706 Hirundo

706 Hirundo
	Modelled shape of Hirundo from its lightcurve
Discovery
Discovered by	J. Helffrich
Discovery site	Heidelberg Obs.
Discovery date	9 October 1910
Designations
MPC designation	(706) Hirundo
Pronunciation	/hɪˈrʌndoʊ/
Named after	Hirundo (swallows); (Genus of birds)
Alternative designations	A910 TF · 1948 AE; 1957 DA · 1977 QB; A924 WD · 1910 KX
Minor planet category	main-belt · (middle); background ;
Adjectives	Hirundinian /hɪrənˈdɪniən/
Orbital characteristics
	Epoch 31 May 2020 (JD 2459000.5)
	Uncertainty parameter 0
Observation arc	109.55 yr (40,014 d)
Aphelion	3.2601 AU
Perihelion	2.1987 AU
Semi-major axis	2.7294 AU
Eccentricity	0.1944
Orbital period (sidereal)	4.51 yr (1,647 d)
Mean anomaly	124.52°
Mean motion	0° 13m 6.96s / day
Inclination	14.431°
Longitude of ascending node	325.34°
Argument of perihelion	31.090°
Physical characteristics
Mean diameter	29.22±1.5 km; 29.36±0.79 km; 30.819±0.553 km;
Synodic rotation period	22.027±0.005 h
Pole ecliptic latitude	(92°, 66°) (λ1/β1); (244°, 54°) (λ2/β2);
Geometric albedo	0.081±0.011; 0.172±0.011; 0.1721±0.019;
Spectral type	SMASS = Cgh
Absolute magnitude (H)	10.20; 10.90; 11.0;

706 Hirundo (prov. designation: A910 TF or 1910 KX) is an elongated background asteroid, located in the central region of the asteroid belt. It was discovered by German astronomer Joseph Helffrich at the Heidelberg Observatory on 9 October 1910. The carbonaceous C-type asteroid (Cgh) has a rotation period of 22.0 hours and measures approximately 30 kilometers (19 miles) in diameter. It was named after the bird genus Hirundo, commonly known as swallows.

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