Νότιοι δ-Υδροχοΐδες(SDA): 12 Ιούλ. ως 23 Αυγ. Μέγ:30 Ιουλίου

[Bi2L]

Νότιοι δ-Υδροχοΐδες(SDA) - Southern δ-Aquariids (SDA)

πηγη imo.net

http://www.imo.net/files/data/calendar/cal2013.pdf

Active: July 12;August 23; Maximum: July 30 (λ ;= 127 ); ZHR = 16;

Radiant: α = 340 ; , δ = −16 ◦ ; Radiant drift: see Table 6; V= 41 km/s; r = 3.2;

TFC: α = 255 ; ; to 0 ; , δ = 0 ; to +15 2; ; ,

choose pairs separated by about 30 ;

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 enjoys a longer

dark-sky spell before last quarter moonrise for its likely peak than the PAU, albeit the maximum

may not be quite so sharp as the single date here might imply, with perhaps similar ZHRs from

July 28 11;30. Its rates have been suspected of some variability at times too, though not in more

recent investigations.

 

 

 

Εδω μερικές παραπάνω πληροφορίες

http://meteorshowersonline.com/showers/delta_aquarids.html

 

 

Για έμπειρους **---