Updated:2013-08-22

Meteorite Action!

1977-02-05 : Innisfree (Canada)

Spatial and Temporal Informations

Location of fall
Innisfree (Alberta, Canada)
Coordinates
5324'53" N, -11120'14" E
Date of fall
February 5, 1977 19h 17mn 38s LT
February 6, 1977 02h 17mn 38s UT
Fireball duration
4.09 s
Initial velocity
14.54 km/s
Start height of bolide
72 km
Terminal height of bolide
21 km
Fireball terminal velocity
4.70 km/s
Trajectory slope (// horizontal)
67.8

Physical and kinetics Informations

Maximum absolute magnitude
-12.1 ( 36 km of height )
Pre-atmospheric mass of the meteoroid
20 kg
Total known weight (TKW)
4.58 kg (until 1977 )
9 fragments:
  • February 17, 1977 : 2070 g
  • April 9, 1977 : 33 g
  • April 10, 1977 : 120 g et 345 g
  • April 11, 1977 : 894 g
  • April 21, 1977 : 330 g
  • May 1, 1977 : 22 g
  • May 3, 1977 : 387 g
  • May 8, 1977 : 375 g
Density
3.5 g cm-3
Classification
Ordinary chondrite LL5 (with Hypersthene)

Orbital

Semimajor axis (a)
1.872 UA
Inclination (i)
12.27
Eccentricity (e)
0.4732
Longitude of ascending nodet (W)
316.80
Argument of perihelion (w)
177.97
Perihelion distance (q)
0.986 UA
Aphelion distance (Q)
2.758 UA
TXT_VUE_DESSUS
Vue parallele au grand axe
Vue parallele  la ligne des noeuds

Reference

The innisfree meteorite fall: a photographic analysis of fragmantation, dynamics and luminosity
I. Halliday, A. Griffin, A. Blackwell
Meteoritics and Planetary Science. Supplement 16 [2] (1981), pp. 153-170
The Innisfree meteorite and the canadian camera network
I. halliday, A. Blackwell, A. Griffin
Journal Royal Astronomical Society of Canada 12 [1] (1978), pp. 15-39