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

Lunar occultation of Aldebaran

Dominic Ford, Editor
From the Lunar Occultations feed

Objects: Aldebaran
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The Moon will pass in front of Aldebaran (Alpha Tauri), creating a lunar occultation visible from countries and territories including western Canada, Alaska, the western Contiguous United States and eastern Russia 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.

The occultation will be visible from Ashburn. It will begin with the disappearance of Aldebaran (Alpha Tauri) behind the Moon at 10:02 EDT, though in daylight. Its reappearance will be visible at 11:00 EDT, though in daylight.

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 Aldebaran (Alpha Tauri) 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 Aldebaran (Alpha Tauri) 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.

The animation below shows the path of the occultation across the Earth's globe. The red circle shows where the Moon appears in front of Aldebaran (Alpha Tauri).

You can download this video in MP4 or OGG format.

A complete list of the countries and territories where the occultation will be visible is as follows:

Country Time span
(UTC)
Canada 12:47–14:33
Alaska 12:00–14:03
The Contiguous United States 13:00–14:36
Russia 11:46–13:00
Japan 11:38–12:21
Federated States of Micronesia 11:19–11:37
Midway Atoll 11:29–12:21
Marshall Islands 11:20–11:43
Midway Islands 11:25–12:25
Wake Island 11:13–11:59

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 6 days past new moon and will be 74% illuminated. Aldebaran (Alpha Tauri) will disappear behind the illuminated side of the Moon and reappear from behind the unilluminated side of the Moon.

The position of Aldebaran (Alpha Tauri) at the moment of the occultation will be as follows:

Object Right Ascension Declination Constellation Magnitude Angular Size
Aldebaran (Alpha Tauri) 04h35m50s 16°30'N Taurus 1.0 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
05 Sep 2015 05 Sep 2015 Occultations of Aldebaran (Alpha Tauri) 29 Oct 2015 26 Nov 2015
05 Sep 2015 29 Sep 2015 Occultations 08 Oct 2015 26 Nov 2015

The sky on 25 Feb 2024

The sky on 25 February 2024
Sunrise
06:47
Sunset
17:57
Twilight ends
19:26
Twilight begins
05:17

16-day old moon
Waning Gibbous

97%

16 days old

Planets
Rise Culm. Set
Mercury 06:52 12:16 17:39
Venus 05:41 10:43 15:45
Moon 18:09 00:55 07:30
Mars 05:39 10:37 15:36
Jupiter 09:31 16:21 23:11
Saturn 07:03 12:34 18:05
All times shown in EST.

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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Ashburn

Latitude:
Longitude:
Timezone:

39.04°N
77.49°W
EST

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