Zeta Cancri

ζ Cancri: 16 Cancri • BD 18 ° 1867 • HIP 40167 • Σ 1196 • 6650 • WDS J08122 1739 ADS ζ Cancri AB: ζ1 Cancri • SAO 97645 ζ Cancri A: HR 3208 • HD 68257 ζ Cancri B: HR 3209 • HD 68256 ζ Cancri CD: ζ2 Cancri • HR 3210 • HD 68255

ζ Cancri (Zeta Cancri, short ζ Cnc ) is a little more than 80 light-years distant star system in the constellation of Cancer ( cancer). The star bears the historical proper names tegmen (Latin for " cover, cover, garment", also Tegmine ).

The system consists of at least four, probably five stars. The A and B components are main-sequence stars of spectral type F and orbiting with a period of about 59 years. Together they are referred to, for historical reasons as ζ1 Cancri. Component A has an apparent magnitude of 5.6 mag. Component C is a G - main sequence star, and component D probably consists of two ( not yet resolved ) M- stars; they also carry the designation ζ2 Cancri. The circulation of the system CD to AB takes about 1100 years.

Since the angular distance between A and B at the time only 0.8 arc seconds ( position angle: 72 degrees ) is required for their separation a telescope of 20 centimeters lens diameter. The gap will widen by 2020, so that then the resolution should be possible with smaller instruments. The separation of the system of AB CD is already with a telescope with a 5 inch lens aperture problem, since the angular distance 5.7 arc seconds ( position angle: 88 degrees).

All components of ζ Cancri may also be covered by planets as stars from the ecliptic Moon, and (very rare).

The binary nature of ζ Cancri was discovered in 1756 by Tobias Mayer and his triple-star Nature in 1783 by William Herschel.

Left

• Deep sky Top 100 (5): Zeta Cancri in cancer
• Zeta Cancri

• Individual star fifth size and darker
• Binary star
• Yellow Dwarf
• Cancer ( constellation )