| Discovery[1] | |
|---|---|
| Discovered by | G. Neujmin |
| Discovery site | Simeiz Obs. |
| Discovery date | 31 August 1929 |
| Designations | |
| (1158) Luda | |
Named after | Ludmilla Neujmin (discoverer's sister)[2] |
| 1929 QF · 1954 UQ1 1958 TG1 · 1972 GC | |
| main-belt · Maria[3] · Eunomia[4] | |
| Orbital characteristics[1] | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 87.27 yr (31,876 days) |
| Aphelion | 2.8532AU |
| Perihelion | 2.2742 AU |
| 2.5637 AU | |
| Eccentricity | 0.1129 |
| 4.11yr (1,499 days) | |
| 56.051° | |
| 0° 14m 24.36s / day | |
| Inclination | 14.834° |
| 344.74° | |
| 56.226° | |
| Physical characteristics | |
| Dimensions | 18.636±0.207 km[5] 18.70±0.48 km[6] 19.06±0.8 km(IRAS:8)[7] 20.596±0.130 km[8] |
| 6.86±0.01h[9] 6.863±0.005 h[10] 6.870±0.005 h[11] 6.90±0.01 h[12] 7.44 h[3] | |
| 0.2025±0.0548[8] 0.221±0.034[5] 0.2329±0.022(IRAS:8)[7] 0.253±0.015[6] | |
| S[4][13] | |
| 10.8[1][4][6][7][8] · 10.95±0.33[13] | |
1158 Luda, provisional designation1929 QF, is a stonyasteroid from the middle regions of theasteroid belt, approximately 19 kilometers in diameter. It was discovered on 31 August 1929, by Soviet astronomerGrigory Neujmin atSimeiz Observatory on the Crimean peninsula.[14] It was named after Ludmilla Neujmin, the sister of the discoverer.[2]
Luda orbits the Sun at a distance of 2.3–2.9 AU once every 4 years and 1 month (1,499 days). Its orbit has aneccentricity of 0.11 and aninclination of 15° with respect to theecliptic.[1] The body'sobservation arc begins with its first used observation atJohannesburg Observatory, one month after its official discovery observation at Simeiz.[14]Luda is a stonyS-type asteroid.[13]
Based on its orbital elements,Luda is a member of theEunomia family, a large group of stony asteroids and the most prominent family in the intermediate main-belt, while Argentine astronomer Alvarez-Candal from the Universidad Nacional de Córdoba groups it into the smallerMaria family, which is named after170 Maria (the same discrepancy exists for9175 Graun and2429 Schürer).[3]: 389
Several rotationallightcurves ofLuda were obtained from photometric observations. Analysis of the best-rated lightcurves obtained by French amateur astronomerLaurent Bernasconi, American astronomerBrian Warner, and an international group led by Korean astronomers, gave a well-definedrotation period between 6.86 and 6.87 hours with a brightness variation between 0.13 and 0.22magnitude (U=3/3-/3).[9][10][11] Photometric observations also gave a period of 6.9 and 7.44 hours, but these were derived from a fragmentary and ambiguous light curve, respectively.(U=1/2).[3][12]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite, and NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Luda measures between 18.63 and 20.59 kilometers in diameter and its surface has analbedo between 0.20 and 0.25.[5][6][7][8] TheCollaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.232 and a diameter of 19.06 kilometers with anabsolute magnitude of 10.8.[4]
Thisminor planet was named for Ludmilla Neujmin, the sister of the discoverer. "Luda" is a diminutive of Ludmilla.[2] AstronomerLutz Schmadel, who compiled this naming citation, based it on a private communication with "N. S. Samojlova-Yakhontova", as neither theMinor Planet Circulars norThe Names of the Minor Planets give any information about this asteroid's name.[2][15]
