Discovery [1] | |
---|---|
Discovered by | Karl Wilhelm Reinmuth |
Discovery site | Heidelberg Obs. |
Discovery date | 23 March 1942 |
Designations | |
(5535) Annefrank | |
Named after |
Anne Frank (Holocaust victim) [2] |
1942 EM · 1978 EK6 1986 TV14 · 1991 BO2 | |
main-belt · Flora [3] | |
Orbital characteristics [1] | |
Epoch 4 September 2017 ( JD 2458000.5) | |
Uncertainty parameter 0 | |
Observation arc | 75.02 yr (27,400 days) |
Aphelion | 2.3527 AU |
Perihelion | 2.0721 AU |
2.2124 AU | |
Eccentricity | 0.0634 |
3.29 yr (1,202 days) | |
23.021 ° | |
0° 17m 58.2s / day | |
Inclination | 4.2473° |
120.64° | |
9.1351° | |
Physical characteristics | |
Dimensions | (6.6 x 5.0 x 3.4 km)
[1] 4.34±0.23 km [4] 4.8 km [1] 4.94 km (calculated) [3] |
15.12
h
[5] 15.156±0.0474 h [6] 21.33±0.990 h [7] | |
0.21±0.03
[8] 0.24 (assumed) [3] 0.279±0.092 [9] 0.311±0.056 [4] | |
S [3] [8] | |
13.650±0.120 (R) [7] · 13.679±0.001 (R) [6] · 13.7 [1] [3] [4] · 13.88±0.32 [10] | |
5535 Annefrank ( /ˌænˈfræŋk/), provisional designation 1942 EM, is a stony Florian asteroid and suspected contact binary from the inner asteroid belt, approximately 4.5 kilometers in diameter. It was used as a target to practice the flyby technique that the Stardust space probe would later use on the comet Wild 2. [8]
The asteroid was discovered 23 March 1942, by German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany. [11] It was named after Anne Frank, a victim of the Holocaust. [2]
Annefrank is a member of the Flora family, one of the largest collisional populations of stony asteroids in the main-belt. It orbits the Sun in the inner main-belt at a distance of 2.1–2.4 AU once every 3 years and 3 months (1,202 days). Its orbit has an eccentricity of 0.06 and an inclination of 4 ° with respect to the ecliptic. [1]
The body's observation arc begins at Crimea–Nauchnij in 1978, with its identification as 1978 EK6, 36 years after its official discovery observation at Heidelberg. [11]
Annefrank has been characterized as a common S-type asteroid. [3] [8]
On 2 November 2002, the Stardust space probe flew past Annefrank at a distance of 3079 km. Its images show the asteroid to be 6.6 × 5.0 × 3.4 km, twice as big as previously thought, and its main body shaped like a triangular prism with several visible impact craters. [8] From the photographs, the albedo of Annefrank was computed to be between 0.18 and 0.24. [8] Preliminary analysis of the Stardust imagery suggests that Annefrank may be a contact binary, although other possible explanations exist for its observed shape. [8]
In October 2006, ground-based photometric observations were used in an attempt to measure Annefrank's rotational period. Analysis of the ambiguous lightcurve gave a period of 15.12 hours and a brightness variation of 0.25 magnitude with two alternative period solutions of 12 and 22.8 hours, respectively ( U=2). [3] [5]
In January 2014, photometric observations at the Palomar Transient Factory gave a rotation period of 15.156 and 21.33 hours with an amplitude of 0.17 and 0.20 magnitude, respectively ( U=2/2). [6] [7]
The lightcurve data suggests that Annefrank is not Lambertian, meaning that surface features, such as shadows from boulders and craters, play a role in the object's perceived brightness and not just the asteroid's relative size when seen from that orientation. [5]
The body's shortest axis is approximately aligned perpendicular to its orbital plane. [8]
This minor planet was named after Anne Frank, the German-Dutch-Jewish diarist who died in a Nazi concentration camp during the Second World War. [2] The official naming citation was published by the Minor Planet Center on 14 May 1995 ( M.P.C. 25230). [12]
Discovery [1] | |
---|---|
Discovered by | Karl Wilhelm Reinmuth |
Discovery site | Heidelberg Obs. |
Discovery date | 23 March 1942 |
Designations | |
(5535) Annefrank | |
Named after |
Anne Frank (Holocaust victim) [2] |
1942 EM · 1978 EK6 1986 TV14 · 1991 BO2 | |
main-belt · Flora [3] | |
Orbital characteristics [1] | |
Epoch 4 September 2017 ( JD 2458000.5) | |
Uncertainty parameter 0 | |
Observation arc | 75.02 yr (27,400 days) |
Aphelion | 2.3527 AU |
Perihelion | 2.0721 AU |
2.2124 AU | |
Eccentricity | 0.0634 |
3.29 yr (1,202 days) | |
23.021 ° | |
0° 17m 58.2s / day | |
Inclination | 4.2473° |
120.64° | |
9.1351° | |
Physical characteristics | |
Dimensions | (6.6 x 5.0 x 3.4 km)
[1] 4.34±0.23 km [4] 4.8 km [1] 4.94 km (calculated) [3] |
15.12
h
[5] 15.156±0.0474 h [6] 21.33±0.990 h [7] | |
0.21±0.03
[8] 0.24 (assumed) [3] 0.279±0.092 [9] 0.311±0.056 [4] | |
S [3] [8] | |
13.650±0.120 (R) [7] · 13.679±0.001 (R) [6] · 13.7 [1] [3] [4] · 13.88±0.32 [10] | |
5535 Annefrank ( /ˌænˈfræŋk/), provisional designation 1942 EM, is a stony Florian asteroid and suspected contact binary from the inner asteroid belt, approximately 4.5 kilometers in diameter. It was used as a target to practice the flyby technique that the Stardust space probe would later use on the comet Wild 2. [8]
The asteroid was discovered 23 March 1942, by German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany. [11] It was named after Anne Frank, a victim of the Holocaust. [2]
Annefrank is a member of the Flora family, one of the largest collisional populations of stony asteroids in the main-belt. It orbits the Sun in the inner main-belt at a distance of 2.1–2.4 AU once every 3 years and 3 months (1,202 days). Its orbit has an eccentricity of 0.06 and an inclination of 4 ° with respect to the ecliptic. [1]
The body's observation arc begins at Crimea–Nauchnij in 1978, with its identification as 1978 EK6, 36 years after its official discovery observation at Heidelberg. [11]
Annefrank has been characterized as a common S-type asteroid. [3] [8]
On 2 November 2002, the Stardust space probe flew past Annefrank at a distance of 3079 km. Its images show the asteroid to be 6.6 × 5.0 × 3.4 km, twice as big as previously thought, and its main body shaped like a triangular prism with several visible impact craters. [8] From the photographs, the albedo of Annefrank was computed to be between 0.18 and 0.24. [8] Preliminary analysis of the Stardust imagery suggests that Annefrank may be a contact binary, although other possible explanations exist for its observed shape. [8]
In October 2006, ground-based photometric observations were used in an attempt to measure Annefrank's rotational period. Analysis of the ambiguous lightcurve gave a period of 15.12 hours and a brightness variation of 0.25 magnitude with two alternative period solutions of 12 and 22.8 hours, respectively ( U=2). [3] [5]
In January 2014, photometric observations at the Palomar Transient Factory gave a rotation period of 15.156 and 21.33 hours with an amplitude of 0.17 and 0.20 magnitude, respectively ( U=2/2). [6] [7]
The lightcurve data suggests that Annefrank is not Lambertian, meaning that surface features, such as shadows from boulders and craters, play a role in the object's perceived brightness and not just the asteroid's relative size when seen from that orientation. [5]
The body's shortest axis is approximately aligned perpendicular to its orbital plane. [8]
This minor planet was named after Anne Frank, the German-Dutch-Jewish diarist who died in a Nazi concentration camp during the Second World War. [2] The official naming citation was published by the Minor Planet Center on 14 May 1995 ( M.P.C. 25230). [12]