R-type asteroid

R-type asteroids are moderately bright, relatively uncommon inner-belt asteroids that are spectrally intermediate between the V and A-type asteroids. The spectrum shows distinct olivine and pyroxene features at 1 and 2 micrometres, with a possibility of plagioclase. Shortwards of 0.7 μm the spectrum is very reddish.

The IRAS mission has classified 4 Vesta, 246 Asporina, 349 Dembowska, 571 Dulcinea and 937 Bethgea as type R; however, the re-classification of Vesta, the V archetype, is debatable. Of these bodies, only 349 Dembowska is recognized as being type R when all wavelengths are taken into account.

List

As of February 2019, at least 5 asteroids have been classified as R-type:{{cite web

|title=JPL Small-Body Database Search Engine: spec. type = R (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=R;table_format=HTML;max_rows=10;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}}

colspan=4 style="font-weight: normal; padding: 8px; font-size: smaller;" \| Diameter: averaged estimates only; may change over time
class="wikitable" ! Designation !! Class !! Diam.	Refs
349 Dembowska	{{small\|main-belt}}	{{small\|139.77 km}}	{{small\|{{MPC\|349}}{{·}}{{JPL\|349}}}}
1904 Massevitch	{{small\|main-belt}}	{{small\|13.503 km}}	{{small\|{{MPC\|1904}}{{·}}{{JPL\|1904}}}}
2371 Dimitrov	{{small\|main-belt}}	{{small\|7.465 km}}	{{small\|{{MPC\|2371}}{{·}}{{JPL\|2371}}}}
5111 Jacliff	{{small\|main-belt}}	{{small\|6.447 km}}	{{small\|{{MPC\|5111}}{{·}}{{JPL\|5111}}}}
(257838) 2000 JQ66	{{small\|Amor}}	{{small\|0.78 km}}	{{small\|{{MPC\|257838}}{{·}}{{JPL\|257838}}}}

colspan=4 style="font-weight: normal; padding: 8px; font-size: smaller;" \| Diameter: averaged estimates only; may change over time
class="wikitable" ! Designation !! Class !! Diam.	Refs
349 Dembowska	{{small\|main-belt}}	{{small\|139.77 km}}	{{small\|{{MPC\|349}}{{·}}{{JPL\|349}}}}
1904 Massevitch	{{small\|main-belt}}	{{small\|13.503 km}}	{{small\|{{MPC\|1904}}{{·}}{{JPL\|1904}}}}
2371 Dimitrov	{{small\|main-belt}}	{{small\|7.465 km}}	{{small\|{{MPC\|2371}}{{·}}{{JPL\|2371}}}}
5111 Jacliff	{{small\|main-belt}}	{{small\|6.447 km}}	{{small\|{{MPC\|5111}}{{·}}{{JPL\|5111}}}}
(257838) 2000 JQ66	{{small\|Amor}}	{{small\|0.78 km}}	{{small\|{{MPC\|257838}}{{·}}{{JPL\|257838}}}}

R-type asteroid

List

References

See also