21P / Jacobini - Zinner

Comet Jacobini-Zinner (officially 21P / Giacobini-Zinner ) was discovered by M. Jacobini ( Nice , France ) in the constellation Aquarius on December 20, 1900. It was discovered again by E. Zinner ( Bamberg , Germany ) two perihelions later during observation of variables stars near β Shield on October 23, 1913 .

21P / Jacobini - Zinner
Opening
Discoverer	Michelle Jacobini Ernst Zinner
opening date	December 20, 1900
Alternative notation	P / 1900 Y1 ; 1900 III ; 1900c; P / 1913 U1 ; 1913 V ; 1913e; 1926 VI ; 1926e; 1933 III ; 1933c; 1940 I ; 1939l; 1946 V ; 1946c; 1959 VIII ; 1959b; 1966 I ; 1965g; 1972 VI ; 1972d; 1979 III ; 1978h; 1985 XIII ; 1984e; 1992 IX ; 1991m
Orbit characteristics
Age of July 9, 2005
Eccentricity	0.7057
Semimajor axis ( a )	3.527 a. e.
Perihelion ( q )	1,038 a. e.
Aphelion ( Q )	6.015 a. e.
Circulation Period ( P )	6,623 a
Orbital inclination	31.8 °
Last perihelion	July 2, 2005 February 11, 2012
Next perihelion	September 12, 2018
physical characteristics
Meteor showers
Draconids (Jacobinides)

The meteor shower Draconida (also known as the Jacobinids) is associated with the comet Jacobini - Zinner.

This comet was the target for the International Cometary Explorer (Explorer 59) spacecraft, which passed through the gas tail of Comet Jacobini-Zinner on September 11, 1985 .

Comet Jacobini - Zinner is a periodic comet with a circulation period of 6.6 years. The diameter of its core is estimated at 2 km. In 1946 and 1959, flashes of 0.5–1.0 stars were observed in the comet. led.

On September 12, 2018, the comet will pass the perihelion at a distance of 1.03 AU from the sun. A few days later, when it will pass at a minimum distance from the Earth (0.307 AU), its brilliance will reach +6 stars. led ^[1] .