π-Puppids (PPU) - 15-28 Απριλίου '09 (Μέγιστο 23 Απριλίου)

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πηγη imo.net

π-Puppids (PPU)

http://www.imo.net/calendar/2009#aprjun

Active: April 15-28

Maximum: April 23 16h UT (λo = 33°5)

ZHR = periodic - up to around 40

Radiant: α = 110° δ = -45°

Radiant drift: see Table 6

v∞ = 18 km/s; r = 2.0

TFC: α = 135° δ = -55° and α = 105° δ = -25° (β < 20° N)

 

Activity has only been detected from this source since 1972, with notable, short-lived, shower maxima of around 40 meteors per hour in 1977 and 1982, both years when its parent comet, 26P/Grigg-Skjellerup was at perihelion. Before 1982, little activity had been seen at other times, but in 1983, a ZHR of ~ 13 was reported, perhaps suggesting material has begun to spread further along the comet's orbit, as theory predicts. Comet Grigg-Skjellerup's most recent perihelion in 2008 March produced nothing meteorically significant that April, but lunar circumstances in 2008 were poor, and faint-meteor activity (which was predicted as likely in advance) could have been missed. There were no predictions for activity in force for 2009 when this Calendar was prepared. The π-Puppids are best seen from the southern hemisphere, with useful observations mainly practical there before midnight, as the radiant is very low to setting after 1h local time. April's new Moon on the 25th creates perfect viewing circumstances this year. Covering whatever happens is important in all years, even if that is to report no obvious activity, as past datasets on the shower have typically been very patchy. So far, visual and radio data have been collected on the shower, but the slow, sometimes bright nature of the meteors makes them ideal subjects for imaging too. No telescopic or video data have been reported in any detail as yet.

http://www.imo.net/calendar/2009#aprjun