1825 Klare

1825 Klare (prov. designation: 1954 QH) is a background asteroid from the central region of the asteroid belt, approximately 15 kilometers in diameter. It was discovered on 31 August 1954, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany.^[13] The asteroid was named after Heidelberg astronomer Gerhard Klare.^[2]

1825 Klare

Shape model of Klare from its lightcurve
Discovery[1]
Discovered by	K. Reinmuth
Discovery site	Heidelberg Obs.
Discovery date	31 August 1954
Designations
MPC designation	(1825) Klare
Named after	Gerhard Klare (German astronomer)[2]
Alternative designations	1954 QH · 1934 CH 1952 DW2 · 1954 SB 1954 SF · 1954 UF1 1969 AV
Minor planet category	main-belt · (middle)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	83.12 yr (30,360 days)
Aphelion	2.9839 AU
Perihelion	2.3702 AU
Semi-major axis	2.6771 AU
Eccentricity	0.1146
Orbital period (sidereal)	4.38 yr (1,600 days)
Mean anomaly	71.010°
Mean motion	0° 13m 30s / day
Inclination	4.0342°
Longitude of ascending node	288.67°
Argument of perihelion	142.57°
Physical characteristics
Dimensions	14.69±0.82 km[4] 19.21 km (calculated)[3]
Synodic rotation period	4.7410±0.0001 h[a] 4.74173±0.00007 h[5] 4.7421±0.0001 h[6] 4.74288±0.00005 h[7] 4.742885±0.000001 h[8] 4.7429±0.0003 h[9] 4.7431±0.0001 h[10] 4.744 h[11]
Geometric albedo	0.10 (assumed)[3] 0.167±0.021[4]
Spectral type	S/C[3]
Absolute magnitude (H)	11.7[1][3] · 11.80[4] · 11.91±0.24[12]

Orbit and classification

The presumably stony asteroid orbits the Sun in the central main-belt at a distance of 2.4–3.0 AU once every 4 years and 5 months (1,600 days). Its orbit has an eccentricity of 0.11 and an inclination of 4° with respect to the ecliptic.^[1] First identified as 1934 CH at Uccle Observatory in 1934, Klare's observation arc begins 20 years prior to its official discovery observation.^[13]

Naming

Klare was named after Gerhard Klare (born 1932), an observing astronomer at Heidelberg Observatory since 1960, whose fields of interest include minor planets.^[2] He is also known for his numerous contributions in the yearbook series "Reviews in Modern Astronomy" of the Astronomische Gesellschaft. The official naming citation was published by the Minor Planet Center on 18 April 1977 (M.P.C. 4156).^[14]

Physical characteristics

Rotation period

Klare has been the subject of multiple photometric lightcurve studies, which gave a well-determined rotation period between 4.741 and 4.744 hours with a brightness variation between 0.70 and 0.90 magnitude (U=3/n.a.).^{[5][7][8][9][10][11]} Measurements have also been used as the basis for generating a three-dimensional model of its shape.^[6] The Collaborative Asteroid Lightcurve Link (CALL) adopts a period 4.744 hours with an amplitude of 0.70 magnitude (U=3).^[3]

Diameter and albedo

According to the survey carried out by the Japanese Akari satellite, Klare measures 14.69 kilometers in diameter, and its surface has an albedo of 0.167,^[4] while CALL assumes an albedo of 0.10 – a compromise value for asteroids with a semi-major axis between 2.6 and 2.7 AU, for which neither a S (0.20) nor a C (0.057) type has been determined – and calculates a diameter of 19.21 kilometers with an absolute magnitude of 11.7.^[3]

Notes

1. Hamanowa 2011, web publication, summary figures given in the Light Curve Data Base – (1825) Klare