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HD 4166

HD 4166 Facts

HD 4166's Alternative Names

The Id of the star in the Henry Draper catalogue is HD4166.

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

Location of HD 4166

The location of the main sequence 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 4166, the location is 00h 44m 03.7639 and -05` 54° 03.726 .

Proper Motion of HD 4166

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 -0.74 miliarcseconds/year towards the north and 36.36 miliarcseconds/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 (Colour) of HD 4166

HD 4166 has a spectral type of A9V. This means the star is a blue main sequence star.

Distance to HD 4166

The Parallax of the star is given as 2.41 which gives a calculated distance to HD 4166 of 1353.37 light years from the Earth or 414.94 parsecs. It would take a spaceship travelling at the speed of light, 1353.37 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

The star is roughly 85,586,922.33 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.

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Additional HD 4166 Facts and Figures

Visual Facts


Primary / Proper / Traditional NameHD 4166
Alternative NamesHD 4166
Spectral TypeA9V
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type main sequence Dwarf Star
ColourBlue
GalaxyMilky Way
ConstellationCetus
Right Ascension (R.A.)00h 44m 03.7639
Declination (Dec.)-05` 54° 03.726
Distance from Earth2.41 Parallax (milliarcseconds)
 1353.37 Light Years
 414.94 Parsecs
 85,586,922.33 Astronomical Units
Proper Motion Dec.-0.74 milliarcseconds/year
Proper Motion RA.36.36 milliarcseconds/year

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Related Stars


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