IAU 331 · AHY
alpha Hydrids
Measurements from the IAU Meteor Data Center. Each parameter set describes an observation campaign; values and proposed parent bodies may differ between sets.
An activity peak is expressed as solar longitude, not a guaranteed calendar date or observing forecast. Radiant coordinates and orbital elements are reported as supplied by the source. Missing values are not reported; these data do not predict an hourly meteor rate.
5 parameter sets returned for this shower. List-page filters do not hide sets here.
Parameter set 0
- MDC status code
- 1
- MDC status
- single established shower, group
- Activity
- 2002/06
- Shower group
- 00000
- Peak solar longitude
- 285.5 °
- Radiant right ascension
- 127.6 °
- Radiant declination
- -7.9 °
- Right ascension drift
- 0.65 °/day
- Declination drift
- -0.17 °/day
- Geocentric speed
- 43.6 km/s
- Semimajor axis
- 12.7 AU
- Perihelion distance
- 0.287 AU
- Eccentricity
- 0.9774
- Argument of perihelion
- 115.6 °
- Ascending node
- 105 °
- Inclination
- 57.1 °
- Observed members
- 193
- Technique
- R
- Submitted on
- SD
- Reported parent body
- Not reported
Reference: 1) Brown et al., 2008
Source: IAU Meteor Data Center (Jenniskens et al. 2020; Hajdukova & Rudawska)
Parameter set 1
- MDC status code
- 1
- MDC status
- single established shower, group
- Activity
- annual
- Shower group
- 00000
- Peak solar longitude
- 279 °
- Radiant right ascension
- 124.9 °
- Radiant declination
- -7.7 °
- Right ascension drift
- 0.45 °/day
- Declination drift
- -0.1 °/day
- Geocentric speed
- 44.2 km/s
- Semimajor axis
- Not reported
- Perihelion distance
- Not reported
- Eccentricity
- Not reported
- Argument of perihelion
- Not reported
- Ascending node
- Not reported
- Inclination
- Not reported
- Observed members
- 38
- Technique
- T
- Submitted on
- SD
- Reported parent body
- Not reported
Reference: 2) SonotaCo, 2009
Source: IAU Meteor Data Center (Jenniskens et al. 2020; Hajdukova & Rudawska)
Parameter set 2
- MDC status code
- 1
- MDC status
- single established shower, group
- Activity
- annual
- Shower group
- 00000
- Peak solar longitude
- 280 °
- Radiant right ascension
- 125.9 °
- Radiant declination
- -7.9 °
- Right ascension drift
- 0.6 °/day
- Declination drift
- -0.14 °/day
- Geocentric speed
- 43.4 km/s
- Semimajor axis
- Not reported
- Perihelion distance
- Not reported
- Eccentricity
- Not reported
- Argument of perihelion
- Not reported
- Ascending node
- Not reported
- Inclination
- Not reported
- Observed members
- 187
- Technique
- T
- Submitted on
- SD
- Reported parent body
- Not reported
Reference: 3) Molau and Rendtel, 2009
Source: IAU Meteor Data Center (Jenniskens et al. 2020; Hajdukova & Rudawska)
Parameter set 3
- MDC status code
- 1
- MDC status
- single established shower, group
- Activity
- 2002/08
- Shower group
- 00000
- Peak solar longitude
- 286 °
- Radiant right ascension
- 128.5 °
- Radiant declination
- -8.6 °
- Right ascension drift
- 0.64 °/day
- Declination drift
- -0.12 °/day
- Geocentric speed
- 43.2 km/s
- Semimajor axis
- 8.62 AU
- Perihelion distance
- 0.291 AU
- Eccentricity
- 0.966
- Argument of perihelion
- 115.64 °
- Ascending node
- 106 °
- Inclination
- 57 °
- Observed members
- 770
- Technique
- R
- Submitted on
- SD
- Reported parent body
- Not reported
Reference: 4) Brown et al., 2010
Source: IAU Meteor Data Center (Jenniskens et al. 2020; Hajdukova & Rudawska)
Parameter set 4
- MDC status code
- 1
- MDC status
- single established shower, group
- Activity
- annual
- Shower group
- 00000
- Peak solar longitude
- 284 °
- Radiant right ascension
- 126.9 °
- Radiant declination
- -8.7 °
- Right ascension drift
- 0.87 °/day
- Declination drift
- -0.24 °/day
- Geocentric speed
- 43.3 km/s
- Semimajor axis
- 7.07 AU
- Perihelion distance
- 0.297 AU
- Eccentricity
- 0.971
- Argument of perihelion
- 114.6 °
- Ascending node
- 103.2 °
- Inclination
- 58.1 °
- Observed members
- 119
- Technique
- T
- Submitted on
- SD
- Reported parent body
- Not reported
Reference: 5) Jenniskens et al., 2016, Icarus, 266, 331
Source: IAU Meteor Data Center (Jenniskens et al. 2020; Hajdukova & Rudawska)