1081 Reseda

1081 Reseda (prov. designation: 1927 QF) is a dark background asteroid from the outer regions of the asteroid belt. It was discovered on 31 August 1927, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany.^[4] The asteroid has a rotation period of 7.3 hours and measures approximately 37 kilometers (23 miles) in diameter. It was named after the herbaceous plant Reseda.^[3]

1081 Reseda

Modelled shape of Reseda from its lightcurve
Discovery[1]
Discovered by	K. Reinmuth
Discovery site	Heidelberg Obs.
Discovery date	31 August 1927
Designations
MPC designation	(1081) Reseda
Pronunciation	/rɪˈsiːdə/[2]
Named after	Resēda (mignonette) (herbaceous plant)[3]
Alternative designations	1927 QF · 1949 UA1 1975 LS
Minor planet category	main-belt[4][1] · (outer) background[5][6]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	89.85 yr (32,816 days)
Aphelion	3.5567 AU
Perihelion	2.6505 AU
Semi-major axis	3.1036 AU
Eccentricity	0.1460
Orbital period (sidereal)	5.47 yr (1,997 days)
Mean anomaly	167.25°
Mean motion	0° 10m 49.08s / day
Inclination	4.2029°
Longitude of ascending node	30.443°
Argument of perihelion	7.5205°
Physical characteristics
Dimensions	31.60±11.05 km[7] 35.66±0.70 km[8] 37.03±8.13 km[9] 37.810±0.219 km[10] 37.89±0.46 km[11] 37.97 km (derived)[12] 40.462±0.470 km[13]
Synodic rotation period	7.3002±0.0006 h[14] 7.30136±0.00001 h[15]
Pole ecliptic latitude	(92.0°, −69.0°) (λ1/β1)[6] (256.0°, −76.0°) (λ2/β2)[6]
Geometric albedo	0.0326±0.0026[13] 0.042±0.002[8] 0.043±0.006[10] 0.0488 (derived)[12] 0.049±0.008[11] 0.06±0.02[9] 0.09±0.07[7]
Spectral type	C (assumed)[12]
Absolute magnitude (H)	11.00[12][7][11] · 11.1[1] · 11.16[9] · 11.30[8][13]

Orbit and classification

Reseda is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.^[5][6] It orbits the Sun in the outer asteroid belt at a distance of 2.7–3.6 AU once every 5 years and 6 months (1,997 days; semi-major axis of 3.10 AU). Its orbit has an eccentricity of 0.15 and an inclination of 4° with respect to the ecliptic.^[1] The body's observation arc begins at Heidelberg in September 1927, or 26 days after its official discovery observation.^[4]

Naming

This minor planet was named after the herbaceous plant Reseda (also known as "weld", "dyer's rocket" and "bastard rocket") a genus of Old World herbs of the mignonette family. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 102).^[3]

Reinmuth's flowers

Due to his many discoveries, Karl Reinmuth submitted a large list of 66 newly named asteroids in the early 1930s. The list covered his discoveries with numbers between (1009) and (1200). This list also contained a sequence of 28 asteroids, starting with 1054 Forsytia, that were all named after plants, in particular flowering plants (also see list of minor planets named after animals and plants).^[16]

Physical characteristics

Reseda is an assumed carbonaceous C-type asteroid.^[12]

Rotation period

In August 2008, a rotational lightcurve of Reseda was obtained from photometric observations. Lightcurve analysis gave a well-defined rotation period of 7.3002 hours with a brightness amplitude of 0.34 magnitude (U=3).^[14]

Poles

A 2016-published lightcurve, using modeled photometric data from the Lowell Photometric Database, gave a concurring period of 7.30136 hours, as well as two spin axis of (92.0°, −69.0°) and (256.0°, −76.0°) in ecliptic coordinates (λ, β).^[15]

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Reseda measures between 31.60 and 40.462 kilometers in diameter and its surface has an albedo between 0.0326 and 0.09.^{[7][8][9][10][11][13]} The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0488 and a diameter of 37.97 kilometers based on an absolute magnitude of 11.0.^[12]