Discovery [1] | |
---|---|
Discovered by | K. Reinmuth |
Discovery site | Heidelberg Obs. |
Discovery date | 7 March 1924 |
Designations | |
(1020) Arcadia | |
Pronunciation | /ɑːrˈkeɪdiə/ [2] |
Named after | Arcadia (Greek region) [3] |
1924 QV · 1954 UA2 1975 EQ · 1977 QO2 | |
main-belt
[1]
[4] · (
middle) Agnia [5] [6] | |
Orbital characteristics [4] | |
Epoch 23 March 2018 ( JD 2458200.5) | |
Uncertainty parameter 0 | |
Observation arc | 93.89 yr (34,293 d) |
Aphelion | 2.9152 AU |
Perihelion | 2.6666 AU |
2.7909 AU | |
Eccentricity | 0.0445 |
4.66 yr (1,703 d) | |
18.189 ° | |
0° 12m 41.04s / day | |
Inclination | 4.0598° |
180.71° | |
37.691° | |
Physical characteristics | |
Mean diameter | 10.067±0.090
km
[7] 10.415±0.123 km [8] 13.02±0.49 km [9] 21.16 km (calculated) [10] |
17.02±0.02 h [11] | |
0.057 (assumed)
[10] 0.150±0.023 [9] 0.2364±0.0456 [8] | |
SMASS =
S
[4] ·
S
[12] S(SDSS-MFB) [10] | |
12.0
[4] · 12.10
[8]
[9]
[10] 12.29±0.11 [12] | |
1020 Arcadia, provisional designation 1924 QV, is a stony Agnia asteroid from the central regions of the asteroid belt, approximately 11 kilometers (7 miles) in diameter. It was discovered on 7 March 1924, by German astronomer Karl Reinmuth at the Heidelberg Observatory in Heidelberg, Germany. [1] The asteroid was named after the Greek region of Arcadia. [3]
Arcadia is a member of the Agnia family ( 514), [5] [6] a very large family of stony asteroids with more than 2000 known members. [13] They most likely formed from the breakup of a basalt object, which in turn was spawned from a larger parent body that underwent igneous differentiation. [6] The family's parent body and namesake is the asteroid 847 Agnia. [13]
It orbits the Sun in the central main-belt at a distance of 2.7–2.9 AU once every 4 years and 8 months (1,703 days; semi-major axis of 2.79 AU). Its orbit has an eccentricity of 0.04 and an inclination of 4 ° with respect to the ecliptic. [4] The body's observation arc begins at Heidelberg in March 1924, six days after its official discovery observation. [1]
In the SMASS classification, Arcadia is a common, stony S-type asteroid. [4] It has been characterized as an S-type by Pan-STARRS photometric survey, [12] as well as by SDSS-MFB (Masi Foglia Bus). [10]
In November 2011, a fragmentary rotational lightcurve of Arcadia was obtained from photometric observations by Gordon Gartrelle at the University of North Dakota. Lightcurve analysis gave a rotation period of 17.02 hours with a brightness amplitude of 0.05 magnitude ( U=1). [11] As of 2018, no secure period has been obtained. [10]
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Arcadia measures between 10.067 and 13.02 kilometers in diameter and its surface has an albedo between 0.150 and 0.2364. [7] [8] [9] The Collaborative Asteroid Lightcurve Link assumes an albedo 0.057, i.e. an albedo for a carbonaceous rather than for a stony asteroid, and consequently calculates a much larger diameter of 21.16 kilometers based on an absolute magnitude of 12.1. [10] It may be speculated whether this anomaly is a glitch in the data base.
This minor planet was named after the Greek region of Arcadia in central Peloponnese. It is also a celebrated mythological region, where the shepherd god Pan lived. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 ( H 97). [3]
Discovery [1] | |
---|---|
Discovered by | K. Reinmuth |
Discovery site | Heidelberg Obs. |
Discovery date | 7 March 1924 |
Designations | |
(1020) Arcadia | |
Pronunciation | /ɑːrˈkeɪdiə/ [2] |
Named after | Arcadia (Greek region) [3] |
1924 QV · 1954 UA2 1975 EQ · 1977 QO2 | |
main-belt
[1]
[4] · (
middle) Agnia [5] [6] | |
Orbital characteristics [4] | |
Epoch 23 March 2018 ( JD 2458200.5) | |
Uncertainty parameter 0 | |
Observation arc | 93.89 yr (34,293 d) |
Aphelion | 2.9152 AU |
Perihelion | 2.6666 AU |
2.7909 AU | |
Eccentricity | 0.0445 |
4.66 yr (1,703 d) | |
18.189 ° | |
0° 12m 41.04s / day | |
Inclination | 4.0598° |
180.71° | |
37.691° | |
Physical characteristics | |
Mean diameter | 10.067±0.090
km
[7] 10.415±0.123 km [8] 13.02±0.49 km [9] 21.16 km (calculated) [10] |
17.02±0.02 h [11] | |
0.057 (assumed)
[10] 0.150±0.023 [9] 0.2364±0.0456 [8] | |
SMASS =
S
[4] ·
S
[12] S(SDSS-MFB) [10] | |
12.0
[4] · 12.10
[8]
[9]
[10] 12.29±0.11 [12] | |
1020 Arcadia, provisional designation 1924 QV, is a stony Agnia asteroid from the central regions of the asteroid belt, approximately 11 kilometers (7 miles) in diameter. It was discovered on 7 March 1924, by German astronomer Karl Reinmuth at the Heidelberg Observatory in Heidelberg, Germany. [1] The asteroid was named after the Greek region of Arcadia. [3]
Arcadia is a member of the Agnia family ( 514), [5] [6] a very large family of stony asteroids with more than 2000 known members. [13] They most likely formed from the breakup of a basalt object, which in turn was spawned from a larger parent body that underwent igneous differentiation. [6] The family's parent body and namesake is the asteroid 847 Agnia. [13]
It orbits the Sun in the central main-belt at a distance of 2.7–2.9 AU once every 4 years and 8 months (1,703 days; semi-major axis of 2.79 AU). Its orbit has an eccentricity of 0.04 and an inclination of 4 ° with respect to the ecliptic. [4] The body's observation arc begins at Heidelberg in March 1924, six days after its official discovery observation. [1]
In the SMASS classification, Arcadia is a common, stony S-type asteroid. [4] It has been characterized as an S-type by Pan-STARRS photometric survey, [12] as well as by SDSS-MFB (Masi Foglia Bus). [10]
In November 2011, a fragmentary rotational lightcurve of Arcadia was obtained from photometric observations by Gordon Gartrelle at the University of North Dakota. Lightcurve analysis gave a rotation period of 17.02 hours with a brightness amplitude of 0.05 magnitude ( U=1). [11] As of 2018, no secure period has been obtained. [10]
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Arcadia measures between 10.067 and 13.02 kilometers in diameter and its surface has an albedo between 0.150 and 0.2364. [7] [8] [9] The Collaborative Asteroid Lightcurve Link assumes an albedo 0.057, i.e. an albedo for a carbonaceous rather than for a stony asteroid, and consequently calculates a much larger diameter of 21.16 kilometers based on an absolute magnitude of 12.1. [10] It may be speculated whether this anomaly is a glitch in the data base.
This minor planet was named after the Greek region of Arcadia in central Peloponnese. It is also a celebrated mythological region, where the shepherd god Pan lived. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 ( H 97). [3]