1563 Noël

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]

1563 Noël
Discovery[1]
Discovered byS. Arend
Discovery siteUccle Obs.
Discovery date7 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 arc87.06 yr (31,799 days)
Aphelion2.3789 AU
Perihelion2.0037 AU
2.1913 AU
Eccentricity0.0856
3.24 yr (1,185 days)
347.57°
0° 18m 13.68s / day
Inclination5.9829°
53.649°
116.41°
Physical characteristics
Dimensions7.23±0.51 km[4]
8.98 km (calculated)[3]
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]
0.24 (assumed)[3]
0.370±0.051[4]
SMASS = Sa[1] · S[3]
12.4[1][3][4]

    Orbit and classification

    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]

    Physical characteristics

    The S-type asteroid is characterized as a transitional Sa-subtype on the SMASS taxonomic scheme.[1]

    Rotation period

    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]

    Diameter and albedo

    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]

    Naming

    This minor planet was named in honor of the discoverer's son, Emanuel Arend (H 138).[2]

    Notes
    1. Pravec (2008, 2011, 2013, 2015) web: rotation period of 3.5495±0.0001, 3.5483±0.0003, 3.5488±0.0001 and 3.5486±0.0002 hours with a brightness amplitude of 0.15 mag. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (1563) Noel and Pravec, P.; Wolf, M.; Sarounova, L. (2011, 2013, 2015)

    References
    1. "JPL Small-Body Database Browser: 1563 Noel (1943 EG)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Retrieved 5 June 2017.
    2. Schmadel, Lutz D. (2007). "(1563) Noël". Dictionary of Minor Planet Names – (1563) Noël. Springer Berlin Heidelberg. p. 124. doi:10.1007/978-3-540-29925-7_1564. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1563) Noel". Asteroid Lightcurve Database (LCDB). Retrieved 18 May 2016.
    4. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8.
    5. Oey, Julian (January 2009). "Lightcurve Analysis of Asteroids from Leura and Kingsgrove Observatories in the First Half of 2008". The Minor Planet Bulletin. 36 (1): 4–6. Bibcode:2009MPBu...36....4O. ISSN 1052-8091.
    6. "1563 Noel (1943 EG)". Minor Planet Center. Retrieved 19 April 2016.

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