© NASA/Ricardo Nunes

Venus at dichotomy

Dominic Ford, Editor
From the Inner Planets feed

Objects: Venus
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Venus will reach half phase in its 2083–2084 evening apparition. It will be shining brightly at mag -4.4.

From Ashburn , this apparition will be exceptionally well placed and prominent, reaching a peak altitude of 43° above the horizon at sunset on 15 Mar 2084.

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2083–2084 evening apparition of Venus

27 Jul 2083 – Venus at superior solar conjunction
05 Mar 2084 – Venus at greatest elongation east
08 Mar 2084 – Venus at dichotomy
15 Mar 2084 – Venus at highest altitude in evening sky
10 Apr 2084 – Venus at greatest brightness
15 May 2084 – Venus at inferior solar conjunction

A graph of the phase of Venus is available here.

Apparitions of Venus

14 May 2081 – Morning apparition
29 Jul 2082 – Evening apparition
17 Dec 2082 – Morning apparition
05 Mar 2084 – Evening apparition
25 Jul 2084 – Morning apparition
09 Oct 2085 – Evening apparition
01 Mar 2086 – Morning apparition

Observing Venus

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 phase

Venus's 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 shows an intermediate half phase – called dichotomy – at roughly the same moment that it appears furthest from the Sun, at greatest elongation. The exact times of the two events may differ by a few days, only because Venus's orbit is not quite perfectly aligned with the ecliptic.

Venus's position

The coordinates of Venus when it reaches dichotomy will be:

Object Right Ascension Declination Constellation Angular Size
Venus 02h03m10s 15°19'N Aries 24.4"
Sun 23h14m -04°52' Aquarius 32'13"

The coordinates above are given in J2000.0.

The sky on 23 January 2022
Sunrise
07:21
Sunset
17:19
Twilight ends
18:53
Twilight begins
05:48

21-day old moon
Waning Gibbous

59%

21 days old

Planets
Rise Culm. Set
Mercury 07:06 12:14 17:23
Venus 05:36 10:45 15:54
Moon 22:05 04:27 10:38
Mars 05:14 09:54 14:33
Jupiter 08:58 14:26 19:54
Saturn 08:00 13:05 18:09
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.

Related news

05 Mar 2084  –  Venus at greatest elongation east
15 Mar 2084  –  Venus at highest altitude in evening sky
25 Jul 2084  –  Venus at greatest elongation west
18 Aug 2084  –  Venus at highest altitude in morning sky

Image credit

© NASA/Ricardo Nunes

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39.04°N
77.49°W
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