2,377 days ago
Dominic Ford, Editor
From the Lunar Occultations feed
The Moon will pass in front of Neptune, creating a lunar occultation visible from countries and territories including eastern Canada, Greenland, the eastern Contiguous United States and the Portuguese Azores amongst others.
The occultation will be visible from Fairfield. It will begin with the disappearance of Neptune behind the Moon at 16:10 EST, though In daylight. Its reappearance will be visible at 17:32 EST, though In twilight.
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 Neptune 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 Neptune 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||02:31–14:24|
|The Portuguese Azores||18:43–00:51|
|Saint Pierre and Miquelon||18:53–00:53|
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 45% illuminated. Neptune will disappear behind the unilluminated side of the Moon and reappear from behind the illuminated side of the Moon.
The position of Neptune 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|
|23 Jul 2016||09 Nov 2016||Occultations of Neptune||03 Jan 2017||18 Sep 2024|
|19 Oct 2016||15 Nov 2016||Occultations||13 Dec 2016||13 Dec 2016|
The sky on 06 Dec 2016
|The sky on 06 December 2016|
7 days old
All times shown in EST.
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.
|02 Sep 2016||– Neptune at opposition|
|05 Sep 2017||– Neptune at opposition|
|07 Sep 2018||– Neptune at opposition|
|10 Sep 2019||– Neptune at opposition|
The Moon in conjunction with Venus and Jupiter, with the Very Large Telescope in the foreground. Image © Y. Beletsky, ESO, 2009.