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1384 Kniertje

Dark Adeonian asteroid

Field	Value
minorplanet	yes
name	1384 Kniertje
background	#D6D6D6
discovery_ref
discoverer	H. van Gent
discovery_site	Johannesburg Obs.
discovered	9 September 1934
mpc_name	(1384) Kniertje
alt_names	1934 RX
named_after	Kniertje (fictional character)
mp_category	main-belt(middle)
EunomiaAdeona
orbit_ref
epoch	4 September 2017 (JD 2458000.5)
uncertainty	0
observation_arc	83.06 yr (30,338 days)
aphelion	3.1649 AU
perihelion	2.1872 AU
semimajor	2.6760 AU
eccentricity	0.1827
period	4.38 yr (1,599 days)
mean_anomaly	288.15°
mean_motion	/ day
inclination	11.858°
asc_node	152.86°
arg_peri	276.17°
dimensions	km
km
km
km
km
26.59 km (derived)
km
km
rotation	h
h
h
h
h
h
albedo
0.0701 (derived)

spectral_type	S (assumed, Eunomia)
C (assumed; Adeona)
abs_magnitude	9.7011.3811.411.5011.6011.64

EunomiaAdeona km km km km 26.59 km (derived) km km h h h h h

0.0701 (derived)

C (assumed; Adeona)

1384 Kniertje, provisional designation , is a dark Adeonian asteroid from the central regions of the asteroid belt, approximately 26 kilometers in diameter. It was discovered on 9 September 1934, by Dutch astronomer Hendrik van Gent at the Union Observatory in Johannesburg, South Africa. The asteroid was named after a character in the Dutch play Op Hoop van Zegen by Herman Heijermans.

Orbit and classification

Kniertje is a member of the Adeona family (505), a large family of carbonaceous asteroids in the central main belt, named after 145 Adeona. It is also dynamically classified as a member of the Eunomia family (502), the largest in the intermediate main belt with more than 5,000 stony asteroids.

The asteroid orbits the Sun in the central asteroid belt at a distance of 2.2–3.2 AU once every 4 years and 5 months (1,599 days). Its orbit has an eccentricity of 0.18 and an inclination of 12° with respect to the ecliptic. The body's observation arc begins with its official discovery observation at Johannesburg in 1934.

Physical characteristics

Kniertjes spectral type is unknown. Although the LCDB assumes an S-type (due to its dynamical classification to the stony Eunomia family), a low albedo of 0.0701 is derived (see below) which is typical for carbonaceous C-type asteroids and in agreement with the overall spectral type of the Adeona family (505).

Rotation period

Several rotational lightcurves of Kniertje have been obtained from photometric observations since 2003. Lightcurve analysis gave a rotation period between 9.78 and 9.872 hours with a brightness variation between 0.15 and 0.32 magnitude (). An alternative period solution of 12.255 hours with an amplitude of 0.33 magnitude was found by Brian Warner in March 2006 ().

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Kniertje measures between 21.52 and 29.592 kilometers in diameter and its surface has an albedo between 0.0351 and 0.3077.

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0701 and a diameter of 26.59 kilometers based on an absolute magnitude of 11.38.

Naming

This minor planet was named after the principal character in Op Hoop van Zegen, a play by Dutch writer Herman Heijermans (1864–1924). The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 125).

Notes

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.

adeona-asteroids discoveries-by-hendrik-van-gent named-minor-planets astronomical-objects-discovered-in-1934

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