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HZ 21

HZ 21 Facts

  • HZ 21 is a dwarf star that can be located in the constellation of Coma Berenices. The description is based on the spectral class.
  • HZ 21 is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (DO1 C) of the star, the star's colour is white.
  • The star is calculated at being about 516.09 light years away from us. Distance

HZ 21's Alternative Names

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

Location of HZ 21

The location of the dwarf 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 HZ 21, the location is 12 13 56.2639830406 and +32 56 31.359805342 .

Proper Motion of HZ 21

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 30.13 milliarcseconds/year towards the north and -100.88 milliarcseconds/year east if we saw them in the horizon. . 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 HZ 21

HZ 21 Colour

Based on the star's spectral type of DO1 C , HZ 21's colour and type is white dwarf star.

Distance to HZ 21

The Parallax of the star is given as 6.31990 which gives a calculated distance to HZ 21 of 516.09 light years from the Earth or 158.23 parsecs. It is about 3,033,899,768,846,329 miles from Earth.

The star is roughly 32,637,052.87 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.

Travel Time to HZ 21

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)
Walking486,524,634,015.15
Car1202,884,154,467.17
Airbus A380736470,242,576.17
Speed of Sound (Mach 1)767.269451,078,482.33
Concorde (Mach 2)1,534.54225,538,947.22
New Horizons Probe33,00010,487,834.43
Speed of Light670,616,629.00516.09

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Additional HZ 21 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHZ 21
Alternative Names,
Spectral TypeDO1 C
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeDwarf Star
ColourWhite
GalaxyMilky Way
ConstellationComa Berenices
Right Ascension (R.A.)12 13 56.2639830406
Declination (Dec.)+32 56 31.359805342
Distance from Earth6.31990 Parallax (milliarcseconds)
 516.09 Light Years
 158.23 Parsecs
 32,637,052.87 Astronomical Units
Proper Motion Dec.30.13200 milliarcseconds/year
Proper Motion RA.-100.88300 milliarcseconds/year

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Sources and Links


Sourcehttp://simbad.u-strasbg.fr/simbad/sim-id?Ident=hz21

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Comments and Questions

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