Draconids(GIA) 2008 6-10 Οκτωβριου (Μεγιστο 8 Οκτωβριου)

[Bi2L]

πηγη imo.net

 

Draconids(GIA)

 

Active: October 6 — 10

Maximum: October 8 10h30m UT (λsol = 195°4 but see below)

ZHR = periodic up to storm levels

Radiant: α = 262° δ = +54°

Radiant drift: negligible

vinf = 20 km/s; r = 2.6

TFC: α = 290° δ = +65° and α = 288° δ = +39° (β > 30° N)

 

 

The Draconids are primarily a periodic shower which produced spectacular, brief, meteor storms twice last century, in 1933 and 1946, and lower rates in several other years (ZHRs ~ 20 — 500+). Most detected showers were in years when the stream's parent comet, 21P/Giacobini-Zinner, returned to perihelion, as it did last in 2005 July. Its orbital period is currently about 6.6 years. In 2005 October, a largely unexpected outburst happened near the comet's nodal crossing time, around λsol = 195°40 — 195°44, probably due to material shed in 1946. Visual ZHRs were ~ 35, though radar detections suggested a much higher estimated rate, closer to ~ 150. The peak was found in radio results too, but it did not record especially strongly that way. Outlying maximum times from the recent past have spanned from λsol = 195°075 (in 1998; EZHRs ~ 700), equivalent to 2008 October 8, 02h40m UT, through the nodal passage time above, to λsol = 195°63 — 195°76 (a minor outburst in 1999, not a perihelion-return year; ZHRs ~ 10 — 20), equating to 2008 October 8, 16h — 19h30m UT. The radiant is circumpolar from many northern hemisphere locations, but is higher in the pre-midnight and near-dawn hours of early October. For such sites, the waxing gibbous Moon sets between ~ 21h — 23h local solar time on October 7/8 and between ~ 23h — 00h on October 8/9, meaning the second part of the night is available for dark-sky checking, whatever the shower may yield — even if that is nothing detectable. Draconid meteors are exceptionally slow-moving, a characteristic which helps separate genuine shower meteors from sporadics accidentally lining up with the radiant.

 

Φωτογραφια για το ετος 2000

(ΟΧΙ 2008)

[ammonite]

Ενδιαφέρον!

Προς τα που πρέπει να κοιτάμε για να δούμε κάτι?

[Bi2L]

Καλησπερα Χρηστο,

 

Τους Δρακονιδες μπορεις να τους δεις (θεωρητικα) σε ολο τον ουρανιο θολο (οπως και ολες τις βροχες διαττοντων)....απλα θα τους βλεπεις να πεφτουν απο τον Αστερισμο του Δρακου (αν προεκτασεις την ουρα τους).

 

Τωρα δεν ξερω αν θα ειναι τοσο θεατικοι οσο οι Περσιδες.....Θα το διαπιστώσουμε

 

 

 

 

Εχε υποψη σου οτι τις ιδιες μερες πεφτουν και οι Ταυριδες...για να τους ξεχωρισεις...απλα δες απο που πεφτουν.

 

 

 

Και αν θελουμε να κανουμε καταγραφη των Διαττοντων απλα γραφουμε το Μεγεθος την φωτηνοτητας (οπως με τα αστερια, πχ 2ου βαθμου) και απο πια βροχη ειναι (Thanks Γρηγόρη - RaQua)

[RaQua]

Draconids (DRA) 2009

 

Active: October 6-10

Maximum: October 8 16h40m UT (λo = 195°4) but see text

ZHR = periodic - up to storm levels

Radiant: α = 262° δ = +54°

Radiant drift: negligible

v∞ = 20 km/s; r = 2.6

TFC: α = 290° δ = +65° and α = 288° δ = +39° (β > 30° N)

 

The Draconids are primarily a periodic shower which produced spectacular, brief, meteor storms twice last century, in 1993 and 1946, and lower rates in several other years (ZHRs ~ 20-500+). Most detected showers were in years when the stream's parent comet, 21P/Giacobini-Zinner, returned to perihelion, as it did last in 2005 July. Its orbital period is currently about 6.6 years. In 2005 October, a largely unexpected outburst happened near the comet's nodal crossing time, around λo = 195°40-195°44, probably due to material shed in 1946. Visual ZHRs were ~ 35, though radar detections suggested a much higher estimated rate, closer to ~ 150. The peak was found in radio results too, but it did not record especially strongly that way. Outlying maximum times from the recent past have spanned from λo = 195°075 (in 1998; EZHRs ~ 700), equivalent to 2009 October 8, 8h45m UT, through the nodal passage time above, to λo=195°63-195°76 (a minor outburst in 1999, not a perihelion-return year; ZHRs ~ 10-20), equating to 2009 October 8, 22h15m to October 9, 1h30m UT. The radiant is circumpolar from many northern hemisphere locations, but is higher in the pre-midnight and near-dawn hours of early October. For such sites, the waning gibbous moonrise allows a short dark-sky interval after dusk for observing on both dates. Draconid meteors are exceptionally slow-moving, a characteristic which helps separate genuine shower meteors from sporadics accidentally lining up with the radiant.

===================================================

 

Αν και θα έχουμε σημαντική Σελήνη αυτές τις μέρες είναι καλό να πραγματοποιηθούν παρατηρήσεις για τους Δρακοντίδες μια και αναμένεται μια μεγάλη βροχή το 2011 οπότε παρατηρήσεις (ακόμα και αρνητικών καταγραφών) προηγούμενων ετών θα βελτιώσουν τα μοντέλα και την πρόβλεψη σαφώς.

 

Φιλικά, Γρηγόρης

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υγ Λοιπή δραστηριότητα αυτής της εβδομάδας (3-10/10/2009):

Draconids (GIA) - 17:28 (262) +56 Velocity - 19km/sec.

Northern Hemisphere - <1 per hr. Southern Hemisphere - <1 per hr.

 

October Epsilon Piscids (OPC) - 00:05 (002) +14 Velocity - 19km/sec.

Northern Hemisphere - <1 per hr. Southern Hemisphere - <1 per hr.

 

Southern Taurids (STA) - 01:46 (026) +08 Velocity - 29km/sec.

Northern Hemisphere - 1 per hr. Southern Hemisphere - 1 per hr.

 

Orionids (ORI) - 05:28 (082) +16 Velocity - 67km/sec.

Northern Hemisphere - <1 per hr. Southern Hemisphere - <1 per hr.

 

October Camelopardalids (OCT) - 11:13 (110) +79 Velocity - 45km/sec.

Northern Hemisphere - <1 per hr. Southern Hemisphere - <1 per hr.

[Bi2L]

Δυστυχως την εχασα αυτη την βροχη...μιας και οι υποχρεωσεις στην δουλεια δεν μου αφησαν παλλα περιθωρια....

 

Καταφερε κανεις να δει κατι, κανετε καμια μετρηση;;;

[RaQua]

Βασίλη, έκανα παρατήρηση νωρίς το βράδυ αλλά δυστυχώς δεν είχε καθόλου δραστηριότητα (αλλά ...καθόλου!!). Οι Δρακοντίδες ήταν στο αναμενόμενο <1 διάττοντα την ώρα οπότε και το αποτέλεσμα της βραδιάς μετά από 1.5 ώρα παρατήρησης ήταν 3 σποραδικοί μαζί με ένα εντυπωσιακό (όχι σε μέγεθος ) διάττοντα μετά το τέλος.

 

Ακολουθεί η αναφορά όπως προκύπτει από την αντίστοιχη online φορμα του ΙΜΟ.

 

Γρηγόρης