η-Aquariids Meteor Showers (Peak time and Condition)

2021-03-09

η-Aquariids is one of major meteor showers in southern observers. In 2012 and 2013, a little strong activity were observed in the world. Since &eta-Aquariids is a relatively broad maximum, clear activity continues for a few days. The maximum occurs at λ_⊙=45°.5 by The International Meteor Organization. Radio Meteor Observations is also possible to see its activities. The maximum is observed around λ_⊙=44°.5. It is a possibility of influence of May Daytime Meteor Showers after η-Aquariids activity.

Contents

1. Information of η-Aquariids
- 1.1. Reference and Useful Links
2. Conditions in the future (2021-2025) for Radio Meteor Observations
- 2.1. Conditions in North America
- 2.2. Conditions in Other region
3. Results of η-Aquariids by Radio Meteor Observations

Information of η-Aquariids

Name (code)		η-Aquariids (031 ETA)
Active	Visual(IMO)	19^th April – 28^th May
Active	Radio(IPRMO)	29^th April – 11^th May
Maximum	Visual(IMO)	λ_⊙=45°.5
Maximum	Radio(IPRMO)	λ_⊙=44°.5
Radiant		α = 338° / δ = -1°
feature		ZHR(max):60, r=2.4, V_∞:66km/s Radio) Maximum Activity Level=1.0 FWHM:-1°.50/+5°.10
Parant Comet		1P/Halley

Reference and Useful Links

– 2021 Meteor Shower Calendar (International Meteor Organization)
– A new Working List of meteor showers (Rainer Arlt et al), WGN 34:3(2006)
– Meteor Shower Workbook 2014 (J.Rendtel) ? International Meteor Organization (2014)
– Major and Daytime Meteor Showers using Radio Meteor Observation in the World covering the period 2001-2016(H.Ogawa and C.Steyaert), WGN 45:4(2017)
– The American Meteor Society (AMS)

Conditions in the future (2021-2025) for Radio Meteor Observations

Below lists are observig conditions for radio meteor observers in 2021, 2022, 2023, 2024 and 2025. This is listed for radio observers (NOT for visual observers). You can see visual observing conditions as following AMS site.
Conditions for Visual Observers (by AMS)

Conditions in North America

Time : Daylite-Saving Time

Year	Peak Time and Condition (λ_⊙=45°.5)					Comments for Radio Obs.
Year	AST(ADT)	EST(EDT)	CST(CDT)	MST(MDT)	PST(PDT)	Comments for Radio Obs.
Year	Peak Time and Condition (λ_⊙=45°.5)
2021	May 5^th 23^h	May 5^th 22^h	May 5^th 21^h	May 5^th 20^h	May 5^th 19^h	peak occurs under horizon
2022	May 5^th 05^h	May 5^th 04^h	May 5^th 03^h	May 5^th 02^h	May 5^th 01^h	better condition at eastern
2023	May 5^th 11^h	May 5^th 10^h	May 5^th 09^h	May 5^th 08^h	May 5^th 07^h	Best condition !
2024	May 5^th 18^h	May 5^th 17^h	May 5^th 16^h	May 5^th 15^h	May 5^th 14^h	peak occurs under horizon
2025	May 6^th 00^h	May 5^th 23^h	May 5^th 22^h	May 5^th 21^h	May 5^th 20^h	peak occurs under horizon

Major cities (example)
AST(Halifox, etc.), EST(NewYork,Ottawa, etc.), CST(Cicago, etc.), MST(Denver, etc.), PST(LosAngeles, etc.)

Conditions in Other region

Time : Standard Time (NOT daylight-saving time)

Year	Peak Time and Condition (λ_⊙=45°.5)				Comments for Radio Obs.
Year	GMT(UK)	CET(Italy)	IST(India)	JST(Japan)	Comments for Radio Obs.
Year	Peak and Condition (λ_⊙=45°.5)
2021	May 6^th 02^h	May 6^th 03^h	May 6^th 07^h	May 6^th 11^h	best condition in Asia
2022	May 6^th 08^h	May 6^th 09^h	May 6^th 13^h	May 6^th 17^h	better condition in Europe
2023	May 6^th 14^h	May 6^th 15^h	May 6^th 19^h	May 6^th 23^h	peak occuers under horizon
2024	May 5^th 21^h	May 5^th 22^h	May 6^th 02^h	May 6^th 06^h	East Asia is best condition
2025	May 6^th 03^h	May 6^th 04^h	May 6^th 08^h	May 6^th 12^h	East Europe is better

GMT:United Kingdom, CET:Itarly, IST:India, JST:Japan

Results of η-Aquariids by Radio Meteor Observations

Result of η-Aquariids is recorded by worldwide radio meteor observers.
Result of η-Aquariids

Posted by h-ogawa