Taurids(ΝTA)STA: 25 Σεπ. ως 25 Nοε. Μέγ: 5 & 12 Νοε.'10

[Bi2L]

Taurids(STA)(NTA)

 

πηγη imo.net

http://www.imo.net/calendar/2010#sta

 

 

Southern Taurids (STA)

Active: September 25–November 25;

Maximum: November 5 (λˆ = 223°);

ZHR = 5;

Radiant: α = 52°, δ = +15°;

Radiant drift: see Table 6;

V∞ = 27 km/s; r = 2.3;

TFC: Choose fields on the ecliptic and ∼ 10° E or W of the radiants (β > 40° S).

 

 

Northern Taurids (NTA)

Active: September 25–November 25;

Maximum: November 12 (λˆ = 230°);

ZHR = 5;

Radiant: α = 58°, δ = +22°;

Radiant drift: see Table 6;

V∞ = 29 km/s; r = 2.3;

TFC: as Southern Taurids.

 

 

These two streams form part of the complex associated with Comet 2P/Encke. Defining their radiants is best achieved by careful visual or telescopic plotting, or imaging recordings, since they are large and diffuse. For shower association, each radiant should be considered an oval area of ~ 20° × 10°, α × δ, centred on the radiant position for any given date. Their activity clearly dominates the ANT's during the northern autumn, so much so that the ANT is considered inactive while they are present. The brightness and relative slowness of many of these shower meteors makes them ideal targets for still-imaging, while these factors coupled with low, steady, combined Taurid rates make them excellent subjects for newcomers to practice their plotting techniques on. The activity of both showers produces an apparently plateau-like maximum for about ten days in early November, and they have a reputation for producing some excellently bright fireballs at times, although seemingly not in every year. Meteoricist David Asher's studies have indicated that increased Taurid fireball rates probably result from a 'swarm' of larger particles within the Taurid stream, which in 2005 most recently produced a lot of, occasionally very brilliant, fireballs, and enhanced combined ZHRs of ~ 10–15 that persisted from about October 29 to November 10. Another 'swarm' return in 2008 gave a less-clear signature, with little or no significant increase in fireball numbers, but probably better than normal Taurid activity, ZHRs ~ 10–20, for a few days in late October and early November. No 'swarm' return is predicted for this year. November's new Moon favours coverage of the whole probable maximum spell however, and with near-ecliptic radiants, all can observe these streams. Northern hemisphere observers are somewhat better-placed, as here suitable radiant zenith distances persist for much of the night. Even from the southern hemisphere, a good 3–5 hours' watching around local midnight is possible with Taurus well above the horizon. The VID data largely confirmed the lengthy active periods for both sources, but suggested the STA might show two minor maxima, around October 31 and November 8, and the NTA three, near October 3, November 9 and 16. Note the first STA and last NTA video peaks originated from radiants respectively some way north and northeast of the expected positions at those times.