_Lobachevskij.png) Lobachevskij modeled from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | L. Zhuravleva |
| Discovery site | Crimean Astrophysical Obs. |
| Discovery date | 18 August 1972 |
| Designations | |
| (1858) Lobachevskij | |
Named after | Nikolai Lobachevsky (Russian mathematician)[2] |
| 1972 QL · 1928 SG 1936 MH · 1955 VW 1957 BM · 1964 YC | |
| main-belt · (middle)[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 80.42 yr (29,372 days) |
| Aphelion | 2.9086AU |
| Perihelion | 2.4897 AU |
| 2.6992 AU | |
| Eccentricity | 0.0776 |
| 4.43yr (1,620 days) | |
| 98.237° | |
| 0° 13m 20.28s / day | |
| Inclination | 1.6607° |
| 271.91° | |
| 17.726° | |
| Physical characteristics | |
| Dimensions | 10.769±0.189[4] 10.919±0.116 km[5] 13.06 km(calculated)[3] |
| 5.409±0.0115h(S)[6] 5.413±0.003 h[7] 5.4141±0.0115 h(R)[6] 5.435±0.003 h[7] 7.00±0.01 h(dated)[8] | |
| 0.18(assumed)[3] 0.3737±0.0590[5] 0.383±0.055[4] | |
| SMASS =L[1] | |
| 11.5[5] · 11.9[1] · 11.905±0.002(R)[6] · 12.0[3] · 12.368±0.002(S)[6] | |
1858 Lobachevskij (prov. designation:1972 QL) is a rare-typebackground asteroid from the central region of theasteroid belt, approximately 13 kilometers in diameter. It was discovered on 18 August 1972, by Soviet astronomerLyudmila Zhuravleva at theCrimean Astrophysical Observatory in Nauchnyj, on the Crimean peninsula.[9] The asteroid was named after Russian mathematicianNikolai Lobachevsky.[2]
Lobachevskij had already been photographed inprecovery images dating back to the 1930s, providing it with a much largerobservation arc. It orbits the Sun in thecentral main-belt at a distance of 2.5–2.9 AU once every 4 years and 5 months (1,620 days). Its orbit has aneccentricity of 0.08 and aninclination of 2° with respect to theecliptic.[1] First observed as1928 SG atHeidelberg Observatory in 1928, the asteroid's first used observations was aprecovery taken atPalomar Observatory in 1954, extending itsobservation arc by 18 years prior to its official discovery at Nauchnyj.[9]
Thisminor planet was named in honor of mathematicianNikolai Lobachevsky (1792–1856), Russian mathematician and creator of the first comprehensive system of non-Euclidean geometry.[2] The officialnaming citation was published by theMinor Planet Center on 1 June 1975 (M.P.C. 3826).[10]
Lobachevskij is a strongly reddish and relatively uncommonL-type asteroid in theSMASS classification.[1] It has anabsolute magnitude between 11.5 and 12.4.[3]
In May 2011, photometric observation ofLobachevskij gave arotation period of 5.413 and 5.435 hours with a brightness amplitude of 0.30 and 0.33magnitude, respectively (U=2+/2),[7] superseding a previous period of 7.00 hours (U=2).[8]
In September 2012, two rotationallightcurves were obtained in the S- and R-band at thePalomar Transient Factory in California. Lightcurve analysis gave a period of 5.409 and 5.4141 hours with an amplitude of 0.26 and 0.22 magnitude, respectively (U=2/2).[6]
Lobachevskij covered a 10.4 mag star—a phenomenon known as occultation—in the constellation Sagittarius in June 2007. It was predicted that the event could be seen in the northeastern United States and southeast Canada. The combined light magnitude of the bodies would drop momentarily—for a maximum of 2.2 seconds.[11]
According to the survey carried out by NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Lobachevskij measures between 10.769 and 10.919 kilometers in diameter, and its surface has analbedo between 0.3737 and 0.383, respectively,[5][4] while theCollaborative Asteroid Lightcurve Link assumes a lower albedo of 0.18 and calculates a diameter of 12.47 kilometers with anabsolute magnitude of 12.0.[3]
