732 Tjilaki

732 Tjilaki
	Modelled shape of Tjilaki from its lightcurve
Discovery
Discovered by	A. Massinger
Discovery site	Heidelberg Obs.
Discovery date	15 April 1912
Designations
MPC designation	(732) Tjilaki
Pronunciation	Malay: [tʃiˈlaki]
Named after	Cilaki River; (River in Indonesia)
Alternative designations	A912 HK · 1958 FC; 1912 OR
Minor planet category	main-belt · (inner); background;
Orbital characteristics
	Epoch 31 May 2020 (JD 2459000.5)
	Uncertainty parameter 0
Observation arc	106.66 yr (38,959 d)
Aphelion	2.5633 AU
Perihelion	2.3490 AU
Semi-major axis	2.4561 AU
Eccentricity	0.0436
Orbital period (sidereal)	3.85 yr (1,406 d)
Mean anomaly	359.80°
Mean motion	0° 15m 21.96s / day
Inclination	10.994°
Longitude of ascending node	173.35°
Argument of perihelion	64.900°
Physical characteristics
Mean diameter	29.791±0.431 km; 36.49±0.43 km; 37.61±1.6 km;
Synodic rotation period	12.34±0.01 h
Pole ecliptic latitude	(160.0°, 23.0°) (λ1/β1); (353.0°, 24.0°) (λ2/β2);
Geometric albedo	0.0655±0.006; 0.070±0.002; 0.138±0.024;
Spectral type	D (S3OS2); D (polarimetric);
Absolute magnitude (H)	10.40; 10.5; 10.70;

732 Tjilaki (provisional designation A912 HK or 1912 OR) is a dark background asteroid, approximately 36 kilometers (22 miles) in diameter, located in the inner region of the asteroid belt. It was discovered by German astronomer Adam Massinger at the Heidelberg Observatory on 15 April 1912, and later named after the Cilaki (Tjilaki in pre-reform spelling) river in Indonesia. The dark D-type asteroid has a rotation period of 12.3 hours. It was an early candidate to be visited by the Rosetta spacecraft which eventually rendezvoused comet 67P/Churyumov–Gerasimenko.