21P/Giacobini–Zinner
comet
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Summary
21P/Giacobini–Zinner is a periodic comet[1]. 21P/Giacobini–Zinner ranks in the top 4% of periodic comet entities by monthly Wikipedia readership (1,221 views/month).[2]
Key Facts
- Discoverer or inventor: Michel Giacobini[3], Ernst Zinner[4]
- Instance of: Jupiter-family comet[5], near-Earth object[6]
- Commons category: Comet Giacobini-Zinner[7]
- Parent astronomical body: Sun[8]
- Child astronomical body: Draconids[9]
- Provisional designation: 1991m[10], 1985 XIII[11], 1979 III[12], 1972 VI[13], 1965g[14], 1959b[15], 1946c[16], 1940 I[17], 1933 III[18], 1926e[19], 21P/1913 U1[20], 1913 V[21], 21P/1900 Y1[22], 1900 III[23]
- Time of discovery or invention: December 20, 1900[24]
- Orbital eccentricity: 0.7104704806622166[25]
- Absolute magnitude: 13.2[26]
- Orbital inclination: 32.00259232473731 degree[27]
- Orbital period: 2391.976226852224 day[28]
- Longitude of ascending node: 195.4044801966872 degree[29]
- Semi-major axis of an orbit: 3.500302848567133 astronomical unit[30]
- Apoapsis: 5.987164695851951 astronomical unit[31]
- Periapsis: 1.013441001282316 astronomical unit[32]
- Argument of periapsis: 172.8124824274917 degree[33]
- Mean anomaly: 314.6585273385641 degree[34]
- Diameter: 2.0 km[35]
- Epoch: November 13, 2017[36]
- Time of periapsis: 2458371.765469259 Julian day[37]
Why It Matters
21P/Giacobini–Zinner has Wikipedia articles in 19 language editions, a strong signal of global cultural recognition.[38] 21P/Giacobini–Zinner is known by 32 alternative names across languages and contexts.[39]