_Banachiewicza.png) Modelled shape ofBanachiewicza | |
| Discovery[1] | |
|---|---|
| Discovered by | S. Arend |
| Discovery site | Uccle Obs. |
| Discovery date | 25 August 1933 |
| Designations | |
| (1286) Banachiewicza | |
Named after | Tadeusz Banachiewicz[2] (Polish astronomer) |
| 1933 QH · 1928 SE 1954 UJ | |
| main-belt · (outer)[3] Eos[4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 88.78 yr (32,428 days) |
| Aphelion | 3.2926AU |
| Perihelion | 2.7553 AU |
| 3.0240 AU | |
| Eccentricity | 0.0888 |
| 5.26yr (1,921 days) | |
| 29.653° | |
| 0° 11m 14.64s / day | |
| Inclination | 9.7486° |
| 200.46° | |
| 107.58° | |
| Physical characteristics | |
| 8.631±0.001 h[8] | |
| Tholen =S[1][3] B–V = 0.850[1] U–B = 0.430[1] | |
| 10.626±0.009(R)[10] · 10.88[1][3][6][7] | |
1286 Banachiewicza (prov. designation:1933 QH) is an elongatedEos asteroid from the outer regions of theasteroid belt. It was discovered on 25 August 1933, by Belgian astronomerSylvain Arend at theRoyal Observatory of Belgium in Uccle.[11] The stonyS-type asteroid has arotation period of 8.6 hours and measures approximately 21 kilometers (13 miles) in diameter. It was named after Polish astronomerTadeusz Banachiewicz.[2]
Banachiewicza is a member theEos family (606),[4] the largestasteroid family in theouter main belt consisting of nearly 10,000 asteroids.[12]: 23 It orbits the Sun at a distance of 2.8–3.3 AU once every 5 years and 3 months (1,921 days). Its orbit has aneccentricity of 0.09 and aninclination of 10° with respect to theecliptic.[1] The body'sobservation arc begins with its first observation as1928 SE atHeidelberg Observatory in September 1928, almost five years prior to its official discovery observation at Uccle.[11]
Thisminor planet was named after Polish astronomerTadeusz Banachiewicz (1882–1954), who was also a prominent mathematician and geodesist, as well as the director of the Kraków Observatory (055) and vice-president of theInternational Astronomical Union in the 1930s. The subsequently numbered asteroid1287 Lorcia – also discovered by Sylvain Arend, and also an Eoan asteroid – was named after his wife. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 118). The lunar craterBanachiewicz was also named in his honor.[2]
In theTholen classification,Banachiewicza is a stonyS-type asteroid,[1] while the overallspectral type of the Eos family is that of aK-type.[12]: 23
.png)
In August 2008, the best-rated rotationallightcurve ofBanachiewicza was obtained from photometric observations by French amateur astronomersLaurent Bernasconi,Cyril Cavadore andStéphane Charbonnel. Lightcurve analysis gave arotation period of 8.631 hours with a brightness variation of 0.54magnitude, indicative for an irregular, elongated shape (U=3).[8]
Other observations at thePalomar Transient Factory in California, and by a collaboration of Hungarian astronomers gave a period of 8.628 and 5 hours with an amplitude of 0.36 and 0.4 magnitude, respectively (U=2/2).[13][10] In 2013, an international study modeled a lightcurve with a concurring period of8.63043±0.00005 hours and found twospin axis of (214.0°, 62.0°) and (64.0°, 60.0°) inecliptic coordinates (λ, β) (Q=2).[9]
According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Banachiewicza measures between 21.474 and 22.569 kilometers in diameter and its surface has analbedo between 0.1554 and 0.171.[5][6][7] TheCollaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 19.82 kilometers based on anabsolute magnitude of 10.88.[3]
