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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
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    Chicagoland
  1. Several popular science blogs are referring to the Full Moon coming during the morning of 2019 FEB 19 as not only the widest (angular measurement) so-called Super Moon in the current series of three, but also as the brightest Moon of the year. Actually the Full Moon last month was the brightest Moon since 2001 and until 2096. That peak was reached just as it left the Earth’s penumbra following a Lunar Eclipse. I calculated this with use of a Jean Meeus algorithm. For brightness, not only must nearness to the Earth be considered, but also nearness to the Sun and nearness to the anti-solar point. Other sources apparently assume that only nearness to Earth is what matters for brightness. Here are some results of my calculations:
  2. CentaurZ

    Eclipses of Jupiter's moons

    In addition to the four Galilean satellites and their shadows transiting Jupiter, we can observe eclipses in the sense of Jupiter's shadow causing a satellite to fade from sight, or occultations when a satellite is hidden behind Jupiter. Also during rare periods the Galilean satellites can transit, occult and eclipse each other.
  3. CentaurZ

    Lunar X - 2019 FEB 11

    Glad you found it, Vacuum. Enjoyed your side story.
  4. CentaurZ

    Mercury as Winter Evening Star

    You're welcome. Yes, downloading would be quite OK.
  5. Elusive Mercury has commenced its apparition in the early evening western sky following its superior conjunction behind the Sun on 2019 JAN 29. Photos and descriptions of Mercury during this apparition would be welcome additions to this thread.
  6. CentaurZ

    Lunar X - 2019 FEB 11

    The Lunar X may be seen by telescopic observers in North America during the evening of Monday 2019 FEB 11 for an approximately four-hour period centered on 22:00 CST (FEB 12 - 04:00 UT). The X should appear as the Sun rises on the clustered rims of the craters Blanchinus, La Caille and Purbach, while a waxing nearly 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.
  7. 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 conjunction with the Sun (Dark Moon). Some sharp-eyed North Americans might want to attempt spotting the one-day-old Moon after sunset on Tuesday, February 5. Other observers 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.
  8. My career was in TV news, nevertheless I have always been rather well informed on scientific matters. However, I am reminded of an older colleague who observed a crescent Moon one morning for which its dark portion was dimly light by earthshine. He asked me if this was due to the Moon being eclipsed. I do give credit to Alistair MacLean who wrote the screenplay for Where Eagles Dare in which Richard Burton said, "And the chap they've got knows no more about the second front than I know about the back end of the Moon." No mention of the "dark" side.
  9. Not a great hour for you, but at least it won't be around 0°F like here in Chicagoland. I've heard that banging drums may keep the clouds away.
  10. Nice rendering. I hope you actually get to see it.
  11. A Total Lunar Eclipse can be seen by those with clear skies in the Americas during the evening of Sunday 2019 JAN 20. Many in Europe should be able to witness totality during the predawn hours of Monday 2019 JAN 21. I’ve calculated that after the Moon leaves the penumbra it will be the brightest Moon since 2001 JAN 09-10 and until 2096 NOV 29-30. This is due to the confluence of the Moon being near Perigee, Perihelion and Ecliptic. Some in the media have been hyping this as a so-called SuperMoon for being near Perigee. But they have been overlooking the Perihelion and Ecliptic factors that will make this Full Moon especially bright when just outside of the Earth’s shadow. Below is a preview graphic I created for the eclipse as seen against an imaginary blue wall to make the shadow fully apparent. The predicted event timings are in CST (UT-6), but will occur at essentially the same real time for all observers experiencing nighttime. The depicted orientation and Moon altitudes are for an observer in Chicago. Photos and descriptions of the eclipse would be welcome additions to this thread.
  12. Comet C/2018 Y1 Iwamoto is expected to pass 0.3 AU from Earth on 2019 FEB 12 at a JPL estimated magnitude of +10.5. It is currently at magnitude 13.6 in the constellation Virgo. Photos and descriptions of the comet would be welcome additions to this thread.
  13. CentaurZ

    January New Moon Spotting

    You're welcome. Thank you for your fine report. I'm so glad that you, your daughter and new friends got to view the pretty sight of a less than two-day-old Moon.
  14. CentaurZ

    January New Moon Spotting

    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 conjunction with the Sun (Dark Moon). Some sharp-eyed North Americans might want to attempt spotting the one-day-old Moon after sunset on Sunday, January 6. Other observers 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.
  15. CentaurZ

    Total Lunar Eclipse 2019 Info

    The media appear to be missing an interesting point about this eclipse. I've calculated that when the Moon is just outside the penumbra (especially afterward) it will be the brightest Moon since 2001 and until 2096. Extreme brightness is not always the case for a so-called Supermoon, since besides the Earth-Moon distance, other factors to consider are the Sun-Moon distance and the Moon's nearness to the ecliptic.
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