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Mercury at inferior solar conjunction

Dominic Ford, Editor
From the Inner Planets feed

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The sky at

Mercury will pass very close to the Sun in the sky as its orbit carries it between the Sun and Earth.

This occurs once in every synodic cycle of the planet (116 days), and marks the end of Mercury's apparition in the evening sky and its transition to become a morning object over the next few weeks.

At closest approach, Mercury will appear at a separation of only 3°27' from the Sun, making it totally unobservable for several weeks while it is lost in the Sun's glare.

Mercury will also pass perigee – the time when it is closest to the Earth – at around the same time, since it will lie on exactly the same side of the Sun as the Earth in the Solar System. It will move to within a distance of 0.66 AU from the Earth, making it appear with its largest angular size. If it could be observed, it would measure 10.2 arcsec in diameter, whilst appearing completely unilluminated.

The exact position of Mercury at the moment it passes solar conjunction will be:

Object Right Ascension Declination Constellation Angular Size
Mercury 20h46m20s -14°22' Aquarius 10.2"
Sun 20h50m -17°42' Capricornus 32'28"

The coordinates above are given in J2000.0.

The sky on 30 January 2015
Sunrise
07:05
Sunset
17:05
Twilight ends
18:40
Twilight begins
05:30

10-day old moon
Waxing Gibbous

82%

10 days old

Planets
Rise Culm. Set
Mercury 06:48 12:00 17:11
Venus 08:17 13:39 19:00
Moon 13:49 21:00 03:19
Mars 08:38 14:17 19:55
Jupiter 17:34 00:41 07:43
Saturn 02:27 07:21 12:15
All times shown in EST.

Warning

Never attempt to point a pair of binoculars or a telescope at an object close to the Sun. Doing so may result in immediate and permanent blindness.

Source

The circumstances of this event were computed using the DE405 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.

Related news

17 Jan 2015  –  Mercury reaches highest point in evening sky
18 Feb 2015  –  Mercury reaches highest point in morning sky
24 Feb 2015  –  Mercury at greatest elongation west
07 May 2015  –  Mercury at greatest elongation east

Image credit

None available.

Fairfield

Latitude:
Longitude:
Timezone:

41.14°N
73.26°W
EST

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