Possible relationship between the Farmington meteorite and a seismically detected swarm of meteoroids impacting the Moon

Oberst, J.

doi:10.1111/j.1945-5100.1989.tb00937.x

Cited by 9 publications

(3 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This author also suggested that Seres may have been in a pre-terrestrial orbit very close to the Sun, which caused a late heating event to several hundred°C, in order to explain the metallographic texture and depletion of cosmogenic noble gases. A similar conclusion has been postulated for Farmington to explain its very young CRE age (e.g., Heymann et al, 1967;Oberst, 1989). Our constraints for a very young CRE age <0.5 Ma imply LAP 031047 was shielded from galactic cosmic rays before $0.5 Ma, possibly because its location was >1-2 m from the surface of its parent asteroid (e.g., Eugster, 2003;Leya and Masarik, 2009) or it was reheated in the last 0.5 Ma.…”

Section: Noble Gas Inferencessupporting

confidence: 61%

H/L chondrite LaPaz Icefield 031047 – A feather of Icarus?

Wittmann

Friedrich

Troiano

et al. 2011

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

Section: Noble Gas Inferencessupporting

confidence: 61%

H/L chondrite LaPaz Icefield 031047 – A feather of Icarus?

Wittmann

Friedrich

Troiano

et al. 2011

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

“…The best direct evidence of a meteorite stream is Halliday's (1987) photographic observations of two meteors, one of which yielded an LL chondrite fall, from the same orbit. Other authors, on less certain evidence, have suggested that there may be streams of H chondrites (Wood, 1982;Dodd, 1992;Wolf and Lipschutz, 1992), L chondrites (Wood and Silliman, 1983;Oberst, 1989) and SNC achondrites (Treiman, 1992). Meteorite falls may also occur in clusters, falls in rapid succession without common or similar fall days.…”

Section: Introductionmentioning

confidence: 99%

“…Meteorite falls may also occur in clusters, falls in rapid succession without common or similar fall days. Clusters of meteoroid impacts have been recognized in data from the Apollo lunar seismic network (Oberst andNakamura, 1987, 1991), although it is possible that these meteoroids are unrelated to the meteorites that fallon Earth.…”

Section: Introductionmentioning

confidence: 99%

An improbable concentration of basaltic meteorite falls (HED and mesosiderite) in the mid‐20th century

Treiman

1993

Meteoritics

View full text Add to dashboard Cite

The fall rate of HED basaltic meteorites (howardites, eucrites, diogenites) has not been constant in the 20th century, while the fall rate of chondrites has been constant within error. Thirteen of the 26 dated HED falls (day of fall known, 1900 through 1989) fell in 1924 through 1939. A fall cluster (not a meteorite stream) like this will occur in less than one in 100 random distributions of fall days. The proportions of HED types in the whole cluster are statistically identical to those of the whole historical record of HED falls, as is the distribution of cosmic ray exposure ages. In a subset of the cluster, 1924 through 1933, eight of those nine HED falls from have exposure ages of 10–20 Ma; this grouping is statistically distinct from that of the historical record. The mesosiderite meteorites share many chemical and isotopic properties with the HEDs but are not from the same parent body. However, the dates of the three mesosiderite falls of the 20th century (all in 1924 through 1939) are a likely sampling of the distribution of HED fall dates; less than one in 200 random distributions of three fall dates would have them all in a given IS year interval of the 20th century. If the concentration of HED and mesosiderite falls in 1924 through 1939 is not a result of chance (odds of less than 1 in 200), it must have had a cause or causes. The cause(s) are not dear but appear(s) to have operated: on parent bodies only of basaltic meteorites; on a number of such parent bodies (mesosiderite and at least one HED); distant from Earth; and so as to produce a duster of only 15 years duration. This duration is much shorter than the expected time scales or orbital evolution of asteroidal fragments.

show abstract

Cometary supply of terrestrial organics: Lessons from the K/T and the present epoch

Steel

1991

Origins Life Evol Biosphere

View full text Add to dashboard Cite

Abstract. The time-scales of import with respect to the physical survival of planet-crossing bodies (asteroids comets, meteoroids, dust) in the inner solar system are considered, and characteristic times for different masses reviewed. These physical lifetimes range from 103-105 yr for dust (masses 10-12-t0 -6 g), and 105-106 yr for small meteoroids (masses 10-6-1 g), to 107-108 yr for larger bodies; bodies with aphelion distance > 4 AU may have dynamical lifetimes lower than these figures due to ejection from the solar system by Jupiter. Values of terrestrial impact velocities and probabilities are given for characteristic orbits of long-and short-period comets, Earth-crossing asteroids, and near-Earth dust. Zodiacal dust particles, which are predominantly in near-circular, low-inclination orbits, have sufficiently low arrival velocities (< 20 km sec -1) at the Earth to make organic survival plausible. Alternatively larger objects with short periods, perihelia near 1 AU, and i ~ 20 °, will also impact at < 20 km sec -1, but their impact probabilities are smaller. This argues for organic delivery predominantly from dust rather than directly through meteoroids, asteroids or comets. Such dust may have delivered the amino acids deposited over at most ~ 105 yr at the K/T boundary: this is also the appropriate time-scale for the hierarchical disintegration of a giant comet and its daughter products, and the accumulation by the Earth of the dust produced, but is too short for deposition by discrete large bodies produced in the disintegration of a large comet. This supports the conjecture that some organics arrived in the first ~ 109 yr of the planet's history as constituents of cometary dust gently decelerated in the atmosphere, allowing survival to the surface.

show abstract

Possible relationship between the Farmington meteorite and a seismically detected swarm of meteoroids impacting the Moon

Cited by 9 publications

References 40 publications

H/L chondrite LaPaz Icefield 031047 – A feather of Icarus?

H/L chondrite LaPaz Icefield 031047 – A feather of Icarus?

An improbable concentration of basaltic meteorite falls (HED and mesosiderite) in the mid‐20th century

Cometary supply of terrestrial organics: Lessons from the K/T and the present epoch

Contact Info

Product

Resources

About