| Discovery[1] | |
|---|---|
| Discovered by | M. Itzigsohn |
| Discovery site | La Plata Obs. |
| Discovery date | 15 June 1950 |
| Designations | |
| (1581) Abanderada | |
Named after | Eva Perón (First Lady of Argentina)[2] |
| 1950 LA1 · 1927 JD 1929 TY · 1943 EK 1949 FM1 · 1949 FQ 1949 FY · 1966 FP 1975 YH | |
| main-belt · (outer) Themis[3][4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 87.67 yr (32,023 days) |
| Aphelion | 3.5492AU |
| Perihelion | 2.7650 AU |
| 3.1571 AU | |
| Eccentricity | 0.1242 |
| 5.61yr (2,049 days) | |
| 40.223° | |
| 0° 10m 32.52s / day | |
| Inclination | 2.5388° |
| 104.82° | |
| 90.216° | |
| Physical characteristics | |
| Dimensions | 29.508±0.195 km[5] 29.722±0.184 km[6] 31.74±15.01 km[7] 36.49±0.64 km[8] 39.28 km(SIMPS)[3] |
| 19.2h(very poor) | |
| 0.0523(SIMPS)[3] 0.06±0.07[7] 0.061±0.002[8] 0.0916±0.0170[6] 0.093±0.005[5] | |
| Tholen = BCU[1][3] B–V = 0.659[1] U–B = 0.351[1] | |
| 10.85[1][3][6][8] · 11.00[7] | |
1581 Abanderada, provisional designation1950 LA1, is a dark Themistianasteroid from the outer regions of theasteroid belt, approximately 35 kilometers in diameter. It was discovered on 15 June 1950, by Argentine astronomerMiguel Itzigsohn at theLa Plata Astronomical Observatory in La Plata, Argentina.[9] The asteroid was named afterEva Perón.[2]
Abanderada is a Themistian asteroid that belongs to theThemis family (602),[3][4] a very largefamily of carbonaceous asteroids, named after24 Themis.[10]: 23 It orbits the Sun in theouter main-belt at a distance of 2.8–3.5 AU once every 5 years and 7 months (2,049 days). Its orbit has aneccentricity of 0.12 and aninclination of 3° with respect to theecliptic.[1]
The asteroid was first identified as1927 JD atSimeiz Observatory in May 1927. The body'sobservation arc begins with aprecovery image taken atLowell Observatory in September 1929, or almost 21 years prior to its official discovery observation at La Plata.[9]
In theTholen classification, the asteroid'sspectral type is ambiguous. It is closest to a bright carbonaceousB-type and somewhat similar to the commonC-type asteroids. Tholen has also flagged the asteroid's spectra as "unusual" (BCU).[1]
In March 2011, a rotationallightcurve ofAbanderada was obtained from photometric observations by French amateur astronomersPierre Antonini. The lightcurve with a period of 19.2 hours was later retracted due to its poor quality (U=n.a.).[11] As of 2017, the body's effectiverotation period, poles and shape remain unknown.[3]
According to the survey carried out by theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Abanderada measures between 29.508 and 31.74 kilometers in diameter and its surface has analbedo between 0.06 and 0.093,[5][6][7] while the JapaneseAkari satellite found a diameter of 36.49 kilometers with an albedo of 0.061.[8]
TheCollaborative Asteroid Lightcurve Link adopts the results obtained by theInfrared Astronomical Satellite, that is, an albedo of 0.0523 and a diameter of 39.28 kilometers based on anabsolute magnitude of 10.85.[3]
Thisminor planet was named in afterEva Perón (1919–1952), wife of PresidentJuan Perón (1895–1974) of Argentina. The name "Abanderada" may be translated from Spanish as "woman with a banner"—an appellation frequently used in reference to her as a crusader for social and political change.[2]
The discoverer also named the asteroids1569 Evita,1582 Martir,1588 Descamisada and1589 Fanatica in tribute to Eva Perón.[2] The officialnaming citation was published by theMinor Planet Center in January 1953 (M.P.C. 877).[12]
