Discovery [1] | |
---|---|
Discovered by | H. van Gent |
Discovery site | Johannesburg Obs. |
Discovery date | 9 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]
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]
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
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]
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]
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]
Discovery [1] | |
---|---|
Discovered by | H. van Gent |
Discovery site | Johannesburg Obs. |
Discovery date | 9 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]
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]
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
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]
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]
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]