1563 Noël, provisional designation 1943 EG, is a stony Flora asteroid from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered on 7 March 1943, by Belgian astronomer Sylvain Arend at the Royal Observatory of Belgium in Uccle, and named after his son.[2][6]
Discovery[1] | |
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Discovered by | S. Arend |
Discovery site | Uccle Obs. |
Discovery date | 7 March 1943 |
Designations | |
MPC designation | (1563) Noël |
Named after | Emanuel Arend (discoverer's son)[2] |
Alternative designations | 1943 EG · 1930 EF |
Minor planet category | 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 | 2.3789 AU |
Perihelion | 2.0037 AU |
Semi-major axis | 2.1913 AU |
Eccentricity | 0.0856 |
Orbital period (sidereal) | 3.24 yr (1,185 days) |
Mean anomaly | 347.57° |
Mean motion | 0° 18m 13.68s / day |
Inclination | 5.9829° |
Longitude of ascending node | 53.649° |
Argument of perihelion | 116.41° |
Physical characteristics | |
Dimensions | 7.23±0.51 km[4] 8.98 km (calculated)[3] |
Synodic rotation period | 3.5483±0.0003 h[lower-alpha 1] 3.5486±0.0002 h[lower-alpha 1] 3.5488±0.0001 h[lower-alpha 1] 3.5495±0.0001 h[lower-alpha 1] 3.550±0.002 h[5] |
Geometric albedo | 0.24 (assumed)[3] 0.370±0.051[4] |
Spectral type | SMASS = Sa[1] · S[3] |
Absolute magnitude (H) | 12.4[1][3][4] |
Noël is a member of the Flora 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 an eccentricity of 0.09 and an inclination of 6° with respect to the ecliptic.[1] Noël was first identified as 1930 EF at the Crimean Simeiz Observatory in 1930, extending its observation arc by 13 years prior to its official discovery observation.[6]
The S-type asteroid is characterized as a transitional Sa-subtype on the SMASS taxonomic scheme.[1]
Between April 2008 and June 2015, five rotational lightcurves were obtained from photometric observations by Czech astronomer Petr Pravec at the Ondřejov Observatory near Prague. All lightcurves show a well-defined rotation period between 3.548 and 3.550 hours with a brightness variation of 0.15 to 0.18 in magnitude (U=3).[lower-alpha 1]
In April 2008, a photometric observation by astronomer Julian Oey at the Kingsgrove Observatory, Australia, gave a concurring period of 3.550±0.002 hours and an amplitude of 0.14 (U=3).[5]
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Noël measures 7.2 kilometers in diameter and its surface has a high albedo of 0.37,[4] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the family's principal body and namesake – and calculates a larger diameter of 9.0 kilometers.[3]
This minor planet was named in honor of the discoverer's son, Emanuel Arend (H 138).[2]
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