| Discovery[1] | |
|---|---|
| Discovered by | L. Boyer |
| Discovery site | Algiers Obs. |
| Discovery date | 19 January 1937 |
| Designations | |
| (1412) Lagrula | |
Named after | Philippe Lagrula(astronomer)[2] |
| 1937 BA · 1929 US 1962 XM | |
| main-belt · Flora[3] | |
| Orbital characteristics[1] | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 86.64 yr (31,644 days) |
| Aphelion | 2.4645AU |
| Perihelion | 1.9648 AU |
| 2.2147 AU | |
| Eccentricity | 0.1128 |
| 3.30yr (1,204 days) | |
| 145.58° | |
| 0° 17m 56.4s / day | |
| Inclination | 4.7178° |
| 66.118° | |
| 14.052° | |
| Physical characteristics | |
| Dimensions | 7.78±1.36 km[4] 7.806±0.075 km[5] 9.068±0.047 km[6] 23±3 km[7] 23.98 km(calculated)[3] |
| 5.882±0.001 h[8] 5.9176±0.0001h[7] | |
| 0.058(assumed)[3] 0.06[7] 0.2378±0.0284[6] 0.318±0.044[5] 0.36±0.14[4] | |
| S[3][9] | |
| 11.81±0.04[3][7] · 12.3[1] · 12.4[6] · 12.62[4] · 12.73±0.75[9] | |
1412 Lagrula, provisional designation1937 BA, is anasteroid from the inner regions of theasteroid belt, approximately 7 or 23 kilometers in diameter, depending on the body's divergent reflectivity measurements.
It was discovered on 19 January 1937, by French astronomerLouis Boyer at the North AfricanAlgiers Observatory in Algeria.[10] It was later named after French astronomerPhilippe Lagrula.[2]
Lagrula is a presumed member of theFlora family, a large group of stonyS-type asteroids in the inner main-belt. It orbits the Sun at a distance of 2.0–2.5 AU once every 3 years and 4 months (1,204 days). Its orbit has aneccentricity of 0.11 and aninclination of 5° with respect to theecliptic.[1] First identified as1929 US atLowell Observatory in 1929, the body'sobservation arc was extended by 8 years prior to its official discovery observation at Algiers.[10]
During March and April 2013, photometric observations ofLagrula were made over ten nights by Italian astronomer Giovanni Casalnuovo at Eurac Observatory (C62) in Bolzano, Italy.Lightcurve analysis gave arotation period of 5.9176 hours and a brightness variation of 0.28magnitude (U=2+).[7] In January 2016, a more refined period of 5.882 hours with an amplitude of 0.44 magnitude was obtained from a bimodal lightcurve by Spanish astronomer group OBAS,Observadores de Asteroides (U=3).[8]
According to the survey carried out by NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Lagrula measures 7.8 kilometers in diameter, and its surface has analbedo of 0.318 and 0.36, respectively (most recent results only).[4][5] However, theCollaborative Asteroid Lightcurve Link assumes a carbonaceous albedo of 0.058 and calculates a diameter of 23.98 kilometers,[3] which is in agreement with Giovanni Casalnuovo, who published a diameter of23±3 and an albedo of 0.06 using an absolute magnitude of 11.81.[7] Casalnuovo assumed aC-type, rather than anS-type, because he found an average V–Rcolor index of0.37±0.05 magnitude.[7]
Thisminor planet was named after French astronomerJoanny-Philippe Lagrula (1870–1941), discoverer of the minor planet775 Lumière and director of theQuito Astronomical Observatory andAlgiers Observatory.[2] Naming citation was neither published inThe Names of the Minor Planets nor in theMinor Planet Circulars, but researched and compiled by astronomer and authorLutz D. Schmadel, based on his private communications with his colleges (LDS).[11]
