Andromedids
General data
| Shower | Andromedids |
|---|---|
| IAU Shower Number | 18 |
| IMO Acronym | AND |
| Activity interval | Sep 25 - Dec 6 |
| Date of maximum in 2010 | November 6 |
| Geocentric Velocity | 17 km/s |
| Population index | 3.6 |
Notes:
- Population index gives the magnitude distribution of the shower meteors: indexes below 2.5 correspond to distributions where bright meteors are more frequent than average, while values over 3.0 mean that the fraction of faint meteors is larger than usual.
Description
Historic shower coming from comet 3D/Biela, that broke in pieces between 1842 and 1846. After giving rise to meteor storms during 19th century, nowadays the swarm is departing from Earth, although part of the swarm still produces a small activity, including some fireballs.
Being a very young swarm coming from the disintegration of a cometary nucleus, it is evolving rapidly and this explains the huge activity interval shown by the ephemerides. Radiant position has a large uncertainty, especially near the edges of the activity interval.
Radiant position and activity
Local circumstances have been computed for latitude ? and longitude ?. Click on any of the two coordinates to set them manually with a map.
| Date | R.A. | Decl. | ZHR | Rise | % moon |
|---|---|---|---|---|---|
| Maximum | 23° | 31° | - | 0 | |
| September 7 (0h UTC) | Inactive | ||||
Meaning of columns is the following:
- R.A. and Decl.: Right ascension and declination of radiant at maximum, referred to ICRS. ICRS is the reference system used by modern star catalogs.
- ZHR: Zenith Hourly Rate. It is the maximum number of meteors that an observer could see under ideal conditions, with clear skies and the radiant at zenith.
- Rise: Time of geometric rise of the radiant, expressed in local time. Symbol * means that the radiant is circumpolar for your latitude.
- % Moon: Percentage of Moon's illumination at 0h UTC of the given date.
If you are in doubt about these concepts, please visit the meteor area.