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  1. #1
    Starboard's Avatar
    Starboard Guest

    Default RS Ophiuchi in Naked-Eye Outburst! (Cool!)



    http://skyandtelescope.com/printable...ticle_1681.asp


    For first time in 21 years, the famous recurrent nova RS Ophiuchi has
    erupted into naked-eye visibility. As late as February 10, 2006, the
    star was still magnitude 11.0, where it spends most of its time with
    only minor fluctuations. But on the morning of February 13th it was
    reported shining at magnitude 4.8. The outburst was discovered at
    February 12.8 Universal Time by Kiyotaka Kanai and Hiroaki Narumi in
    Japan, who estimated it to be magnitude 4.5 at the time.
    RS Oph is located in eastern Ophiuchus near Serpens Cauda. This part of
    the sky is moderately well up in the southeast just before the first
    light of dawn. (You can find the time when dawn begins at your site by
    checking that your location and time zone are correct in our online
    almanac. If you're not on daylight saving time, which is certainly the
    case this month throughout the Northern Hemisphere, make sure that the
    Daylight Saving Time box is unchecked.)

    The star lies at right ascension 17h 50.2m, declination -6░ 43'
    (equinox 2000.0).

    Shining at 5th magnitude on the morning of February 13th, the recurrent
    nova RS Ophiuchi posed for Ernesto Guido and Giovanni Sostero in Italy
    as they took its picture with a remotely controlled telescope half a
    world away at the RAS Observatory of New Mexico. Click on the image for
    a 1░-wide version. North is up and east is left.

    RS Ophiuchi, like other cataclysmic variable stars, is a close binary.
    A red giant of spectral type M2 is spilling gas onto a small, dense,
    blue companion star. The hot blue star erupted in 1898, 1933, 1958,
    1967, and 1985, and it may also have had an outburst in 1945. According
    to alerts issued on February 13th by the American Association of
    Variable Star Observers (AAVSO), RS Ophiuchi last peaked in January
    1985 at magnitude 5.2, then declined at an average rate of 0.1
    magnitude per day for the next 38 days. It took about a year and a half
    to fade all the way back to normal.

    A 16░-wide comparison-star chart is available from the AAVSO, which
    also offers a history of RS Oph and its outbursts.

    Both amateur and professional astronomers have been anticipating this
    event for years. See our article "When Will RS Ophiuchi Next Blow Its
    Stack?"

    Update February 14: Reports from last night sent to the AAVSO indicate
    that RS Oph has faded by about 0.7 magnitude in the last day, to about
    magnitude 5.5. The star's low altitude and the full moonlight may or
    may not be compromising visual estimates and other measurements. Check
    back here for further developments.


  2. #2
    Tom Polakis's Avatar
    Tom Polakis Guest

    Default RS Ophiuchi in Naked-Eye Outburst! (Cool!)

    Starboard wrote:




    Today's estimates on the AAVSO site have it as faint as magnitude 6.0.
    I took a look at the yellow-white recurrent nova this morning through
    my Pronto. Using the sophisticated astroimaging setup of a 20mm lens
    on a Canon 20D on a tripod, and exposing on ISO400 for 5 seconds at
    f/2.5, I got this image of RS Oph. You will want to hunch over your
    desk, and get your eyes a few inches from your monitor to see it.

    http://members.cox.net/tpolakis/astro/RSOph2.jpg

    Tom


  3. #3
    G's Avatar
    G Guest

    Default RS Ophiuchi in Naked-Eye Outburst! (Cool!)

    A telephone wire?



  4. #4
    Joe S.'s Avatar
    Joe S. Guest

    Default RS Ophiuchi in Naked-Eye Outburst! (Cool!)


    "Tom Polakis" <polakisgroups@cox.net> wrote in message
    news:1140020590.199015.318250@g43g2000cwa.googlegr oups.com...

    I SEE IT!!! I SEE IT!!!!



  5. #5
    Joe Bergeron's Avatar
    Joe Bergeron Guest

    Default RS Ophiuchi in Naked-Eye Outburst! (Cool!)

    In article <1140020590.199015.318250@g43g2000cwa.googlegroups .com>, Tom
    Polakis <polakisgroups@cox.net> wrote:

    When did you get the SVP mount, Tom? Got your Pronto on it?

    --
    Joe Bergeron

    http://www.joebergeron.com

  6. #6
    Joe Bergeron's Avatar
    Joe Bergeron Guest

    Default RS Ophiuchi in Naked-Eye Outburst! (Cool!)

    In article <1140104570.541359.91820@o13g2000cwo.googlegroups. com>, Tom
    Polakis <polakisgroups@cox.net> wrote:


    Yeah. I'll transmit your suggestion to that loser.

    It's a good idea to have at least one actual driven German mount at
    your house just to keep all those Dobs from getting too complacent.

    --
    Joe Bergeron

    http://www.joebergeron.com

 

 

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