1101 clematis  is an alauda asteroid from the outermost regions of the asteroid belt, approximately 37 kilometers in diameter.it was discovered on 22 september 1928, by german astronomer karl reinmuth at the heidelberg-königstuhl state observatory in southwest germany, and assigned the provisional designation 1928 sj.it was named for the flowering plant clematis.the presumably carbonaceous asteroid has a relatively long rotation period of 34.3 hours.: 23  according to a different study, this object is also the namesake of the clematis family, a small family of 5–16 asteroids hence they may have arisen from the same collisional event.all members have a relatively high orbital inclination.it orbits the sun in the outermost asteroid belt at a distance of 3.0–3.5 au once every 5 years and 10 months (2,120 days; semi-major axis of 3.23 au).its orbit has an eccentricity of 0.08 and an inclination of 21° with respect to the ecliptic.the body's observation arc begins with its observation as 1963 tg1 at goethe link observatory in october 1963, more than 35 years after its official discovery observation at heidelberg.: 23    === rotation period === in september 2009, a rotational lightcurve of clematis was obtained from photometric observations by american astronomers brian warner at the palmer divide observatory, colorado, and by robert stephens at gmars (g79, california.lightcurve analysis gave a synodic rotation period of 34.3 hours with a brightness amplitude of 0.16 magnitude (u=2), which significantly differs from previously reported periods of 6 to 12.68 hours (u=1/2/2/2).while not being a slow rotator, clematis has a much longer period than that known for most other asteroids, and its small amplitude is indicative for a rather spheroidal shape.the official naming citation was mentioned in the names of the minor planets by paul herget in 1955 (h n.a.).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).
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