Southern δ-Aquariids(SDA)12 Ιουλίου-19Αυγ/στου-MAX 28 Ιουλίο

[Bi2L]

Southern δ-Aquariids (SDA)

πηγη imo.net

Active: July 12-August 19

Maximum: July 28 (λo = 125°)

ZHR = 20

Radiant: α = 339° δ = -16°

Radiant drift: see Table 6

v∞ = 41 km/s; r = 3.2

TFC: α = 255° to 0° δ = 0° to +15°

choose pairs separated by about 30° in α (β < 40° N)

 

Like the PAU and ANT, SDA meteors are often faint, thus are suitable targets for telescopic observing, although enough brighter members exist to make visual and imaging observations worth the effort too, primarily from more southerly sites. Radio work can pick up the SDA as well, and indeed the shower has sometimes given a surprisingly strong radio signature. Careful visual plotting is advised, to help with accurate shower association. The SDA/PAU/ANT/CAP radiants are well above the horizon for much of the night, and the SDA enjoys identical dark-sky conditions in the second half of the nights near its maximum to the PAU. Its peak may not be quite so sharp as the single date here might imply, with perhaps similar ZHRs from July 28-30. Its rates have been suspected of some variability at times too, though not in the more recent investigations.

 

 

Δειτε και τον Ετησιο Πινακα Διαττοντων 2009 για περισσοτερες Βροχες!