7P/Pons–Winnecke
7P/Pons–Winnecke (also known as Comet Pons–Winnecke) is a periodic Jupiter-family comet with a six-year orbit. Early calculations for the 1921 apparition suggested that the orbit of the comet might collide with Earth in June, but observations on 10 April ruled out an impact. It made a very close approach to Earth in June 1927. The outward migration of perihelion created impressive meteor showers in 1916, 1921 and 1927.
Contemporary 1921 illustration of Pons–Winnecke comet | |
| Discovery | |
|---|---|
| Discovered by | Jean Louis Pons & Friedrich Winnecke |
| Discovery date | June 12, 1819 & March 9, 1858 |
| Designations | |
Alternative designations | 1858 E1, 1858 II, 1819 III, 1927c, 1933b, 1939c, 1945a, 1951c, 1964b, 1970b, 1976f, 1983b, 1989g |
| Orbital characteristics | |
| Epoch | 2023-02-25 |
| Aphelion | 5.59 AU |
| Perihelion | 1.233 AU |
| Semi-major axis | 3.41 AU |
| Eccentricity | 0.6385 |
| Orbital period | 6.30 yrs |
| Inclination | 22.373° |
| Last perihelion | May 27, 2021 January 30, 2015 September 26, 2008 |
| Next perihelion | 2027-Aug-25 |
| Earth MOID | 0.24 AU (36 million km) |
| Physical characteristics | |
| Dimensions | 5.2 km |
| Perihelion distance at different epochs | |||||||
| Epoch | Perihelion (AU) | ||||||
|---|---|---|---|---|---|---|---|
| 1819 | 0.77 | ||||||
| 1875 | 0.83 | ||||||
| 1886 | 0.89 | ||||||
| 1898 | 0.92 | ||||||
| 1909 | 0.97 | ||||||
| 1921 | 1.04 | ||||||
| 1933 | 1.10 | ||||||
| 1989 | 1.26 | ||||||
| 2027 | 1.13 | ||||||
| 2039 | 0.982 | ||||||
| 2062 | 0.847 | ||||||
The next perihelion passage is 25 August 2027 when the comet will have a solar elongation of 63 degrees. The last perihelion passage was 27 May 2021 when the comet had a solar elongation of 107 degrees at approximately apparent magnitude 11. It passed 0.44 AU (66 million km) from Earth on 12 June 2021. Before that it came to perihelion on 30 January 2015 with a solar elongation of 24 degrees.
Jean Louis Pons (Marseille) originally discovered the comet on 12 June 1819, it was later rediscovered by Friedrich August Theodor Winnecke (Bonn) on 9 March 1858. It is the parent body of the June Bootids of late June.
7P has an orbital period of 6.3 years. It currently has a perihelion of 1.2 AU (outside the orbit of Earth) and an aphelion of 5.6 AU (past the orbit of Jupiter). It passed within 0.04 AU (6.0 million km; 16 LD) of Earth in June 1927, and 0.1 AU (15 million km) in 1939; but it will not come as close in the 21st century. A close approach to Jupiter in July 2037 will drop perihelion to 0.982 AU, and by 2062 perihelion will be further reduced to 0.85 AU.
| Date & time of closest approach |
Earth distance (AU) |
Sun distance (AU) |
Velocity wrt Earth (km/s) |
Velocity wrt Sun (km/s) |
Uncertainty region (3-sigma) |
Reference |
|---|---|---|---|---|---|---|
| 2062-Jun-12 18:25 ± 10 min | 0.1676 AU (25.07 million km; 15.58 million mi; 65.2 LD) | 0.8499 AU (127.14 million km; 79.00 million mi; 330.8 LD) | 16.3 | 42.5 | ± 312 km | Horizons |
The comet nucleus is estimated at about 5.2 km in diameter.