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  1. #1
    Abdul Ahad's Avatar
    Abdul Ahad Guest

    Default Anyone measuring 70 Ophiuchi?



    Hi,

    I started tracking this nearby binary system back in summer 2004, and
    was intending to repeat my observations every other year in the hope of
    seeing some movement in my *limited* 8" Newt. I'd totally forgotten
    that I managed to do an article on it back then:

    http://www.astroscience.org/abdul-ahad/astrometry.htm

    Can't wait for summer to roll in so I could repeat the exercise and see
    if anything's changed :-)

    Is anyone here already on the ball with this?

    cheers,
    AA
    http://www.publishedauthors.net/aa_spaceagent/


  2. #2
    skidily-dobop-dabay's Avatar
    skidily-dobop-dabay Guest

    Default Anyone measuring 70 Ophiuchi?


    "Abdul Ahad" <abdul.ahad@ntlworld.com> wrote in message
    news:1144484494.273214.317910@i40g2000cwc.googlegr oups.com...


    Good luck with ofuckee



  3. #3
    Paul Schlyter's Avatar
    Paul Schlyter Guest

    Default Anyone measuring 70 Ophiuchi?

    In article <1144484494.273214.317910@i40g2000cwc.googlegroups .com>,
    Abdul Ahad <abdul.ahad@ntlworld.com> wrote:


    It would have been easier to do this sone 20 years ago. when 70 Oph passed
    through periastron.

    In the 1980's I made some drawings of 70 Oph using a 4-inch refractor.
    After only a few years the motion was easily seen visually - 70 Oph had
    then moved through some 90 degrees in PA.

    Now its movement is much slower.

    --
    ----------------------------------------------------------------
    Paul Schlyter, Grev Turegatan 40, SE-114 38 Stockholm, SWEDEN
    e-mail: pausch at stockholm dot bostream dot se
    WWW: http://stjarnhimlen.se/

  4. #4
    Abdul Ahad's Avatar
    Abdul Ahad Guest

    Default Anyone measuring 70 Ophiuchi?

    Paul Schlyter wrote:


    True. Though having a telescope back in the 1980s that could resolve 70
    Oph was something of a "dream" for me...

    I would be content seeing just some movement either in separation or
    PA, though the latter will now be tiny. The pair look set to continue
    to widen through 2020 when apastron will be reached, with a whopping
    max. separation of some 7.5 arc-secs.

    The other component I'm tracking with this star is its proper motion.
    With a near one full arc-second per year, it should become obvious in
    just a few years.

    AA
    http://www.publishedauthors.net/aa_spaceagent/


  5. #5
    Paul Schlyter's Avatar
    Paul Schlyter Guest

    Default Anyone measuring 70 Ophiuchi?

    In article <1144608409.727016.165170@t31g2000cwb.googlegroups .com>,
    Abdul Ahad <abdul.ahad@ntlworld.com> wrote:


    You could also try some other double stars as well. The doulbe star must
    have a separation wide enough to be split in your scope of course, and it
    must have a period short enough for the motion to be detectable within a
    few years. This combined means the star must be a nearby star.

    The best candidate is Alfa Centauri, but perhaps you don't live far enough
    south to be able to see it. Other candidates would be Sirius and Procyon,
    but the large brightness difference between the components in these doubles
    makes it extremely hard to see the secondary.

    Other candidates could be Xi Ursae Majors and Gamma Virginis. The latter
    is very near perihelion right now, and the separation is so small that
    you'll see it as a single star. But do observe it every year during the
    next decade, and see that "single" star split in two!

    --
    ----------------------------------------------------------------
    Paul Schlyter, Grev Turegatan 40, SE-114 38 Stockholm, SWEDEN
    e-mail: pausch at stockholm dot bostream dot se
    WWW: http://stjarnhimlen.se/

  6. #6
    Abdul Ahad's Avatar
    Abdul Ahad Guest

    Default Anyone measuring 70 Ophiuchi?

    Paul Schlyter wrote:


    I wish! Perfect candidate for my amateur scope. [It's the target system
    in my new sci-fi novel 'First Ark to Alpha Centauri' :-) ]


    Yeah, Gamma Virginis is another pair I'm keen on following. I checked
    the ephemeris predictions from the US Naval Observatory's sixth orbit
    catalog:

    http://ad.usno.navy.mil/wds/orb6/orb6ephem.html

    The PA (degrees) and separations (arc-secs) are going to be as
    follows:-

    2005: 168.1, 0.381
    2006: 85.8, 0.439
    2007: 50.5, 0.726
    2008: 35.2, 0.997
    2009: 26.2, 1.238

    Luckily for me, the two stars are of near-equal brightnesses so I think
    in the next couple of years I'll start to see Gamma Vir as a 'double'
    for the first time...

    AA
    http://www.publishedauthors.net/aa_spaceagent/


 

 

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