1384 Kniertje

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1384 Kniertje
Discovery [1]
Discovered by H. van Gent
Discovery site Johannesburg Obs.
Discovery date9 September 1934
Designations
(1384) Kniertje
Named after
Kniertje [2] (fictional character)
1934 RX
main-belt  ·(middle)
Eunomia [3]  · Adeona [4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 83.06 yr (30,338 days)
Aphelion 3.1649 AU
Perihelion 2.1872 AU
2.6760 AU
Eccentricity 0.1827
4.38 yr (1,599 days)
288.15°
0° 13m 30.36s / day
Inclination 11.858°
152.86°
276.17°
Physical characteristics
Dimensions 21.52±6.01 km [5]
21.72±6.93 km [6]
26.14±0.56 km [7]
26.29±0.38 km [8]
26.517±0.090 km [9]
26.59 km (derived) [3]
27.51±1.6 km [10]
29.592±0.230 km [11]
9.78±0.02 h [12]
9.807±0.002 h [12]
9.808±0.001 h [12]
9.824±0.001 h [13]
9.872±0.012 h [14]
12.255±0.004 h [15] [a]
0.0351±0.0035 [11]
0.06±0.03 [6]
0.064±0.006 [8]
0.066±0.003 [7]
0.07±0.05 [5]
0.0701 (derived) [3]
0.3077±0.039 [10]
S (assumed, Eunomia) [3]
C (assumed; Adeona) [16] : 23 
9.70 [10]  ·11.38 [3] [11]  ·11.4 [17]  ·11.50 [7] [8]  ·11.60 [1] [6]  ·11.64 [5]  ·11.81±0.22 [18]

    1384 Kniertje, provisional designation 1934 RX, 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. [19] The asteroid was named after a character in the Dutch play Op Hoop van Zegen by Herman Heijermans. [2]

    Contents

    Orbit and classification

    Kniertje is a member of the Adeona family ( 505 ), [4] 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. [3] [16] : 23 

    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. [1] The body's observation arc begins with its official discovery observation at Johannesburg in 1934. [19]

    Physical characteristics

    Kniertje's 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 ). [3] [16] : 23 

    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 ( U=2/2/2/2/2 ). [12] [13] [14] An alternative period solution of 12.255 hours with an amplitude of 0.33 magnitude was found by Brian Warner in March 2006 ( U=2 ). [15] [a]

    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. [5] [6] [7] [8] [9] [10] [11]

    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. [3]

    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 ). [2]

    Notes

    1. 1 2 Lightcurve plot of 1384 Kniertje, Palmer Divide Observatory, Brian D. Warner (2006). Observer's comment: "a period of 9.816 h cannot be formally excluded". Summary figures at LCDB.

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    References

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