The Moon in conjunction with Venus and Jupiter, with the Very Large Telescope in the foreground. Image © Y. Beletsky, ESO, 2009.

Lunar occultation of Regulus

Dominic Ford, Editor
From the Lunar Occultations feed

Objects: Regulus

The Moon will pass in front of Regulus (Alpha Leonis), creating a lunar occultation visible from countries and territories including Australia, New Zealand, eastern Indonesia and Papua New Guinea amongst others. Although the occultation will only be visible across part of the world – because the Moon is so close to the Earth that its position in the sky varies by as much as two degrees across the world – a close conjunction between the pair will be more widely visible.

Unfortunately the occultation will not be visible from Fairfield.

The map below shows the visibility of the occultation across the world. Separate contours show where the disappearance of Regulus (Alpha Leonis) 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.

Map showing where the occultation is visible

Outside the contours, the Moon will not pass in front of Regulus (Alpha Leonis) at any time, or is below the horizon at the time of the occultation. However, a close conjunction between the pair will be visible across much of the world.

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:

Country Time span
(UTC)
Australia 08:47–11:38
New Zealand 10:39–11:58
Indonesia 08:44–10:41
Papua New Guinea 09:40–10:46
Tasmania 10:12–11:25
New Caledonia 10:39–11:36
East Timor 08:46–10:17
Lord Howe Island 10:26–11:45
Macquarie Island 10:43–11:15
Norfolk Island 10:45–11:50

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.

The position of Regulus (Alpha Leonis) at the moment of the occultation will be as follows:

Object Right Ascension Declination Constellation Magnitude Angular Size
Regulus (Alpha Leonis) 10h08m20s 11°58'N Leo 1.4 0'00"

The coordinates above are given in J2000.0.

Next/previous occultations

« Previous Next »
Visible from the Contiguous United States Worldwide Worldwide Visible from the Contiguous United States
03 Nov 2007 07 Apr 2017 Occultations of Regulus (Alpha Leonis) 31 May 2017 15 Oct 2017
05 Mar 2017 28 Apr 2017 Occultations 20 May 2017 12 Sep 2017

The sky on 4 May 2017

The sky on 4 May 2017
Sunrise
05:44
Sunset
19:53
Twilight ends
21:41
Twilight begins
03:56

8-day old moon
Waxing Gibbous

68%

8 days old

Planets
Rise Culm. Set
Mercury 05:05 11:34 18:03
Venus 04:02 10:12 16:21
Moon 13:48 20:39 03:21
Mars 07:01 14:29 21:58
Jupiter 17:09 22:57 04:44
Saturn 23:09 03:50 08:30
All times shown in EDT.

Source

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.

Image credit

The Moon in conjunction with Venus and Jupiter, with the Very Large Telescope in the foreground. Image © Y. Beletsky, ESO, 2009.

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Fairfield

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41.14°N
73.26°W
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