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  1. #1
    canopus56's Avatar
    canopus56 Guest

    Default Obs Notes: Visibility of Venus and Mercury Conjunction 8-17 to 8-23



    On 8/17 through 8/23 at sunset, Venus (-3.9) and Mercury (-1.1) will
    be visible within a 1.2 deg eyepiece view. Venus and Mercury will be
    at approx. 275 az alt 8 at 8:20pm MDT each night. Venus becomes naked
    eye visible at around 8:35pm, allowing for easy target acquistion.

    On 8/16/2008 2:20UT (8:20 MDT), I watched Venus and Mercury (Saturn
    was not visible) with 10x50 binos and a smaller 70mm refractor for the
    purpose of getting a feel for the visibility of this wide
    conjunction. The following are my notes on visibility as Venus set
    between 8:20pm MDT and 9:00pm MDT:

    8:20 MDT - Venus visible telescopically at approx. 7 degs alt; 275 az.
    Venus phase easily seen in refractor at low power. Sky Quality Meter
    ZLM 8.7 MPSAS (-5.5 mags). (The sky was much brighter near the
    horizon.) Unable to detect Saturn or Mercury.

    8:35 MDT - Venus visible the naked eye. Sky Quality Meter ZLM 9.5
    MPSAS (-4.2 mags). Mercury not detectable visually or
    telescopically.

    8:56 MDT - Mercury first detected telescopically about 1.5 degs from
    Venus - but only 2 degs above the horizon. Mercury was only visible
    for a couple a minutes before being obstructed by a horizon object.
    Sky Quality Meter ZLM 13.1 MPSAS (-0.6 mags). Zero magnitude stars
    just coming out within 25 degs zenithal distance.

    ~9:05 MDT - Venus sets. Saturn (1.1) was not detectable at any
    time.

    For this evening (8/17 to 8-23), Mercury should be much easier to
    detect telescopically in the same AFOV as Venus, earlier in twilight
    and at a higher initial altitude.

    - Canopus56

  2. #2
    AstroSketcher@gmail.com's Avatar
    AstroSketcher@gmail.com Guest

    Default Obs Notes: Visibility of Venus and Mercury Conjunction 8-17 to8-23

    On Aug 17, 5:37 pm, canopus56 <canopu...@yahoo.com> wrote:


    Thanks for the notice! I spotted the two planets shortly after sunset
    this evening with 20x80 binoculars. A little later they were seen
    with 8x42 binoculars. The binoculars were necessary for me to see
    Mercury in the bright twilight through thin, brightly illuminated,
    orange clouds. When Mercury was centered in the 3 degree field of the
    20x80s Venus was just within the same binocular field to the upper
    left.

    Bill Greer
    To sketch is to see.

  3. #3
    canopus56's Avatar
    canopus56 Guest

    Default Obs Notes: Visibility of Venus and Mercury Conjunction 8-17 to8-23

    On Aug 17, 8:46 pm, AstroSketc...@gmail.com wrote:

    Glad you enjoyed it. Watched Venus and Mercury on night of 8-17.
    Mercury not visible to naked-eye or in 10x50 binos. Mercury was
    visible about 1.1 degs from Venus in small refractor at 25x beginning
    at 8:44pm MDT, or about 22 minutes after local sunset against an
    orange-yellow twilight sky. ZLM 12.7 MPSAS (-1v). At sunset tonight
    Mercury should be closer to Venus. - Canopus56

 

 

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