579 days ago
Dominic Ford, Editor
From the Lunar Occultations feed
The Moon will pass in front of Mercury, creating a lunar occultation visible from Canada and the Contiguous United States.
The occultation will be visible from Ashburn. It will begin with the disappearance of Mercury behind the Moon at 15:47 EDT, though In daylight. Its reappearance will be visible at 16:41 EDT, though In daylight and at a low altitude of 9.0 degrees.
Extreme caution is necessary when pointing binoculars or telescopes at the sky when the Sun is above the horizon, as even a momentary glance at the Sun through such an instrument can cause permanent blindness.
The map below shows the visibility of the occultation across the world. Separate contours show where the disappearance of Mercury is visible (shown in red), and where its reappearance is visible (shown in blue). Solid contours show where each event is likely to be visible through binoculars at a reasonable altitude in the sky. Dotted contours indicate where each event occurs above the horizon, but may not be visible due to the sky being too bright or the Moon being very close to the horizon.
Outside of the contours, the Moon does not pass in front of Mercury at any time, or is below the horizon at the time of the occultation. However, a close conjunction between the pair may be visible.
The map can be downloaded in PNG , PDF or SVG format. A KMZ file , is also available, which can be opened in Google Earth to provide a higher resolution map.
A complete list of the countries and territories where the occultation will be visible is as follows:
|The Contiguous United States||02:31–08:19|
Lunar occultations are only ever visible from a small fraction of the Earth's surface. Since the Moon is much closer to the Earth than other celestial objects, its exact position in the sky differs depending on your exact location on Earth due to its large parallax. The position of the Moon as seen from two points on opposite sides of the Earth varies by up to two degrees, or four times the diameter of the full moon.
This means that if the Moon is aligned to pass in front of a particular object for an observer on one side of the Earth, it will appear up to two degrees away from that object on the other side of the Earth.
At the time of the occultation, the Moon will be 25 days past new moon and will be 2% illuminated. Mercury will disappear behind the illuminated side of the Moon and reappear from behind the unilluminated side of the Moon.
The position of Mercury at the moment of the occultation will be as follows:
|Object||Right Ascension||Declination||Constellation||Magnitude||Angular Size|
The coordinates above are given in J2000.0.
|« Previous||Next »|
|Visible from the Contiguous United States||Worldwide||Worldwide||Visible from the Contiguous United States|
|19 Jul 2001||18 Sep 2017||Occultations of Mercury||01 Mar 2025||18 Feb 2026|
|19 Aug 2021||12 Oct 2021||Occultations||08 Nov 2021||19 Apr 2022|
The sky on 03 Nov 2021
|The sky on 03 November 2021|
28 days old
All times shown in EDT.
The circumstances of this event were computed using the DE430 planetary ephemeris published by the Jet Propulsion Laboratory (JPL).
This event was automatically generated by searching the ephemeris for planetary alignments which are of interest to amateur astronomers, and the text above was generated based on an estimate of your location.
|24 Oct 2021||– Mercury at greatest elongation west|
|07 Jan 2022||– Mercury at greatest elongation east|
|09 Jan 2022||– Mercury at highest altitude in evening sky|
|09 Feb 2022||– Mercury at highest altitude in morning sky|
The Moon in conjunction with Venus and Jupiter, with the Very Large Telescope in the foreground. Image © Y. Beletsky, ESO, 2009.