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Obs-V: C/2006 P1 on Jan 8.66 UT

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  • Bjorn H. Granslo
    ***Comet C/2006 P1 (McNaught)*** Jan. 8.66, -1.0*, -- (B. H. Granslo, Nyland, Oslo, Norway, 7x50 binoculars; 3-deg tail; alt 3.9 deg; nautical twilight);
    Message 1 of 1 , Jan 8, 2007
      ***Comet C/2006 P1 (McNaught)***

      Jan. 8.66, -1.0*, -- (B. H. Granslo, Nyland, Oslo, Norway, 7x50
      binoculars; 3-deg tail; alt 3.9 deg; nautical twilight);

      IIIYYYYMnL YYYY MM DD.DD eM/mm.m:r AAA.ATF/xxxx /dd.ddnDC /t.ttmANG ICQ XX*OBSxx
      2006P1 2007 01 08.66 !B -1.0 YG 0.7E 1 9 3 ICQ XX GRA04
      2006P1 2007 01 08.66 !B -0.9 YG 5.0B 7 1.5 8/ 3.0 355 ICQ XX GRA04

      *** Remarks ***
      Jan. 8.66: With naked eye, the comet was very easily seen from 15h40m
      (solar altitude -7.2 deg) and until it set 35 minutes later (at true
      altitude 1.2 deg), it showed an apparently stellar coma and an easily
      seen tail; its brightness was comparable to a magnitude +1 star under
      a dark sky and clearly superiour to Mercury during its most favourable
      maximum elongations; the m1 magnitude was estimated as 0.6 mag fainter
      than Vega and 0.4 mag brighter than Altair. With 7x50 binoculars, the
      comet was distinctly golden yellow in colour; and showed a nearly
      stellar central condensation and a tail that was moderately broad and
      slightly curved clockwise; the tail was bright for the first degree
      and its edges was notably brighter than the region in the middle; the
      m1 estimate was 0.3 mag brighter than Altair and 0.7 mag fainter than
      Vega. The formal magnitude estimates were made at 15h51m at altitude
      3.9 deg and solar altitude -8.3 deg; the deduced magnitudes have been
      corrected for extinction by using a coefficient of 0.15 mag per
      airmass (the sky was very transparent). This observation was made
      from my work location. [GRA04]

      *** Observer ***
      GRA04 = Bjorn H. Granslo.
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