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rock > igneous rock > differentiated meteorite > differentiated achondrite > asteroidal achondrite > HED meteorite > howardite > Old Homestead 001

Old Homestead 001
subject			fact

Old Homestead 001	has image
	is an instance of howardite
	is an instance of meteorite find
	has name Homestead 001
	has find date June 1991
	has fall coordinates 31° 10' S., 127° 45' E.
	has fall location Nullarbor Plain, Western Australia
	has mass 0.783 kg
howardite	has letter designation AHOW
	has characteristic mineral eucrite-diogenite mixture
	has total mass of finds 41 kg
	has number of finds 19
meteorite find	has value lower because the fall was not witnessed
	has weathering can be severe due to long exposure time to environmental corrosion agents
HED meteorite	is an acronym for Howardite, Eucrite, Diogenite
	has origin 4 Vesta
	has minerology orthopyroxene, olivine, chromite; pigeonite, calcic plagioclase, silica
	has petrology coarse-grained orthopyroxenites, gabbros, fine- to coarse-grained basalts, brecciated
	has likely origin cumulates, crystallized melts, impact mixing
meteorite	has fall date recorded by eyewitness or inferred from dating methods
	has fall map which appears as an elongated footprint which depends on impact angle, airbursts, and impact velocity
	can have crater image
	has original mass which can over an order of magnitude greater than total mass of fragment(s) collected at the impact site
	has composition often minerals not found on Earth
	has relative abundance
	has impact velocity when it hits the ground which is smaller than its velocity before it enters the atmosphere
	has impact angle
	has weather resistance which depends on its composition
	has monetary value large if the fall was witnessed
	often produce power outages and failures in electrical equipment due to EMP (electromagnetic pulse)
	can be associated with crater
	has origin meteoroid from interplanetary space or fragment dislodged from another planet, moon or planetesimal
	vaporizes completely if size is between 3 micrometers and 3 millimeters
	can survive fall if size is larger than 3 mm and velocity is less than 24 km per second
	can survive fall if it fragments because smaller pieces with less mass are more easily slowed by the atmosphere
	has ablative mass loss depending on composition, more friable stony meteoroids loses more mass than iron meteoroid
	has ablative mass loss directly proportional to initial velocity
	can shatter during impact phase
	can fragment during meteor phase
	has fragmentation probability during meteor phase which depends on composition
rock	has part mineral
	has texture
	has genesis
achondrite	has distinguishing feature no chondrules
igneous rock	has solidification mechanism
	has solidification timescale

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