1707 Chantal

1707 Chantal, provisional designation 1932 RL, is a stony background asteroid from the Florian region in the inner asteroid belt, approximately 7.5 kilometers (4.7 miles) in diameter. It was discovered on 8 September 1932, by astronomer Eugène Delporte at the Royal Observatory of Belgium in Uccle.^[1] The S-type asteroid has a rotation period of at least 10 hours.^[10] It was named for Chantal, the niece of Belgian astronomer Georges Roland.^[1]

1707 Chantal

Discovery[1]
Discovered by	E. Delporte
Discovery site	Uccle Obs.
Discovery date	8 September 1932
Designations
MPC designation	(1707) Chantal
Named after	Niece of astronomer Georges Roland[1]
Alternative designations	1932 RL · 1942 TC 1950 BF1 · 1955 QA1 A906 YJ
Minor planet category	main-belt[1][2] · (inner) background[3][4]
Orbital characteristics[2]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 0
Observation arc	111.83 yr (40,847 d)
Aphelion	2.5989 AU
Perihelion	1.8390 AU
Semi-major axis	2.2189 AU
Eccentricity	0.1712
Orbital period (sidereal)	3.31 yr (1,207 d)
Mean anomaly	37.923°
Mean motion	0° 17m 53.52s / day
Inclination	4.0315°
Longitude of ascending node	6.1128°
Argument of perihelion	42.974°
Physical characteristics
Mean diameter	7.459±0.114 km[5][6] 7.578±0.291 km[7] 7.62±1.37 km[8]
Synodic rotation period	10 h (at least)[9]
Geometric albedo	0.28[8] 0.2969[7] 0.306[6][5]
Spectral type	Tholen = S[2][10] B–V = 0.870[2] U–B = 0.530[2]
Absolute magnitude (H)	12.54[1][2][5][7][10] 12.79[8]

Orbit and classification

According to modern HCM-analyses by Nesvorný, as well as by Milani and Knežević, Chantal is a non-family asteroid from the main belt's background population.^[3][4] In an older HCM-analysis (Zappalà (1990–97), it is a member of the Flora family (402), a giant asteroid family and the largest family of stony asteroids in the main-belt.^[3] It orbits the Sun in the inner asteroid belt at a distance of 1.8–2.6 AU once every 3 years and 4 months (1,207 days; semi-major axis of 2.22 AU). Its orbit has an eccentricity of 0.17 and an inclination of 4° with respect to the ecliptic.^[2] The asteroid was first observed as A906 YJ at the Heidelberg Observatory in December 1906. The body's observation arc begins at Uccle Observatory in October 1932, or seven weeks after its official discovery observation.^[1]

Naming

This minor planet was named by the discoverer Eugène Delporte after Chantal, a niece of Belgian astronomer Georges Roland (1922–1991) at of Uccle and co-discoverer of the Comet Arend–Roland.^[1] The official naming citation was published by the Minor Planet Center on 8 April 1982 (M.P.C. 6832).^[11] Asteroid 1711 Sandrine was also named by the discoverer after a (grand)-niece of Roland.

Physical characteristics

In the Tholen classification, Chantal is a common, stony S-type asteroid.^[2][3]

Rotation period

In October 1975, a rotational lightcurve of Chantal was obtained from photometric observations by Swedish astronomer Claes-Ingvar Lagerkvist at the Uppsala Astronomical Observatory. Analysis of the fragmentary lightcurve gave a rotation period of at least 10 hours with a brightness amplitude of more than 0.2 magnitude (U=1).^[9]

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Chantal measures between 7.46 and 7.62 kilometers in diameter and its surface has an albedo between 0.28 and 0.31.^[5][6][7][8] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a stony asteroid of 0.20 and calculates a diameter of 9.23 kilometers based on an absolute magnitude of 12.54.^[10]