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Upsilon1 Cancri, 30 Cancri, HD72041, HIP41816, HR3355

Upsilon1 Cancri is a blue to white star that can be located in the constellation of Cancer. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Upsilon1 Cancri is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR3355. HIP41816 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD72041.

Location of Upsilon1 Cancri

The location of the star in the galaxy 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 star is compared to the celestial equator and is expressed in degrees. For Upsilon1 Cancri, the location is 08h 31m 30.57 and +24d 04` 52.4 .

Proper Motion of Upsilon1 Cancri

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 -44.57 ± 0.17 miliarcseconds/year towards the north and -81.36 ± 0.29 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is 19.00000 km/s with an error of about 4.30 km/s .

Physical Properties (Colour, Temperature, Radius) of Upsilon1 Cancri

Upsilon1 Cancri has a spectral type of F0IIIn. This means the star is a blue to white star. The star is 7461.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24335.0470958400000000s. The star has a B-V Colour Index of 0.32 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 7,116 Kelvin.

Upsilon1 Cancri Radius has been calculated as being 3.22 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,243,376.71.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 3.39. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Upsilon1 Cancri Apparent and Absolute Magnitudes

Upsilon1 Cancri has an apparent magnitude of 5.71 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 1.29. 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 Upsilon1 Cancri

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 13.75 which gave the calculated distance to Upsilon1 Cancri as 237.21 light years away from Earth or 72.73 parsecs. It would take a spaceship travelling at the speed of light, 237.21 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

In 2007, Hipparcos data was revised with a new parallax of 13.05 which put Upsilon1 Cancri at a distance of 249.93 light years or 76.63 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.

The star's Galacto-Centric Distance is 7,461.00 Parsecs or 24,335.05 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*. Upsilon1 Cancri brightness ranges from a magnitude of 5.812 to a magnitude of 5.758 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.

Upsilon1 Cancri Facts

Alternative Names

Flamsteed Name30 Cancri
Flamsteed Short Name30 Cnc
Bayer DesignationUpsilon1 Cancri
Hipparcos Library I.D.41816
Yale Bright Star Catalogue (HR) Id3355
Bonner DurchmusterungBD+24 1940
Henry Draper Designation72041

Visual Facts

Star Type star
Absolute Magnitude1.40 / 1.29
Visual / Apparent Magnitude5.71
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)08h 31m 30.57
Declination (Dec.)+24d 04` 52.4
Galactic Latitude31.98 degrees
Galactic Longitude200.19 degrees
1997 Distance from Earth13.75 Parallax (milliarcseconds)
 237.21 Light Years
 72.73 Parsecs
2007 Revised Distance from Earth13.05 Parallax (milliarcseconds)
 249.93 Light Years
 76.63 Parsecs
Galacto-Centric Distance24,335.05 Light Years / 7,461.00 Parsecs
Proper Motion Dec.-44.57 ± 0.17 milliarcseconds/year
Proper Motion RA.-81.36 ± 0.29 milliarcseconds/year
B-V Index0.32
Radial Velocity19.00 ± 4.30 km/s
Spectral TypeF0IIIn
Associated / Clustered StarsUpsilon2 Cancri
Colour(F) blue to white

Variable Star Details

Mean Variability Period in Days0.044
Variable Magnitude Range (Brighter - Dimmer)5.758 - 5.812

Estimated Facts

Calculated Effective Temperature7,116 Kelvin

Sources and Links

SIMBAD SourceLink

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