| Discovery[1] | |
|---|---|
| Discovered by | S. Arend |
| Discovery site | Uccle Obs. |
| Discovery date | 7 March 1943 |
| Designations | |
| (1563) Noël | |
Named after | Emanuel Arend (discoverer's son)[2] |
| 1943 EG · 1930 EF | |
| main-belt · Flora[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 87.06 yr (31,799 days) |
| Aphelion | 2.3789AU |
| Perihelion | 2.0037 AU |
| 2.1913 AU | |
| Eccentricity | 0.0856 |
| 3.24yr (1,185 days) | |
| 347.57° | |
| 0° 18m 13.68s / day | |
| Inclination | 5.9829° |
| 53.649° | |
| 116.41° | |
| Physical characteristics | |
| Dimensions | 7.23±0.51 km[4] 8.98 km(calculated)[3] |
| 3.5483±0.0003 h[a] 3.5486±0.0002 h[a] 3.5488±0.0001 h[a] 3.5495±0.0001h[a] 3.550±0.002 h[5] | |
| 0.24(assumed)[3] 0.370±0.051[4] | |
| SMASS = Sa[1] · S[3] | |
| 12.4[1][3][4] | |
1563 Noël (provisional designation1943 EG) is a stony Floraasteroid from the inner regions of theasteroid belt, approximately 8 kilometers in diameter. It was discovered on 7 March 1943, by Belgian astronomerSylvain Arend at theRoyal Observatory of Belgium in Uccle, and named after his son.[2][6]
Noël is a member of theFlora family, one of the largest groups of stony asteroids in the main-belt. It orbits the Sun at a distance of 2.0–2.4 AU once every 3 years and 3 months (1,185 days). Its orbit has aneccentricity of 0.09 and aninclination of 6° with respect to theecliptic.[1] Noël was first identified as1930 EF at the CrimeanSimeiz Observatory in 1930, extending itsobservation arc by 13 years prior to its official discovery observation.[6]
TheS-type asteroid is characterized as a transitional Sa-subtype on theSMASS taxonomic scheme.[1]
Between April 2008 and June 2015, five rotationallightcurves of Noël were obtained from photometric observations by Czech astronomerPetr Pravec at theOndřejov Observatory near Prague. All lightcurves show a well-definedrotation period between 3.548 and 3.550 hours with a brightness variation of 0.15 to 0.18 inmagnitude (U=3).[a]
In April 2008, a photometric observation by astronomer Julian Oey at the Kingsgrove Observatory, Australia, gave a concurring period of3.550±0.002 hours and an amplitude of 0.14 (U=3).[5]
According to the survey carried out by NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission, Noël measures 7.2 kilometers in diameter and its surface has a highalbedo of 0.37,[4] while theCollaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from8 Flora, the family's principal body and namesake – and calculates a larger diameter of 9.0 kilometers.[3]
Thisminor planet was named in honor of the discoverer's son, Emanuel Arend (H 138).[2]
