26P/Grigg–Skjellerup

26P/Grigg–Skjellerup
26P/Grigg–Skjellerup
Discovery
Discovered by: John Grigg and John Francis Skjellerup
Discovery date: 1902 and 1922
Alternate designations: 1808 C1; 1808 III;
1902 O1; 1902 II;
1902c; 1922 K1;
1922 I; 1922b;
1927 F1; 1927 V;
1927e; 1932 II;
1932d; 1937 III;
1937e; 1942 V;
1942d; 1947 II;
1947a; 1952 IV;
1952b; 1957 I;
1956i; 1961 IX;
1961g; 1967 I;
1966f; 1972 II;
1972b; 1977 VI;
1977b; 1982 IV;
1982a; 1987 X;
1986m; 1992 XVIII
Orbital characteristics A
Epoch: April 10, 2007 (JD 2454200.5)
Aphelion distance: 4.9332 AU
Perihelion distance: 1.1168 AU
Semi-major axis: 3.0437 AU
Eccentricity: 0.6631
Orbital period: 5.31 a
Inclination: 22.36°
Last perihelion: March 23, 2008
Next perihelion: July 6, 2013[1]

Comet Grigg–Skjellerup (formally designated 26P/Grigg–Skjellerup) is a periodic comet.

Discovered in 1902 by John Grigg of New Zealand, and rediscovered in its next appearance in 1922 by John Francis Skjellerup, an Australian then living and working for about two decades in South Africa where he was a founder member of the Astronomical Society of Southern Africa.

In 1987, it was belatedly discovered by Ľubor Kresák that the comet had been observed in 1808 as well, by Jean-Louis Pons.

The comet has often suffered the gravitational influence of Jupiter, which has altered its orbit considerably. For instance, its perihelion distance has changed from 0.77 AU in 1725 to 0.89 AU in 1922 to 0.99 AU in 1977 and to 1.12 AU in 1999.

Having its recent perihelion so close to Earth's orbit made it an easy target to reach for the Giotto mission (spacecraft) in 1992, whose primary mission was to Comet Halley. Giotto had a closest approach to Grigg–Skjellerup of 200 km, much closer than its approach to Comet Halley, but was unable to obtain images as its camera was destroyed during the Halley rendezvous in 1986.

In 1972 the comet was discovered to produce a meteor shower, the Pi Puppids, and its current orbit makes them peak around April 23, for observers in the southern hemisphere, best seen when the comet is near perihelion.

The 2002 return (expected perihelion around October 8, 2002) was very unfavorable and no observations were reported.

The comet nucleus is estimated to be 2.6 kilometers in diameter.[2]

External links

References

Periodic comets (by number)
Previous
25D/Neujmin
26P/Grigg–Skjellerup Next
27P/Crommelin

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  • 26P/Grigg-Skjellerup — 26P/Grigg Skjellerup) Eigenschaften des Orbits (Simulation) Orbittyp kurzperiodisch Numerische Exzentrizität 0,664 Perihel 0,997 AE …   Deutsch Wikipedia

  • 26P/Grigg-Skjellerup — Infobox Comet name=26P/Grigg Skjellerup discoverer=John Grigg and John Francis Skjellerup discovery date=1902 and 1922 designations=1808 C1; 1808 III; 1902 O1; 1902 II; 1902c; 1922 K1; 1922 I; 1922b; 1927 F1; 1927 V; 1927e; 1932 II; 1932d; 1937… …   Wikipedia

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  • 26P — 26P/Grigg Skjellerup) Eigenschaften des Orbits (Simulation) Orbittyp kurzperiodisch Numerische Exzentrizität 0,664 Perihel 0,997 AE …   Deutsch Wikipedia

  • 26P/Григга — Скьеллерупа — Открытие Первооткрыватель: Джон Григг и Джон Скьеллеруп Дата открытия: 23 июля 1902 Альтернативные обозначения: C/1808 C1; 1808 III; C/1902 O1; 1902 II; 1902c; 1922 K1; 1922 I; 1922b; C/1927 F1; 1927 V; 1927e; 1932 II; 1932d; 1937 III; 1937e;… …   Википедия

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  • John Francis Skjellerup — (May 16 1875 ndash; January 6 1952)was an Australian who spent about a decade working as a telegraphist in South Africa, and was an astronomer.Some sources give his name as James Francis Skjellerup; in any case, apparently he preferred to be… …   Wikipedia

  • John Grigg (astronomer) — John Grigg (June 4 1838 ndash; June 20 1920) was a New Zealand astronomer.He was born in London and married Emma Mitchell in 1858. In 1863 they emigrated to New Zealand and settled in Auckland, however Emma died in 1867. Grigg then moved to the… …   Wikipedia

  • John Grigg — (* 4. Juni 1838 in London; † 20. Juni 1920 in Thames (Neuseeland)) war ein britischer Amateur Astronom. Er war ausgebildeter Musiklehrer. 1863 wanderte er nach Neuseeland aus. Am 23. Juli 1902 entdeckte er den Kometen, der später den offiziellen… …   Deutsch Wikipedia

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