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Venus at greatest brightness

Dominic Ford, Editor
From the Inner Planets feed

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The sky at

Venus will reach its greatest brightness in its 2018 evening apparition. It will be shining brightly at mag -4.6.

From Ashburn , this apparition will not be one of the most prominent but prominent, reaching a peak altitude of 28° above the horizon at sunset on 7 Jun 2018.

Begin typing the name of a town near to you, and then select the town from the list of options which appear below.

The table below lists how high Venus will appear at sunset over the course of the apparition. All times are given in Ashburn local time.

Date Sun
sets at
Venus
sets at
Altitude
at sunset
Direction
at sunset
09 Mar 201818:1019:1813°west
19 Mar 201819:2020:4115°west
29 Mar 201819:3021:0418°west
08 Apr 201819:4021:2720°west
18 Apr 201819:4921:5022°west
28 Apr 201819:5922:1324°west
08 May 201820:0922:3526°west
18 May 201820:1822:5227°west
28 May 201820:2623:0528°west
07 Jun 201820:3323:1128°west
17 Jun 201820:3723:1228°west
27 Jun 201820:3923:0728°west
07 Jul 201820:3822:5726°west
17 Jul 201820:3322:4424°west
27 Jul 201820:2622:2823°west
06 Aug 201820:1622:0921°west
16 Aug 201820:0321:4919°south-west
26 Aug 201819:4921:2717°south-west

A graph of the brightness of Venus is available here.

Observing Venus

The 2018 evening apparition of Venus
07 Jun 2018 – Venus reaches highest point in evening sky
15 Aug 2018 – Venus at dichotomy
17 Aug 2018 – Venus at greatest elongation east
25 Sep 2018 – Venus at greatest brightness

Venus's orbit lies closer to the Sun than the Earth's, meaning that it always appears close to the Sun and is lost in the Sun's glare much of the time.

It is observable for a few months each time it reaches greatest separation from the Sun – moments referred to as greatest elongation. These apparitions repeat roughly once every 1.6 years.

On these occasions, Venus is so bright and conspicuous that it becomes the third brightest object in the sky after the Sun and Moon. It is often called the morning star or the evening star.

Venus's brightness

Venus's brightness depends on two factors: its closeness to the Earth, and its phase. Its phase varies depending on its position relative to the Earth. When it passes between the Earth and Sun, for example, the side that is turned towards the Earth is entirely unilluminated, like a new moon.

Conversely, when it lies opposite to the Earth in its orbit, passing almost behind the Sun, it appears fully illuminated, like a full moon. However, at this time it is also at its most distant from the Earth, so it is actually fainter than at other times.

Venus reaches its brightest when it is still a crescent – with less than half of its disk illuminated. This is because it is much closer to the Earth during its crescent phases than at other times.

As a result, during evening apparitions, Venus reaches maximum brightness a few days after it is at greatest separation from the Sun, which always coincides with it showing half-phase (dichotomy).

Conversely, during morning apparitions, Venus reaches maximum brightness a few days before it is at greatest separation from the Sun.

Venus's position

The coordinates of Venus when it reaches its greatest brightness will be:

Object Right Ascension Declination Constellation Angular Size
Venus 14h16m10s -20°13' Virgo 42.0"
Sun 12h06m -00°43' Virgo 31'53"

The coordinates above are given in J2000.0.

The sky on 25 September 2018
Sunrise
07:00
Sunset
19:03
Twilight ends
20:32
Twilight begins
05:31

16-day old moon
Waning Gibbous

99%

16 days old

Planets
Rise Culm. Set
Mercury 07:18 13:17 19:16
Venus 10:16 15:09 20:03
Moon 19:50 01:12 07:05
Mars 16:39 21:20 02:04
Jupiter 11:02 16:07 21:12
Saturn 14:19 19:03 23:47
All times shown in EDT.

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

25 Sep 2018  –  Venus at greatest brightness
26 Oct 2018  –  Venus at inferior solar conjunction
29 Nov 2018  –  Venus at greatest brightness
14 Dec 2018  –  Venus reaches highest point in morning sky

Image credit

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Ashburn

Latitude:
Longitude:
Timezone:

39.04°N
77.49°W
EST

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