very bright comet in a retrograde, quasi-parabolic orbit, remarkable for variations in the form and structure of its tail. It was named after Daniel Walter Morehouse, a U.S. astronomer, and was observed from September 1908 to May 1909. On several occasions the tail appeared to break into fragments and to be completely separated from the head. Also, the tail became visible at twice Earth's distance from the Sun (2 astronomical units 【AU】), whereas most comets start to produce a visible tail only at about 1.5 AU from the Sun. These characteristics suggest that Morehouse was a "new" comet, coming straight from the Oort cloud.