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Globules located far and close to the central star present different characteristics. On the near side of the Helix Nebula, the central dusty globule of each cometary knot appears dark against the background as it absorbs the [O III ] 5007 Angstrom light emitted in the nebular envelope.
The word comet derives from the Old English cometa from the Latin comēta or comētēs. That, in turn, is a romanization of the Greek κομήτης 'wearing long hair', and the Oxford English Dictionary notes that the term (ἀστὴρ) κομήτης already meant 'long-haired star, comet' in Greek.
Comet Tucker, formally designated as C/2004 Q1, is a faint non-periodic comet that had a very distant perihelion on 11 December 2004. It was the second of two comets discovered by famed amateur astronomer, Roy A. Tucker .
Soon after the first orbital elements could be calculated, it was suggested that the comet would become "a bright object, that could be observed with unaided eye."It was found to combine three favorable characteristics that made it an exceptional comet for observation: a short perihelion distance, a short distance from Earth, and high intrinsic brightness. [9]
The comet was characterised by its very low activity, resembling a manx comet. The comet showed no emission from C2, C3 and CN , which are part of the typical spectrum of comet, when it was 2,83 AU from the Sun, but they were detected when the comet reached 2,3 AU from the Sun. [ 10 ] The comet was observed by the SWAN instrument onboard SOHO ...
This unique spiral galaxy, which is situated 3.2 billion light-years from the Earth, has an extended stream of bright blue knots and diffuse wisps of young stars. [2] It rushes at 3.6 million km/h (1000km/s [2]) through the cluster Abell 2667 and therefore, like a comet, shows a tail, with a length of 600,000 light-years.
Stardust's discovery of crystalline silicates in the dust of comet Wild 2 implies that the dust formed above glass temperature (> 1000 K) in the inner disk region around a hot young star, and was radially mixed in the solar nebula from the inner regions a larger distance from the star or the dust particle condensed in the outflow of evolved red ...
The comet was favorably located in the sky to be observed by the International Ultraviolet Explorer. Comet Bradfield was the third comet whose ultraviolet spectrum was obtained from space after comets C/1975 V1 (West) and C/1978 T1 (Seargent). The observations started on 10 January 1980, when the comet was at an heliocentric distance of 0.71 AU ...