Baptistina family

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298 Baptistina (center), one of the largest presumed remnants of the Baptistina family. Here it is shown flanked on either side by two bright stars in the background.

The Baptistina family (

Chicxulub impactor was part of the Baptistina family of asteroids, but this was disproven in 2011 using data from the Wide-field Infrared Survey Explorer
(WISE).

The Baptistina family consists of darkly colored asteroids and meteoroids in similar orbits. Baptistina broke up into thousands of fragments about 80 million years ago.[3]

Members

298 Baptistina
Discovery
Synodic rotation period
X-type
11.2

Baptistina (

minor planet designation: 298 Baptistina) is the namesake asteroid and largest presumed remnant of the Baptistina family. It was discovered on 9 September 1890 by Auguste Charlois at the Nice Observatory. The source of its name is unknown.[7] It measures about 13 to 30 kilometres (8 to 19 mi) in diameter. Although it has an orbit similar to the Flora family asteroids, Baptistina is an unrelated interloper.[8][verification needed
]

Other members of the Baptistina family include

2858 Carlosporter, and (7255) 1993 VY1.[1]

Orbit of 298 Baptistina

Composition

It was originally thought that the Baptistina family may consist of uncommon carbonaceous chondrite. In 2006, nine asteroids within the Baptistina family were given known classifications: three are S-type asteroids, two are X-type asteroids, another two are A/R-type asteroids, one is C-type and one is V-type. However, any conclusions taken from this were highly speculative, as very few members in the family were classified, and not even the albedo of the meteors was known at the time.[1]

Following the impact of the Chelyabinsk meteor in 2013, a paper published in the journal Icarus showed that shock produced during impact of a large asteroid can darken otherwise bright silicate material. Spectral analysis of the darkly-colored portions of the non-carbonaceous Chelyabinsk meteorite closely matched the color of members of the Baptistina family, showing that a low albedo does not necessarily indicate the composition of the family.[9]

Formerly proposed impacts

In 2007, it was proposed that

Venusian craters Mead, Isabella, Meitner, and Klenova.[11]

In 2011, data from the

Near Earth Object Observation Program.[13]

References

  1. ^
    doi:10.1051/0004-6361:20065518
    . Retrieved 21 April 2018.
  2. S2CID 119280014
    .
  3. ^ a b Plotner, Tammy (2011). "Did Asteroid Baptistina Kill the Dinosaurs? Think other WISE..." Universe Today. Retrieved 19 September 2011.
  4. ^ a b "298 Baptistina". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 11 May 2016.
  5. ^ a b Reddy V., et al. (2008). Composition of 298 Baptistina: Implications for K–T Impactor Link, Asteroids, Comets, Meteors conference.
  6. ^ a b c Majaess D., Higgins D., Molnar L., Haegert M., Lane D., Turner D., Nielsen I. (2008). New Constraints on the Asteroid 298 Baptistina, the Alleged Family Member of the K/T Impactor Archived 14 June 2017 at the Wayback Machine, accepted for publication in the JRASC
  7. ISBN 978-3-540-00238-3
    .
  8. ^ M. Florczak et al. A Visible Spectroscopic Survey of the Flora Clan, Icarus Vol. 133, p. 233 (1998)
  9. ^ "Russian meteorite sheds light on dinosaur extinction mystery". phys.org. 17 July 2014.
  10. S2CID 4322622
    .
  11. ^ a b Govert Schilling. "Asteroids Smash, Dinosaurs Duck". Archived from the original on 27 September 2007. Retrieved 5 September 2007.
  12. ^ "Breakup event in the main asteroid belt likely caused dinosaur extinction 65 million years ago". phys.org. 5 September 2007.
  13. ^ "Asteroid didn't do it – so who killed the dinosaurs? NASA rules out Baptistina theory". News.com.au / Fox. 2011. Retrieved 29 February 2012.

External links

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