Discovery [1] | |
---|---|
Discovered by | K. Reinmuth |
Discovery site | Heidelberg Obs. |
Discovery date | 3 August 1940 |
Designations | |
(1881) Shao | |
Named after |
Cheng-yuan Shao
[1] (Chinese astronomer) |
1940 PC · 1968 OO | |
main-belt
[1]
[2] · (
outer) background [3] | |
Orbital characteristics [2] | |
Epoch 23 March 2018 ( JD 2458200.5) | |
Uncertainty parameter 0 | |
Observation arc | 77.71 yr (28,385 d) |
Aphelion | 3.5061 AU |
Perihelion | 2.8339 AU |
3.1700 AU | |
Eccentricity | 0.1060 |
5.64 yr (2,062 d) | |
314.29 ° | |
0° 10m 28.56s / day | |
Inclination | 9.8706° |
218.07° | |
66.640° | |
Physical characteristics | |
24.083±0.134
km
[4] 25.437±0.176 km [5] 25.46±0.86 km [6] 29.21 km (calculated) [7] | |
5.61±0.07
h
[8] 7.452±0.002 h [9] | |
0.057 (assumed)
[7] 0.0994±0.0087 [5] 0.111±0.010 [4] 0.115±0.009 [6] | |
C (assumed) [7] | |
11.10
[5]
[6] 11.19±0.04 (R) [8] 11.4 [2] [7] 11.65±0.25 [10] | |
1881 Shao, provisional designation 1940 PC or 1968 OO, is a background asteroid from the outer regions of the asteroid belt, approximately 25 kilometers (16 miles) in diameter. It was discovered on 3 August 1940, by German astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany. [1] The presumed C-type asteroid has a rotation period of 7.45 hours. [7] It was named for Chinese astronomer Cheng-yuan Shao. [1]
Shao is a non- family asteroid from the main belt's background population. [3] It orbits the Sun in the outer main-belt at a distance of 2.8–3.5 AU once every 5 years and 8 months (2,062 days; semi-major axis of 3.17 AU). Its orbit has an eccentricity of 0.11 and an inclination of 10 ° with respect to the ecliptic. [2] The body's observation arc begins with its official discovery observation at Heidelberg in 1940. [1]
Shao is an assumed carbonaceous C-type asteroid. [7]
In July 2013, a rotational lightcurve of Shao was obtained from photometric observations by Italian amateur astronomer Silvano Casulli. Lightcurve analysis gave a rotation period of 7.452 hours with a brightness variation of 0.15 magnitude ( U=2). [9] A second lightcurve by astronomers at the Palomar Transient Factory from December 2014, gave a shorter period of 5.61 hours and an amplitude of 0.11 ( U=2), indicative for a rather spherical shape. [7] [8]
According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Shao measures between 24.083 and 25.46 kilometers in diameter and its surface has an albedo between 0.0994 and 0.115. [4] [5] [6] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057, and calculates a diameter of 29.21 kilometers based on an absolute magnitude of 11.4. [7]
This minor planet was named after Chinese astronomer Cheng-yuan Shao (born 1927), an assistant to Richard McCrosky (see previously numbered 1880 McCrosky) in Harvard's minor-planet program at the Harvard–Smithsonian Center for Astrophysics and Oak Ridge Observatory in Massachusetts, United States. Shao was also involved in the recovery of near-Earth asteroid 1862 Apollo. [1] The official naming citation was published by the Minor Planet Center on 20 February 1976 ( M.P.C. 3936). [11]
Discovery [1] | |
---|---|
Discovered by | K. Reinmuth |
Discovery site | Heidelberg Obs. |
Discovery date | 3 August 1940 |
Designations | |
(1881) Shao | |
Named after |
Cheng-yuan Shao
[1] (Chinese astronomer) |
1940 PC · 1968 OO | |
main-belt
[1]
[2] · (
outer) background [3] | |
Orbital characteristics [2] | |
Epoch 23 March 2018 ( JD 2458200.5) | |
Uncertainty parameter 0 | |
Observation arc | 77.71 yr (28,385 d) |
Aphelion | 3.5061 AU |
Perihelion | 2.8339 AU |
3.1700 AU | |
Eccentricity | 0.1060 |
5.64 yr (2,062 d) | |
314.29 ° | |
0° 10m 28.56s / day | |
Inclination | 9.8706° |
218.07° | |
66.640° | |
Physical characteristics | |
24.083±0.134
km
[4] 25.437±0.176 km [5] 25.46±0.86 km [6] 29.21 km (calculated) [7] | |
5.61±0.07
h
[8] 7.452±0.002 h [9] | |
0.057 (assumed)
[7] 0.0994±0.0087 [5] 0.111±0.010 [4] 0.115±0.009 [6] | |
C (assumed) [7] | |
11.10
[5]
[6] 11.19±0.04 (R) [8] 11.4 [2] [7] 11.65±0.25 [10] | |
1881 Shao, provisional designation 1940 PC or 1968 OO, is a background asteroid from the outer regions of the asteroid belt, approximately 25 kilometers (16 miles) in diameter. It was discovered on 3 August 1940, by German astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany. [1] The presumed C-type asteroid has a rotation period of 7.45 hours. [7] It was named for Chinese astronomer Cheng-yuan Shao. [1]
Shao is a non- family asteroid from the main belt's background population. [3] It orbits the Sun in the outer main-belt at a distance of 2.8–3.5 AU once every 5 years and 8 months (2,062 days; semi-major axis of 3.17 AU). Its orbit has an eccentricity of 0.11 and an inclination of 10 ° with respect to the ecliptic. [2] The body's observation arc begins with its official discovery observation at Heidelberg in 1940. [1]
Shao is an assumed carbonaceous C-type asteroid. [7]
In July 2013, a rotational lightcurve of Shao was obtained from photometric observations by Italian amateur astronomer Silvano Casulli. Lightcurve analysis gave a rotation period of 7.452 hours with a brightness variation of 0.15 magnitude ( U=2). [9] A second lightcurve by astronomers at the Palomar Transient Factory from December 2014, gave a shorter period of 5.61 hours and an amplitude of 0.11 ( U=2), indicative for a rather spherical shape. [7] [8]
According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Shao measures between 24.083 and 25.46 kilometers in diameter and its surface has an albedo between 0.0994 and 0.115. [4] [5] [6] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057, and calculates a diameter of 29.21 kilometers based on an absolute magnitude of 11.4. [7]
This minor planet was named after Chinese astronomer Cheng-yuan Shao (born 1927), an assistant to Richard McCrosky (see previously numbered 1880 McCrosky) in Harvard's minor-planet program at the Harvard–Smithsonian Center for Astrophysics and Oak Ridge Observatory in Massachusetts, United States. Shao was also involved in the recovery of near-Earth asteroid 1862 Apollo. [1] The official naming citation was published by the Minor Planet Center on 20 February 1976 ( M.P.C. 3936). [11]