Discovery [1] | |
---|---|
Discovered by | S. Belyavskyj |
Discovery site | Simeiz Obs. |
Discovery date | 5 November 1921 |
Designations | |
(969) Leocadia | |
Pronunciation | /liːoʊˈkeɪdiə/ [2] |
Named after | unknown [3] |
A921 VC · 1940 RV 1944 SB · 1948 UG 1963 PA · 1921 KZ | |
main-belt
[1]
[4] · (
inner) background [5] [6] | |
Orbital characteristics [4] | |
Epoch 31 May 2020 ( JD 2459000.5) | |
Uncertainty parameter 0 | |
Observation arc | 98.12 yr (35,837 d) |
Aphelion | 2.9694 AU |
Perihelion | 1.9537 AU |
2.4615 AU | |
Eccentricity | 0.2063 |
3.86 yr (1,411 d) | |
199.53 ° | |
0° 15m 18.72s / day | |
Inclination | 2.2928° |
287.76° | |
91.332° | |
Physical characteristics | |
6.87±0.01 h [10] [11] | |
12.8 [1] [4] | |
969 Leocadia ( prov. designation: A921 VC or 1921 KZ) is a very dark background asteroid from the inner regions of the asteroid belt, approximately 19 kilometers (12 miles) in diameter. It was discovered on 5 November 1921, by Russian astronomer Sergey Belyavsky at the Simeiz Observatory on the Crimean peninsula. [1] The uncommon F-type asteroid (FX) has a rotation period of 6.9 hours and is likely regular in shape. [10] Any reference of the asteroid's name to a person is unknown. [3]
Leocadia is a non- family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements. [5] [6] It orbits the Sun in the inner main-belt at a distance of 2.0–3.0 AU once every 3 years and 10 months (1,411 days; semi-major axis of 2.46 AU). Its orbit has an eccentricity of 0.21 and an inclination of 2 ° with respect to the ecliptic. [4] The body's observation arc begins at Uccle Observatory in February 1933, more than a decade after its official discovery observation Simeiz Observatory on 5 November 1921. [1]
This minor planet is named after a Feminine Russian first name. Any reference of this name to a person or occurrence is unknown. [3]
Among the many thousands of named minor planets, Leocadia is one of 120 asteroids, for which no official naming citation has been published. All of these low-numbered asteroids have numbers between 164 Eva and 1514 Ricouxa and were discovered between 1876 and the 1930s, predominantly by astronomers Auguste Charlois, Johann Palisa, Max Wolf and Karl Reinmuth. [12]
In the Tholen classification (FXU:), Leocadia is an uncommon and dark F-type asteroid, somewhat similar to that of an X-type, though with an unusual (U) and noisy (:) spectra. [4]
In December 2006, a rotational lightcurve of Leocadia was obtained from photometric observations by Italian amateur astronomers Roberto Crippa and Federico Manzini at the Sozzago Astronomical Station ( A12). Lightcurve analysis gave a rotation period of 6.87±0.01 hours with a brightness amplitude of 0.14±0.01 magnitude ( U=2), which is indicative of a rather spherical, non-irregular shape. [10] [11]
According to the surveys carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), the Japanese Akari satellite, and the Infrared Astronomical Satellite IRAS, Leocadia measures 17.321±0.218, 19.37±0.22 and 19.51±0.7 kilometers in diameter, and its surface has a very low albedo of 0.019±0.005, 0.0435±0.003 and 0.045±0.001, respectively. [7] [8] [9] Additional measurements by the WISE telescope were published giving a mean diameter as low as 13.58±3.09 km. [11] The Collaborative Asteroid Lightcurve Link adopts the result from IRAS, that is, an albedo of 0.0435 and a diameter of 19.51 kilometers based on an absolute magnitude of 9.22. [11]
An asteroid occultation on 19 August 2013, gave a best-fit ellipse dimension of 19.0 × 19.0 kilometers. [6] These timed observations are taken when the asteroid passes in front of a distant star. However the measurements for Leocadia were of poor quality. [6]
Discovery [1] | |
---|---|
Discovered by | S. Belyavskyj |
Discovery site | Simeiz Obs. |
Discovery date | 5 November 1921 |
Designations | |
(969) Leocadia | |
Pronunciation | /liːoʊˈkeɪdiə/ [2] |
Named after | unknown [3] |
A921 VC · 1940 RV 1944 SB · 1948 UG 1963 PA · 1921 KZ | |
main-belt
[1]
[4] · (
inner) background [5] [6] | |
Orbital characteristics [4] | |
Epoch 31 May 2020 ( JD 2459000.5) | |
Uncertainty parameter 0 | |
Observation arc | 98.12 yr (35,837 d) |
Aphelion | 2.9694 AU |
Perihelion | 1.9537 AU |
2.4615 AU | |
Eccentricity | 0.2063 |
3.86 yr (1,411 d) | |
199.53 ° | |
0° 15m 18.72s / day | |
Inclination | 2.2928° |
287.76° | |
91.332° | |
Physical characteristics | |
6.87±0.01 h [10] [11] | |
12.8 [1] [4] | |
969 Leocadia ( prov. designation: A921 VC or 1921 KZ) is a very dark background asteroid from the inner regions of the asteroid belt, approximately 19 kilometers (12 miles) in diameter. It was discovered on 5 November 1921, by Russian astronomer Sergey Belyavsky at the Simeiz Observatory on the Crimean peninsula. [1] The uncommon F-type asteroid (FX) has a rotation period of 6.9 hours and is likely regular in shape. [10] Any reference of the asteroid's name to a person is unknown. [3]
Leocadia is a non- family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements. [5] [6] It orbits the Sun in the inner main-belt at a distance of 2.0–3.0 AU once every 3 years and 10 months (1,411 days; semi-major axis of 2.46 AU). Its orbit has an eccentricity of 0.21 and an inclination of 2 ° with respect to the ecliptic. [4] The body's observation arc begins at Uccle Observatory in February 1933, more than a decade after its official discovery observation Simeiz Observatory on 5 November 1921. [1]
This minor planet is named after a Feminine Russian first name. Any reference of this name to a person or occurrence is unknown. [3]
Among the many thousands of named minor planets, Leocadia is one of 120 asteroids, for which no official naming citation has been published. All of these low-numbered asteroids have numbers between 164 Eva and 1514 Ricouxa and were discovered between 1876 and the 1930s, predominantly by astronomers Auguste Charlois, Johann Palisa, Max Wolf and Karl Reinmuth. [12]
In the Tholen classification (FXU:), Leocadia is an uncommon and dark F-type asteroid, somewhat similar to that of an X-type, though with an unusual (U) and noisy (:) spectra. [4]
In December 2006, a rotational lightcurve of Leocadia was obtained from photometric observations by Italian amateur astronomers Roberto Crippa and Federico Manzini at the Sozzago Astronomical Station ( A12). Lightcurve analysis gave a rotation period of 6.87±0.01 hours with a brightness amplitude of 0.14±0.01 magnitude ( U=2), which is indicative of a rather spherical, non-irregular shape. [10] [11]
According to the surveys carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), the Japanese Akari satellite, and the Infrared Astronomical Satellite IRAS, Leocadia measures 17.321±0.218, 19.37±0.22 and 19.51±0.7 kilometers in diameter, and its surface has a very low albedo of 0.019±0.005, 0.0435±0.003 and 0.045±0.001, respectively. [7] [8] [9] Additional measurements by the WISE telescope were published giving a mean diameter as low as 13.58±3.09 km. [11] The Collaborative Asteroid Lightcurve Link adopts the result from IRAS, that is, an albedo of 0.0435 and a diameter of 19.51 kilometers based on an absolute magnitude of 9.22. [11]
An asteroid occultation on 19 August 2013, gave a best-fit ellipse dimension of 19.0 × 19.0 kilometers. [6] These timed observations are taken when the asteroid passes in front of a distant star. However the measurements for Leocadia were of poor quality. [6]