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CentaurZ

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About CentaurZ

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    Nebula

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    https://www.CurtRenz.com/astronomy.html

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    Male
  • Location
    Chicagoland
  1. CentaurZ

    Lunar X - 2018 AUG 18

    The Lunar X may be seen by telescopic observers in Europe and the Americas during Saturday 2018 AUG 18 for an approximately four-hour period centered on 14:52 CDT (19:52 UT). This will be an evening event in Europe and an afternoon event in the Americas. The X should appear as the Sun rises on the clustered rims of the craters Blanchinus, La Caille and Purbach, while a waxing Half Moon graces the sky. This is something to check-off from your astronomical “to-do” list. Photos and descriptions of the Lunar X would be welcome additions to this thread.
  2. The shadows of Jupiter’s Galilean satellites #1 Io and #2 Europa will appear in simultaneous transit across Jupiter during the afternoon and evening of Thursday 2018 AUG 16 for North American observers. Photos and descriptions of the event would be welcome additions to this thread.
  3. Elusive Mercury has commenced its apparition in the predawn eastern sky following its inferior conjunction between Earth and Sun on 2018 AUG 08. Photos and descriptions of Mercury during this apparition would be welcome additions to this thread.
  4. It’s nearly time for my monthly New Moon spotting challenge. Sharp-eyed North Americans with clear skies might attempt to spot the less than one-day-old Moon after sunset on Saturday, August 11, although success is rather unlikely. Most others should have much better luck during the following evening. Photos and descriptions of the young crescent Moon this month would be welcome additions to this thread. Below is a photo that I shot from Arlington Heights, Illinois of the Moon on 2011 Aug 31 at 19:55 CDT while it was aged 2.9 days.
  5. CentaurZ

    Sun and Moon anomaly

    The straightest line "actually great circle on the celestial sphere" is not the one you are imagining along the horizon. In your 2-D photo the actual shortest angular distance along the celestial sphere might "appear" to be a curved line peaking near the center of the photo. When viewing live in 3-D, the direct line connecting the Sun and Moon is more obviously one that peaks around their mid-point. Indeed, it presents an optical illusion for those who expect the line representing the shortest angular distance between the Sun and Moon on the celestial sphere to loop around the horizon.
  6. The annual Perseid Meteor Shower is already underway. The Perseids are debris from the periodic comet 109P Swift-Tuttle. The shower is expected to peak during the night of 2018 AUG 12-13. Its radiant is in the constellation Perseus. That is the direction toward which the meteor tails point, but the meteors are equally likely to appear anywhere along your horizon. The region near your zenith will likely present the fewest but brightest meteors. The Perseids are usually the finest shower of the year. Normally at the peak up to sixty meteors per hour may be seen by some sharp eyed folks. For observers north of the tropics, the meteors appear virtually all night, although most prolifically during the hours before dawn. The waxing crescent Moon near the shower’s peak will set during the early evening and should not be a source of interference. Descriptions of the shower or perhaps even lucky photos would be welcome additions to this thread.
  7. The waxing gibbous Moon will occult (cover) the magnitude +3.8 star Omicron Sagittarii for observers in Canada and northern USA during the night of 2018 JUL 25-26. The current series of 19 monthly Omicron Sagittarii occultations extends from 2018 JUN 01 to 2019 OCT 05. However the large majority are not visible at nighttime from any particular location. The next series will commence on 2028 OCT 23. The upcoming immersion will occur on the lunar dark limb and emersion on the bright limb. Observers on the only graze path will witness the star winking on and off as lunar hills and valleys pass by. That includes the vicinities of Salt Lake City, New York City and Boston. Those north of the path will see a full occultation. Photos and descriptions of the occultation would be welcome additions to this thread. If you would like specific occultation or graze predictions for your location, please reply to this post with your longitude, latitude, elevation and time zone.
  8. Mars will appear at a perihelic opposition from the Sun during the night of 2018 JUL 26-27. Greatest brilliance at magnitude -2.8 is expected on JUL 28, with closest approach to Earth on JUL 31. It will be nearly as bright and close as in 2003, which was its closest in more than 60,000 years. Photos and descriptions of Mars during its current apparition would be welcome additions to this thread.
  9. CentaurZ

    July New Moon Spotting

    Here's how the young Moon will appear in the western sky this evening from Chicagoland at 20 minutes after sunset.
  10. CentaurZ

    July New Moon Spotting

    It’s nearly time for my monthly New Moon spotting challenge. Sharp-eyed North Americans with clear skies might be able to spot the one-day-old Moon after sunset on Friday, July 13. It will be seen well to the lower right of Mercury and Venus. Others, especially those further east, should have better luck during the following evening. Photos and descriptions of the young crescent Moon this month would be welcome additions to this thread. Below is a photo that I shot from Arlington Heights, Illinois of the Moon 2007 JUL 15 at 21:10 CDT while the Moon was aged 1.6 days.
  11. A brightness outburst has been reported for Comet C/2017 S3 Pan-STARRS that may lead to its disintegration. http://www.dailymail.co.uk/sciencetech/article-5922963/The-incredible-hulk-comet.html The magnitude given in the chart below does not take the outburst into account. Photos and descriptions of the comet would be welcome additions to this thread.
  12. Below is a preview of nine phases of the eclipse as projected against an imaginary blue wall. The posted timings are in BST (UT+1). The events will occur at essentially the same times for all locations after adjustments for time zones. The Moon altitudes are for London. The eclipse will not be visible from North America. Photos and descriptions of the eclipse would be welcome additions to this thread.
  13. CentaurZ

    Tour of Yerkes Observatory

    Chicago Tribune today regarding attempt to preserve Yerkes Observatory: http://www.chicagotribune.com/news/ct-met-yerkes-observatory-sale-20180627-story.html#nws=true Read mo
  14. CentaurZ

    Total lunar eclipse 27th of July

    Below is a preview of nine phases of the eclipse as projected against an imaginary blue wall. The posted timings are in BST (UT+1). The events will occur at essentially the same times for all locations after adjustments for time zones. The Moon altitudes are for London. The eclipse will not be visible from North America.
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