(53319) 1999 JM8
Template:Use dmy dates Script error: No such module "infobox".Script error: No such module "Check for unknown parameters".
Template:Mp is an asteroid, slow rotator and tumbler, classified as a near-Earth object and potentially hazardous asteroid (PHA) of the Apollo group, approximately Script error: No such module "convert". in diameter, making it the largest PHA known to exist.[1] It was discovered on 13 May 1999, by astronomers of the Lincoln Near-Earth Asteroid Research at the Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico.[2]
Orbit and classification
Template:Mp orbits the Sun at a distance of 1.0–4.5 AU once every 4 years and 6 months (1,644 days; semi-major axis of 2.73 AU). Its orbit has an eccentricity of 0.64 and an inclination of 14° with respect to the ecliptic.[3] This makes it also a Mars-crossing asteroid.
The body's observation arc begins with its first identification as Template:Mp at Palomar Observatory in April 1990, more than 9 years prior to its official discovery observation at Socorro.[2]
Close approaches
Template:Mp has an Earth minimum orbital intersection distance of Script error: No such module "convert".[3] It passed closer than 0.20 AU to the Earth five times in the last century (0.033 AU in 1990), but its next closest approach in the 21st century will be in 2075 at Script error: No such module "convert". and in August 2137 at Script error: No such module "convert"..[3] For comparison, the planet Venus passed Script error: No such module "convert". from Earth in 2022.
Physical characteristics
In the SMASS and Tholen classification, Template:Mp is an X-type asteroid.[3][4] It has also been characterized as a carbonaceous C-type asteroid, which seems more likely due to its exceptionally low albedo (see below).[5]
Rotation period
Radar imaging by Goldstone and Arecibo observatories revealed that Template:Mp has an unusually slow and possibly chaotic rotation period, similar to that of asteroid 4179 Toutatis.[4][6]
In July 1999, a rotational lightcurve of Template:Mp was obtained from photometric observations. It gave a period of Script error: No such module "val". hours with a brightness amplitude of 0.7 magnitude (U=2Script error: No such module "Check for unknown parameters".), and suggested that the body is in a non-principal axis rotation, commonly known as tumbling.[7]
Diameter and albedo
Template:Mp measures between 5 and 7 kilometers in diameter and its surface has an exceptionally low albedo of 0.02.[8][9][10][11] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.03 and adopts a diameter of 7 kilometers based on an absolute magnitude of 15.2.[4]
Numbering and naming
This minor planet was numbered by the Minor Planet Center on 16 February 2003.[12] As of 2018, it has not been named.[2]
References
<templatestyles src="Reflist/styles.css" />
- ↑ Script error: No such module "citation/CS1".
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "citation/CS1".
<ref> tag with name "Veres-2015" defined in <references> is not used in prior text.Script error: No such module "Check for unknown parameters".
External links
- Asteroid Lightcurve Database (LCDB), query form (info Template:Webarchive)
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Template:NeoDys
- Template:ESA-SSA
- Template:PAGENAMEBASE at the JPL Small-Body DatabaseTemplate:EditAtWikidata
Script error: No such module "Navbox". Script error: No such module "Navbox". Template:Authority control