IAU 225 · SOR
sigma Orionids
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.
2 parameter sets returned for this shower. List-page filters do not hide sets here.
Parameter set 0
- MDC status code
- 0
- MDC status
- single shower, working list
- Activity
- annual
- Shower group
- 00000
- Peak solar longitude
- 191.7 °
- Radiant right ascension
- 86 °
- Radiant declination
- -3 °
- Right ascension drift
- Not reported
- Declination drift
- Not reported
- Geocentric speed
- 65 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
- Not reported
- Technique
- Not reported
- Submitted on
- SD
- Reported parent body
- Not reported
Reference: 1) IMO 1995
Source: IAU Meteor Data Center (Jenniskens et al. 2020; Hajdukova & Rudawska)
Parameter set 1
- MDC status code
- 0
- MDC status
- single shower, working list
- Activity
- annual
- Shower group
- 00000
- Peak solar longitude
- 187 °
- Radiant right ascension
- 87.9 °
- Radiant declination
- 0.5 °
- Right ascension drift
- 0.92 °/day
- Declination drift
- 0.01 °/day
- Geocentric speed
- 66.2 km/s
- Semimajor axis
- 9.7 AU
- Perihelion distance
- 0.934 AU
- Eccentricity
- 0.919
- Argument of perihelion
- 30.6 °
- Ascending node
- 9.6 °
- Inclination
- 139.7 °
- Observed members
- 40
- Technique
- T
- Submitted on
- SD
- Reported parent body
- Not reported
Reference: 2) Jenniskens et al., 2016, Icarus, 266, 331
Source: IAU Meteor Data Center (Jenniskens et al. 2020; Hajdukova & Rudawska)