“A-type asteroid”的意思、由来-开放百科全书

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A-type asteroid

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A-type asteroids are relatively uncommon inner-belt asteroids that have a strong, broad 1 µm olivine feature and a very reddish spectrum shortwards of 0.7 µm. They are thought to come from the completely differentiated mantle of an asteroid.

List

A-type asteroids are so rare that as of February 2019, only 17 had been discovered:^[1]

Designation	Class	Diam.	Refs
246 Asporina	main-belt}}	50.891 km}}	{{MPC\|246}}{{·}}{{JPL\|246}}}}
289 Nenetta	main-belt}}	37.586 km}}	{{MPC\|289}}{{·}}{{JPL\|289}}}}
446 Aeternitas	main-belt}}	53.562 km}}	{{MPC\|446}}{{·}}{{JPL\|446}}}}
863 Benkoela	main-belt}}	38.724 km}}	{{MPC\|863}}{{·}}{{JPL\|863}}}}
1126 Otero	main-belt}}	10.974 km}}	{{MPC\|1126}}{{·}}{{JPL\|1126}}}}
1600 Vyssotsky	main-belt}}	7.413 km}}	{{MPC\|1600}}{{·}}{{JPL\|1600}}}}
1951 Lick	Mars-crossing}}	5.57 km}}	{{MPC\|1951}}{{·}}{{JPL\|1951}}}}
2234 Schmadel	main-belt}}	9.473 km}}	{{MPC\|2234}}{{·}}{{JPL\|2234}}}}
2423 Ibarruri	Mars-crossing}}	4.899 km}}	{{MPC\|2423}}{{·}}{{JPL\|2423}}}}
2501 Lohja	main-belt}}	10.218 km}}	{{MPC\|2501}}{{·}}{{JPL\|2501}}}}
2715 Mielikki	main-belt}}	13.252 km}}	{{MPC\|2715}}{{·}}{{JPL\|2715}}}}
2732 Witt	main-belt}}	11.001 km}}	{{MPC\|2732}}{{·}}{{JPL\|2732}}}}
3352 McAuliffe	Amor}}	2.1 km}}	{{MPC\|3352}}{{·}}{{JPL\|3352}}}}
4142 Dersu-Uzala	Mars-crossing}}	7.1 km}}	{{MPC\|4142}}{{·}}{{JPL\|4142}}}}
4713 Steel	main-belt}}	6.286 km}}	{{MPC\|4713}}{{·}}{{JPL\|4713}}}}
4982 Bartini	main-belt}}	7.975 km}}	{{MPC\|4982}}{{·}}{{JPL\|4982}}}}
5641 McCleese	Mars-crossing}}	5.68 km}}	{{MPC\|5641}}{{·}}{{JPL\|5641}}}}
Diameter: averaged estimates only; may change over time

References

1. ^{{cite web |title=JPL Small-Body Database Search Engine: spec. type = A (SMASSII) |publisher=JPL Solar System Dynamics |url=http://ssd.jpl.nasa.gov/sbdb_query.cgi?obj_group=all;obj_kind=all;obj_numbered=all;OBJ_field=0;ORB_field=0;c1_group=OBJ;c1_item=Ax;c1_op=%3D;c1_value=A;table_format=HTML;max_rows=50;format_option=comp;c_fields=AcBhBgBjBiBnBsAiAx;.cgifields=format_option;.cgifields=obj_kind;.cgifields=obj_group;.cgifields=obj_numbered;.cgifields=ast_orbit_class;.cgifields=table_format;.cgifields=com_orbit_class&query=1 |accessdate=2019-03-17}}

External links

Mineralogic and Temperature-Induced Spectral Investigations of A-type Asteroids: (246) Asporina and (446) Aeternitas, V. Reddy, Lunar and Planetary Science XXXVI (2005)

3 : Asteroid spectral classes|A-type asteroids (Tholen)|A-type asteroids (SMASS)

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