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CentaurZ

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About CentaurZ

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    Star Forming

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

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    Chicagoland
  1. And here's my array graphic for the Galilean satellites tonight.
  2. Here's my timetable for tonight's Galilean satellite events.
  3. The shadows of the Galilean satellites #1 Io and #2 Europa will be simultaneously transiting Jupiter on Sunday 2019 OCT 13. Io itself will also be transiting. This will be an evening event for the eastern half of North America and afternoon out west. Photos and descriptions of the transits would be welcome additions to this thread.
  4. It’s nearly time for my monthly New Moon spotting challenge. I use the term New Moon in its classical sense of one’s first sighting of the Moon after its monthly solar conjunction (Dark Moon). Sharp-eyed observers may attempt to spot the one-day-old Moon after sunset on September 29th. Photos and descriptions of the young crescent Moon late this month would be welcome additions to this thread.
  5. The 2019 Harvest Moon will be in the sky throughout the night of September 13-14. This is the annual Full Moon that traditionally occurs nearest to the time of the Autumnal Equinox, which this year will be reached early on September 23. The Harvest Moon provides extra lighting that allows farmers additional time to harvest crops after sunset. It is particularly beneficial for several evenings around the date of Full Moon at this time of year, since north of the tropics the separation between daily rising times is significantly less than the average of 24 hours and 50 minutes. So farmers can take advantage of a bright Moon for several successive evenings. Unfortunately, this year the Harvest Moon will occur near Apogee when it is furthest from the Earth, and its apparent angular diameter is narrowest. However, the swings are not that large, and most people do not sense the different apparent sizes among Full Moons. Of greater importance, on average a Full Moon is 12 times brighter than a Half Moon (Dichotomy – near Quadrature-Quarter cusp). This is due to lack of visible shadowing from mountains, craters, rocks and particles at the time of Full Moon, when the Sun is in the opposite direction. Photos and descriptions of the Harvest Moon would be welcome additions to my similar thread in the Observing-Lunar forum.
  6. The 2019 Harvest Moon will be in the sky throughout the night of September 13-14. This is the annual Full Moon that traditionally occurs nearest to the time of the Autumnal Equinox, which this year will be reached early on September 23. The Harvest Moon provides extra lighting that allows farmers additional time to harvest crops after sunset. It is particularly beneficial for several evenings around the date of Full Moon at this time of year, since north of the tropics the separation between daily rising times is significantly less than the average of 24 hours and 50 minutes. So farmers can take advantage of a bright Moon for several successive evenings. Unfortunately, this year the Harvest Moon will occur near Apogee when it is furthest from the Earth, and its apparent angular diameter is narrowest. However, the swings are not that large, and most people do not sense the different apparent sizes among Full Moons. Of greater importance, on average a Full Moon is 12 times brighter than a Half Moon (Dichotomy – near Quadrature-Quarter cusp). This is due to lack of visible shadowing from mountains, craters, rocks and particles at the time of Full Moon, when the Sun is in the opposite direction. Photos and descriptions of the Harvest Moon would be welcome additions to this thread.
  7. The farthest major planet Neptune will appear in opposition to the Sun during the night of 2019 SEP 09-10, while in the constellation Aquarius at magnitude +7.8. Photos and descriptions of Neptune would be welcome additions to this thread.
  8. Actually, Stu, I posted it in the "Celestial Events Heads Up" forum a few minutes before posting it here.
  9. Mercury will appear to transit the disk of the Sun on 2019 NOV 11 for observers in the Americas, Europe, Africa, Near East and New Zealand. This will be the last Mercury transit until 2032, and until 2049 for North Americans. As with a Solar Eclipse, great care must be taken to protect eyes. If not accompanied by an expert in solar viewing, it may be wise to simply watch online live videos of the transit. My graphic is for a fictional geocentric observer with X-ray vision. The timings are in Universal Time (UT) and will differ slightly by various amounts for topocentric observers. Photos and descriptions of the transit would be welcome additions to this thread.
  10. Mercury will appear to transit the disk of the Sun on 2019 NOV 11 for observers in the Americas, Europe, Africa, Near East and New Zealand. This will be the last Mercury transit until 2032, and until 2049 for North Americans. As with a Solar Eclipse, great care must be taken to protect eyes. If not accompanied by an expert in solar viewing, it may be wise to simply watch online live videos of the transit. My graphic is for a fictional geocentric observer with X-ray vision. The timings are in Universal Time (UT) and will differ slightly by various amounts for topocentric observers. Photos and descriptions of the transit would be welcome additions to my similar thread in the forum for Observing-Planetary.
  11. It’s nearly time for my monthly New Moon spotting challenge. I use the term New Moon in its classical sense of one’s first sighting of the Moon after its monthly solar conjunction (Dark Moon). Attempts to spot the less than one-day-old Moon after sunset on August 30th may prove fruitless for observers north of the tropics, considering the time of the year. Better luck may be had the following evening. Photos and descriptions of the young crescent Moon late this month would be welcome additions to this thread.
  12. The waning crescent Moon will occult (cover) stars in the Beehive (Praesepe – M44) Cluster for observers in portions of North America including Chicagoland during the predawn hours of Wednesday 2019 AUG 28. Epsilon Cancri is the brightest Beehive star at magnitude +6.3, which is barely in the range for naked eyes. The entire cluster of over a thousand stars appears as a nebulous object to naked eyes in dark skies. Of course, it is better seen with binoculars or a telescope. The current series of 25 monthly Beehive occultations extends from 2018 MAY 20 to 2019 NOV 2019. However, the large majority are not visible at nighttime from any particular location. The next series will commence on 2026 JAN 05. The upcoming immersions will occur on the lunar bright limb and emersions on the dark limb. Any observers on a graze path can witness a star winking on and off as lunar hills and valleys pass by. Those between the two paths will see a full occultation. Photos and descriptions of the occultations 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.
  13. The waxing gibbous Moon will occult (cover) Saturn for observers in eastern Australia and northern New Zealand during the evening of Monday 2019 AUG 12. The current series of 14 monthly Saturn occultations extends from 2018 DEC 09 to 2019 NOV 29. However, the large majority are not visible at nighttime from any particular location. The next series will commence on 2024 APR 06 The upcoming immersion will occur on the lunar dark limb and emersion on the bright limb. Any observers on a graze path can witness the star winking on and off as lunar hills and valleys pass by. Those between the two paths 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.
  14. The waxing gibbous Moon will occult (cover) Saturn for observers in eastern Australia and northern New Zealand during the evening of Monday 2019 AUG 12. The current series of 14 monthly Saturn occultations extends from 2018 DEC 09 to 2019 NOV 29. However, the large majority are not visible at nighttime from any particular location. The next series will commence on 2024 APR 06 The upcoming immersion will occur on the lunar dark limb and emersion on the bright limb. Any observers on a graze path can witness the star winking on and off as lunar hills and valleys pass by. Those between the two paths will see a full occultation. Photos and descriptions of the occultation would be welcome additions to my similar post in the Observing-Lunar forum. If you would like specific occultation or graze predictions for your location, please reply to my similar post in the Observing-Lunar forum with your longitude, latitude, elevation and time zone.
  15. The annual Perseid Meteor Shower is already underway. The Perseids are usually the finest shower of the year. Normally at the peak more than sixty meteors per hour may be seen by some sharp-eyed folks. The Perseids are debris from the periodic comet 109P Swift-Tuttle. The shower is expected to peak during the night of 2019 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 in your sky. For observers north of the tropics, the meteors appear virtually all night, although most prolifically during the hours before dawn. This year the waxing gibbous Moon near the shower’s peak may provide some interference until it sets during the predawn hours. Descriptions of the shower or perhaps even lucky photos would be welcome additions to this thread.
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