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(9948) 1990 QB2

Stony Nysian asteroid

Field	Value
minorplanet	yes
name	(9948)
background	#D6D6D6
image	AnimatedOrbitOf99481990QB2.gif
caption	Orbit of (blue), the inner planets
and Jupiter (outermost)
discovery_ref
discoverer	H. E. Holt
discovery_site	Palomar Obs.
discovered	22 August 1990
mpc_name	(9948)
alt_names

named_after
mp_category	main-belt(inner)
Nysa
orbit_ref
epoch	23 March 2018 (JD 2458200.5)
uncertainty	0
observation_arc	38.43 yr (14,035 d)
aphelion	2.9012 AU
perihelion	1.8657 AU
semimajor	2.3835 AU
eccentricity	0.2172
period	3.68 yr (1,344 d)
mean_anomaly	187.50°
mean_motion	/ day
inclination	2.0964°
asc_node	171.55°
arg_peri	151.67°
mean_diameter

rotation	(R)
(R)
albedo

spectral_type	S (SDSS-MOC)
S (Pan-STARRS)
abs_magnitude
(R)
14.3
(R)
14.5
14.62

and Jupiter (outermost)

Nysa

(R)

S (Pan-STARRS) (R) 14.3 (R) 14.5 14.62

**** (provisional designation ****) is a stony Nysian asteroid from the inner region of the asteroid belt, approximately 3.4 km in diameter. It was discovered on 22 August 1990, by American astronomer Henry Holt at the Palomar Observatory in California. The likely elongated S-type asteroid has a rotation period of 3.53 hours. This asteroid has not been named.

Orbit and classification

is member of the Nysa family (405), located in the Nysa–Polana complex. It is named after 44 Nysa and one of the largest families in the main belt.

The asteroid orbits the Sun in the inner asteroid belt at a distance of 1.9–2.9 AU once every 3 years and 8 months (1,344 days; semi-major axis of 2.38 AU). Its orbit has an eccentricity of 0.22 and an inclination of 2° with respect to the ecliptic. The asteroid was first observed as at Crimea–Nauchnij in September 1979. The body's observation arc begins at Palomar with its official discovery observation in 1990.

Physical characteristics

has been characterized as a common, stony S-type asteroid by Pan-STARRS survey and in the SDSS-based taxonomy.

Rotation period

In November 2005, a first rotational lightcurve of was obtained from photometric observations by Australian amateur astronomer David Higgins. Lightcurve analysis gave a well-defined rotation period of 3.5257 hours with a high brightness variation of 0.77 magnitude (). In January 2014, observations in the R-band at the Palomar Transient Factory in California gave two concurring periods of 3.523 and 3.53 hours with an amplitude of 0.60 magnitude (). A high brightness amplitude typically indicates that the body has a non-spherical shape

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, measures 3.345 kilometers in diameter and its surface has an albedo of 0.250. The Collaborative Asteroid Lightcurve Link adopts Petr Pravec's revised WISE-result, that is, an albedo of 0.2232 and a diameter of 3.351 kilometers based on an absolute magnitude of 14.62.

Naming

This minor planet was numbered on 2 February 1999 (M.P.C. 33659). As of 2018, it has not been named.

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.

nysa-asteroids discoveries-by-henry-e.-holt s-type-asteroids astronomical-objects-discovered-in-1990

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