.png) Lightcurve-based 3D-model ofLeonce | |
| Discovery[1] | |
|---|---|
| Discovered by | F. Rigaux |
| Discovery site | Uccle Obs. |
| Discovery date | 21 February 1936 |
| Designations | |
| (1378) Leonce | |
Named after | Leonce Rigaux[2] (discoverer's father) |
| 1936 DB · 1958 FG 1958 GY · 1962 KB A915 RC · A915 WA | |
| main-belt · (inner)[3] Nysa[4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 101.54 yr (37,088 days) |
| Aphelion | 2.7300AU |
| Perihelion | 2.0187 AU |
| 2.3743 AU | |
| Eccentricity | 0.1498 |
| 3.66yr (1,336 days) | |
| 38.698° | |
| 0° 16m 9.84s / day | |
| Inclination | 3.5913° |
| 43.568° | |
| 202.15° | |
| Physical characteristics | |
| Dimensions | 14.94±3.81 km[5] 18.16 km(derived)[3] 18.18±1.4 km[6] 20.54±0.13 km[7] 21.228±0.070 km[8] 22.20±0.33 km[9] 22.456±0.170 km[10] |
| 4.3250±0.0002h[11] 4.325±0.001 h[12] 4.32527±0.00005 h[13] 4.3586±0.0002 h[11] | |
| 0.0348±0.0046[10] 0.053±0.002[9] 0.061±0.002[7] 0.0706(derived)[3] 0.0773±0.013[6] 0.10±0.05[5] | |
| C(assumed)[3] | |
| 11.94±0.22[14] · 12.10[6][7][9][10] · 12.20[1][3][5] | |
1378 Leonce, provisional designation1936 DB, is a dark Nysianasteroid from the inner regions of theasteroid belt, approximately 19 kilometers in diameter. It was discovered on 21 February 1936, by Belgian astronomerFernand Rigaux at theRoyal Observatory of Belgium in Uccle, who named it after his father, Leonce Rigaux.[2][15]
Leonce is a member of theNysa family (405),[4] also known as the Nysa-Polana complex, the largest grouping of almost 20 thousand known asteroids in the main belt, consisting of several sub-asteroid families.[16]: 23
It orbits the Sun in theinner asteroid belt at a distance of 2.0–2.7 AU once every 3 years and 8 months (1,336 days). Its orbit has aneccentricity of 0.15 and aninclination of 4° with respect to theecliptic.[1]
The asteroid was first identified as1915 RC atHeidelberg Observatory in September 1915. One week later, the body'sobservation arc begins atBergedorf Observatory, more than 20 years prior to its official discovery observation at Uccle.[15]
Leonce is an assumed carbonaceousC-type asteroid.[3]
In 2002, 2007 and 2017, three rotationallight curves ofLeonce were obtained from photometric observations by amateur astronomersRené Roy,Laurent Bernasconi and Daniel Klinglesmith and colleagues at Etscorn Observatory (719), respectively. Analysis gave a well-defined light curve with a consolidatedrotation period of 4.3250 hours and a brightness amplitude between 0.49 and 0.63magnitude (U=3/3/3).[3][11][12]
In addition a modeled light curve, using photometric data from various sources, gave a period of 4.32527 hours, as well as two spin axes of (210.0°, −67.0°) and (46.0°, −77.0°) inecliptic coordinates.[13]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Leonce measures between 14.94 and 22.456 kilometers in diameter and its surface has analbedo between 0.0348 and 0.10.[5][6][7][8][9][10]
TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.0706 and a diameter of 18.16 kilometers based on anabsolute magnitude of 12.2.[3]
Thisminor planet was named after Leonce Rigaux, father of the discoverer astronomerFernand Rigaux. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 125).[2]
