Universe Guide

VZ Cancri

VZ Cancri Facts

  • VZ Cancri is a pulsating giant star that can be located in the constellation of Cancer. The description is based on the spectral class.
  • VZ Cancri is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (A7IIIvar) of the star, the star's colour is blue - white .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star has an estimated age of 1.30 Billion of Years but could be as young as 1.20 to 1.40 according to Hipparcos.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 509.63 light years away from us. Distance

VZ Cancri's Alternative Names

HIP42594 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD73857.

VZ Cancri has alternative name(s) :- VZ Cnc, VZ Cnc.

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+10 1848.

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

Location of VZ Cancri

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 VZ Cancri, the location is 08h 40m 52.14 and +09° 49` 27.3 .

Radial Velocity and Proper Motion of VZ Cancri

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 -16.07 ± 0.36 milliarcseconds/year towards the north and -27.65 ± 0.65 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 25.20000 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 VZ Cancri

VZ Cancri Colour and Temperature

Based on the star's spectral type of A7IIIvar , VZ Cancri's colour and type is blue - white giant star. The star has a B-V Colour Index of 0.28 which means the star's temperature is about 7,322 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

VZ Cancri 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 15.96 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

VZ Cancri Radius

VZ Cancri estimated radius has been calculated as being 3.05 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,118,920.37.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 2.5800414180664421256584526109. 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.

VZ Cancri Iron Abundance

VZ Cancri Iron Abundance is -0.07 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context. The value comes from the Hipparcos Extended Catalog.

VZ Cancri Estimated Age

The stars age according to Hipparcos data files put the star at an age of about 1.30 Billion years old but could be between 1.20 and 1.40 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

VZ Cancri Apparent and Absolute Magnitudes

VZ Cancri has an apparent magnitude of 7.73 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 1.40 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.76. 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 VZ Cancri

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 5.43000 which gave the calculated distance to VZ Cancri as 600.67 light years away from Earth or 184.16 parsecs. If you want that in miles, it is about 3,531,113,902,910,199.02, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 6.40000 which put VZ Cancri at a distance of 509.63 light years or 156.25 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 32,228,651.40 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 7,510.00 Parsecs or 24,494.87 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 VZ Cancri

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 A380736464,356,457.39
Speed of Sound (Mach 1)767.269445,432,244.28
Concorde (Mach 2)1,534.54222,715,831.87
New Horizons Probe33,00010,356,556.14
Speed of Light670,616,629.00509.63

Variable Type of VZ Cancri

The star is a pulsating Phenomenologically, 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. VZ Cancri brightness ranges from a magnitude of 7.994 to a magnitude of 7.362 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.2 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 VZ Cancri Facts and Figures

Visual Facts

Primary / Proper / Traditional NameVZ Cancri
Alternative NamesVZ Cnc, HD 73857, HIP 42594, BD+10 1848, VZ Cnc
Spectral TypeA7IIIvar
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
GalaxyMilky Way
Age1.30 Billion Years Old
Age Range1.20 - 1.40 Billion Years Old
Absolute Magnitude 1.40 / 1.76
Visual / Apparent Magnitude7.73
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)08h 40m 52.14
Declination (Dec.)+09° 49` 27.3
Galactic Latitude28.73735969 degrees
Galactic Longitude216.50311829 degrees
1997 Distance from Earth5.43000 Parallax (milliarcseconds)
 600.67 Light Years
 184.16 Parsecs
2007 Distance from Earth6.40000 Parallax (milliarcseconds)
 509.63 Light Years
 156.25 Parsecs
 32,228,651.40 Astronomical Units
Galacto-Centric Distance24,494.87 Light Years / 7,510.00 Parsecs
Proper Motion Dec.-16.07000 ± 0.36000 milliarcseconds/year
Proper Motion RA.-27.65000 ± 0.65000 milliarcseconds/year
B-V Index0.28
Radial Velocity25.20000 ± 0.40 km/s
Iron Abundance-0.0700 ± 9.99 Fe/H
Semi-Major Axis7186.0000000
Stellar Luminosity (Lsun)15.9600000

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassPulsating
Variable Star TypePhenomenologically,
Mean Variability Period in Days0.178
Variable Magnitude Range (Brighter - Dimmer)7.362 - 7.994

Estimated Calculated Facts

Radius (x the Sun)2.58
Effective Temperature7,322 Kelvin

Sources and Links

SIMBAD SourceLink

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Comments and Questions

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