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(7025) 1993 QA

Sub-kilometer asteroid classified as near-Earth object

Field	Value
minorplanet	yes
name	(7025) 1993 QA
background	#FFC2E0
discovery_ref
discoverer	Spacewatch
discovery_site	Kitt Peak National Obs.
discovered	16 August 1993
mpc_name	(7025) 1993 QA
alt_names	1993 QA
named_after
mp_category	NEOApolloAmor
orbit_ref
epoch	4 September 2017 (JD 2458000.5)
uncertainty	0
observation_arc	22.88 yr (8,358 days)
aphelion	1.9405 AU
perihelion	1.0111 AU
semimajor	1.4758 AU
eccentricity	0.3149
period	1.79 yr (655 days)
mean_anomaly	25.431°
mean_motion	/ day
inclination	12.607°
asc_node	146.64°
arg_peri	323.39°
moid	0.0645 AU25.1 LD
dimensions	km
0.77 km (derived)
rotation	h
albedo	0.20 (assumed)

spectral_type	DS
abs_magnitude	17.9418.0018.3

0.77 km (derived)

(7025) 1993 QA is a sub-kilometer asteroid classified as near-Earth object of the Apollo and Amor group, respectively. It was discovered on 16 August 1993, by astronomers of the Spacewatch program at the Kitt Peak National Observatory near Tucson, Arizona, United States. The asteroid measures approximately half a kilometer in diameter and has a short rotation period of 2.5057 hours.

Orbit and classification

is a member of the dynamical Apollo group, which are Earth-crossing asteroids. Conversely, it is classified as a non-Earth crossing Amor asteroid by the Minor Planet Center, due to its near-threshold perihelion of 1.011 AU.

It orbits the Sun at a distance of 1.01–1.94 AU once every 21 months (655 days; semi-major axis of 1.48 AU). Its orbit has an eccentricity of 0.31 and an inclination of 13° with respect to the ecliptic. The body's observation arc begins with its official discovery observation by Spacewatch on 16 August 1993.

Close approaches

The asteroid has an Earth minimum orbital intersection distance of 0.0645 AU, which translates into 25.1 lunar distances. On 6 February 1996 it transited Earth at a nominal distance of 0.07080 AU. The body's next encounter with Earth below 0.1 AU will occur on 24 January 2025, at a distance of 0.06275 AU.

Physical characteristics

has been characterized as a dark D-type asteroid on images taken by the Sloan Digital Sky Survey. Conversely, Pan-STARRS photometric survey determined a much brighter S-type.

Rotation period

In the late 1990s, two rotational lightcurves of were obtained from photometric observations by European astronomers. Lightcurve analysis gave an identical, well-defined rotation period of 2.5057 hours with a brightness amplitude of 0.32 and 0.50 magnitude, respectively (). Its period is near the cohesionless spin-barrier of 2.2 hours, which set the upper limit for fast-rotating asteroids.

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, measures 498 meters in diameter and its surface has a high albedo of 0.340. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and derives a diameter of 770 meters based on an absolute magnitude of 17.94.

Naming

As of 2018, this minor planet has not been named yet.

References

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

apollo-asteroids amor-asteroids discoveries-by-the-spacewatch-project astronomical-objects-discovered-in-1993

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