4358 Lynn

4358 Lynn, provisional designation A909 TF, is a stony Eunomia asteroid from the central region of the asteroid belt, approximately 10 kilometers in diameter. It was discovered by British astronomer Philip Herbert Cowell at the Royal Greenwich Observatory on 5 October 1909.^[7] It was named for William Lynn, an assistant astronomer at the discovering observatory.^[2]

4358 Lynn

Discovery[1]
Discovered by	P. H. Cowell
Discovery site	Greenwich Obs.
Discovery date	5 October 1909
Designations
MPC designation	(4358) Lynn
Named after	William Thynne Lynn (astronomer and author)[2]
Alternative designations	A909 TF · 1943 VB 1981 TO1 · 1985 SD6 1988 GK
Minor planet category	main-belt · Eunomia[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	107.67 yr (39,325 days)
Aphelion	3.0579 AU
Perihelion	2.1567 AU
Semi-major axis	2.6073 AU
Eccentricity	0.1728
Orbital period (sidereal)	4.21 yr (1,538 days)
Mean anomaly	296.97°
Mean motion	0° 14m 2.76s / day
Inclination	13.084°
Longitude of ascending node	15.249°
Argument of perihelion	260.32°
Physical characteristics
Dimensions	9.12±0.37 km[4] 10.53 km (calculated)[3]
Synodic rotation period	3.8377±0.0006 h[5]
Geometric albedo	0.21 (assumed)[3] 0.307±0.034[4]
Spectral type	S[3]
Absolute magnitude (H)	12.10[4] · 12.2[1][3] · 12.84±0.64[6]

Orbit and classification

Lynn is a member of the Eunomia family, a large group of stony asteroids and the most prominent family in the intermediate main-belt. It orbits the Sun in the central main-belt at a distance of 2.2–3.1 AU once every 4 years and 3 months (1,538 days). Its orbit has an eccentricity of 0.17 and an inclination of 13° with respect to the ecliptic.^[1] No precoveries or identifications were made prior to its discovery, and the asteroid's observation arc begins in 1909.^[7]

Physical characteristics

Diameter and albedo

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Lynn measures 9.1 kilometers in diameter and its surface has a high albedo of 0.307.^[4] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for members of the Eunomia family of 0.21 and calculates a diameter of 10.5 kilometers with an absolute magnitude of 12.2.^[3]

Lightcurve

In April 2009, a rotational lightcurve of Lynn was obtained from photometric observations made at the Oakley Southern Sky Observatory (E09) in Australia. Lightcurve analysis gave a well-defined rotation period of 3.8377 hours with a brightness variation of 0.60 in magnitude (U=3).^[5]

Naming

This minor planet is named for William Thynne Lynn (1835–1911), who worked for many years as an assistant at the Royal Greenwich Observatory during the second half of the 19th century. He was also an author of various well received books and many short notes on astronomical topics, which were printed in The Observatory.^[2] It was named by the Minor Planet Names Committee after a proposal by Brian G. Marsden.^[7] The approved naming citation was published by the Minor Planet Center on 1 September 1993 (M.P.C. 22501).^[8]