Comet Ikeya–Seki

Comet Ikeya–Seki, formally designated C/1965 S1, 1965 VIII, and 1965f, was a long-period comet discovered independently by Kaoru Ikeya and Tsutomu Seki. First observed as a faint telescopic object on September 18, 1965, the first calculations of its orbit suggested that on October 21, it would pass just 450,000 km above the Sun's surface, and would probably become extremely bright.

Comets can defy such predictions, but Ikeya–Seki performed as expected. As it approached perihelion observers reported that it was clearly visible in the daytime sky next to the Sun. In Japan, where it reached perihelion at local noon, it was seen shining at magnitude −10. It proved to be one of the brightest comets seen in the last thousand years, and is sometimes known as the Great Comet of 1965.

The comet was seen to break into three pieces just before its perihelion passage. The three pieces continued in almost identical orbits, and the comet re-appeared in the morning sky in late October, showing a very bright tail. By early 1966, it had faded from view as it receded into the outer solar system.

Comet Humason

Comet Humason, formally designated C/1961 R1 (a.k.a. 1962 VIII and 1961e), was a non-periodic comet discovered by Milton L. Humason on September 1, 1961. Its perihelion was well beyond the orbit of Mars, at 2.133 AU. Its period is 2940 years, and the diameter of its nucleus estimated at about 41 km.

It was a 'giant' comet, much more active than a normal comet for its distance to the Sun, with an absolute magnitude of +1.5, a hundred times brighter than an average new comet. It had an unusually disrupted or 'turbulent' appearance. It was also unusual in that the spectrum of its tail showed a strong predominance of the ion CO+, a result previously seen unambiguously only in Comet Morehouse (C/1908 R1).

References

  • News And Comments — Comets: Comet Humason 1961e', Irish Astronomical Journal, Vol. 6, p. 191 (1964)
  • 8 (number)

    8 (eight /ˈt/) is the natural number following 7 and preceding 9.

    In mathematics

    8 is:

  • a composite number, its proper divisors being 1, 2, and 4. It is twice 4 or four times 2.
  • a power of two, being 23 (two cubed), and is the first number of the form p3, p being an integer greater than 1.
  • the first number which is neither prime nor semiprime.
  • the base of the octal number system, which is mostly used with computers. In octal, one digit represents 3 bits. In modern computers, a byte is a grouping of eight bits, also called an octet.
  • a Fibonacci number, being 3 plus 5. The next Fibonacci number is 13. 8 is the only positive Fibonacci number, aside from 1, that is a perfect cube.
  • the only nonzero perfect power that is one less than another perfect power, by Mihăilescu's Theorem.
  • the order of the smallest non-abelian group all of whose subgroups are normal.
  • the dimension of the octonions and is the highest possible dimension of a normed division algebra.
  • the first number to be the aliquot sum of two numbers other than itself; the discrete biprime 10, and the square number 49.
  • Podcasts:

    PLAYLIST TIME:

    Viii

    by: Sapthuran

    And with the mists they gather
    Shadows shifting through the trees
    Black silhouettes
    Move into the clearing
    The air is still
    The world is silent
    The moon lights their eyes
    As they slowly circle
    A howl pierces the night
    The silence is broken
    Their voices cry in unison
    Singing strength and hatred
    In their instinctive fury
    They return to the hunt
    Their cries echo through the trees




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