19 Parsecs
2007 Distance from Earth3.38000 Parallax (milliarcseconds)
 964.98 Light Years
 295.86 Parsecs
 61,025,080.35 Astronomical Units
Galacto-Centric Distance24,967.80 Light Years / 7,655.00 Parsecs
Proper Motion Dec.5.85000 ± 0.32000 milliarcseconds/year
Proper Motion RA.3.15000 ± 0.56000 milliarcseconds/year
B-V Index1.55
Radial Velocity-9.44000 ± 0.30 km/s
Eccentricity0.24320
Semi-Major Axis9539.0000000
Stellar Luminosity (Lsun)617.7600000

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSemi-Regular Star w
Mean Variability Period in Days62.690
Variable Magnitude Range (Brighter - Dimmer)6.466 - 6.684

Estimated Calculated Facts


Radius (x the Sun)31.23
Effective Temperature3,892 Kelvin

Sources and Links


SIMBAD SourceLink

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