Ny komet mag 8.5

Fora ASTRO-FORUM OBSERVATIONER OG VISUEL ASTRONOMI Ny komet mag 8.5

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  • #14759

    lindhard
    Deltager
      • Super Nova

      A small 8th-magnitude comet is now making its way slowly across Cassiopeia toward Perseus. The surprise visitor, called Comet Yi-SWAN, should be within reach of small telescopes for most of April and May 2009. However, bright moonlight will make it a challenge to spot until the second half of April.

      So far, observers describe the comet as a diffuse glow just a few arcminutes across. No one has yet reported a tail, but that could change in the coming days as the Moon’s glare wanes.

      Because of its high declination, Comet Yi-SWAN is theoretically visible all night from mid-northern latitudes. But early rising skywatchers have the best chance, because Cassiopeia is highest during the predawn hours.

      On Saturday evening, April 11th, the comet passes just 0.4° south of Schedar (α Cassiopeiae), so they’ll be in the same low-power telescopic field. On Thursday night, April 23-24, the comet will glide only 1.2° south of the Double Cluster in Perseus.

      The Discovery

      Korean amateur Dae-am Yi was the first person to notice the comet. On March 26th, he obtained two images of it with a Canon 5D camera and 90-mm lens. But word was slow to reach the Central Bureau for Astronomical Telegrams (CBAT) at the Smithsonian Astrophysical Observatory in Cambridge, Massachusetts, the world’s clearinghouse for comet discoveries.

      Independently, Rob Matson reported to CBAT on April 4th that he’d found a possible comet in SWAN images posted on the SOHO website.

      Recognizing that the objects were one and the same, CBAT astronomers announced the find on IAU Circulars 9034 and 9035 and gave it the name Comet Yi-SWAN (C/2009 F6). Preliminary calculations by Brian G. Marsden indicate the comet is traveling in a highly inclined parabolic orbit, tipped 85.7° to the plane of the ecliptic. At perihelion on May 8th, the comet will be 1.27 astronomical units (190 million km) from the Sun and half again farther from Earth.

      The ephemeris below, from Marsden’s orbital elements, gives the comet’s right ascension and declination (equinox 2000.0) at 0 hours Universal Time on selected dates, along with its elongation angle from the Sun, predicted visual magnitude, and the constellation in which it lies.

      Comet Yi-SWAN

      Date
      RA 2000
      Dec.
      Elong.
      Mag. Const.
      0h UT
      h m
      ° ‘
      °
      Apr 8
      0 08.8
      +55 17
      50
      8.5
      Cas
      Apr 10
      0 25.4
      +55 48
      49
      8.5
      Cas
      Apr 12
      0 42.3
      +56 12
      48
      8.5
      Cas
      Apr 14
      0 59.5
      +56 28
      47
      8.5
      Cas
      Apr 16
      1 16.6
      +56 36
      47
      8.4
      Cas
      Apr 18
      1 33.7
      +56 36
      46
      8.4
      Cas
      Apr 20
      1 50.5
      +56 29
      45
      8.4
      Per
      Apr 22
      2 07.0
      +56 13
      44
      8.4
      Per
      Apr 24
      2 23.0
      +55 51
      43
      8.4
      Per
      Apr 26
      2 38.5
      +55 23
      42
      8.4
      Per
      Apr 28
      2 53.3
      +54 49
      41
      8.4
      Per
      Apr 30
      3 07.4
      +54 10
      40
      8.4
      Per
      May 2
      3 20.9
      +53 26
      39
      8.4
      Per
      May 4
      3 33.6
      +52 38
      38
      8.4
      Per
      May 6
      3 45.7
      +51 48
      37
      8.5
      Per
      May 8
      3 57.1
      +50 54
      36
      8.5
      Per

      mvh
      Lars

      #14792

      palle.b.
      Deltager
        • Nova

        Har ledt her til aften mellem solnedgang og måne opgang…..Smile

        men det lykkedes ikke, ud over en nu lys himmel mod Nord, så er der nogle

        tynde skyer der ikke gør det lettere Confused

        Har andre her på Astro Forum set der lille ny ?
        #14806

        johnni.gade
          • Giant

          wohoo, skal helt sikkert lede efter denne i weekenden.

          #14833

          palle.b.
          Deltager
            • Nova

            Kan ikke finde Yi-SWAN …..

            nå håber vejeret er lige så flot i morgen. (seeing er fantastisk her nu men skal tidligt op Confused )
            #14854

            johnni.gade
              • Giant

              Tror det bliver i aften jeg forsøger 🙂

              #14866

              palle.b.
              Deltager
                • Nova

                Har forsøgt at fange den lille nullermand siden 22:30 til 00:00 – uden held-

                Confused
                #15010

                palle.b.
                Deltager
                  • Nova

                  Har nogen set Comet Yi-SWAN – man fristes til at sige “Comet or no Comet” Big%20smile

                  #15012

                  wieben
                  Deltager
                    • Nova

                    Kometen er tæt ved PacMan nebula. På CN er der en der har snuppet den med DSLR

                    #15051

                    palle.b.
                    Deltager
                      • Nova

                      Det kan ikke passe at de englendere har held i sprøjten/teleskobet nogen burde

                      kunne fange en Mag.8,5 her også…
                      #15058

                      pbm77
                        • Moon

                        Nu er mag. 8.5 jo ikke bare mag. 8.5. Kommer jo meget an på DC eller hvad det hedder, altså hvor klar en kerne den har og hvor stor den er. Lidt det samme som med galakser. M101 er jo også opgivet til 8.3 eller sådan noget, men er spredt ud over et stort område og derfor reelt set meget svagere.

                        Men prøves det skal den helt sikkert hvis/når muligheden byder sig (visuelt altså)

                        #15156

                        Lars Malmgren
                        Deltager
                          • Super Nova

                          I aften står den på position RA: 01h 33′ 05″ DEC: +56* 36′ 19″.
                          Jeg har den med sikkerhed i kassen, men den er godt nok lille bitte !

                          #15201

                          nightsky
                          Deltager
                            • Neutron star

                            Here you go

                            Var ganske fornøjelig at følge på monitorene i service bygningen. Tydeligt den flyttede sig mellem hver mundfuld kaffe.

                            4 mb. animation Cry

                            Nightsky2009-04-18 22:17:07

                            #15228

                            johnni.gade
                              • Giant

                              Palle B. wrote: Har forsøgt at fange den lille nullermand siden 22:30 til 00:00 – uden held-

                              Confused

                              Ej det er sku surt haha 😀
                              #15232

                              tommyf
                              Deltager
                                • Neutron star

                                Fin anim, og godt taget…

                                #15251

                                thomas
                                  • Giant

                                  Hej Lars, den animation er squ godt lavet.

                                  Thumbs%20Up

                                  Jeg har flere gange forsøgt at fange den visuelt, men det er ikke lykkes……endnu

                                  Thomas2009-04-19 19:03:49

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