© 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 2067–2068 evening apparition. It will be shining brightly at mag -4.4.

From Fairfield , this apparition will be exceptionally well placed and prominent, reaching a peak altitude of 43° above the horizon at sunset on 15 Mar 2068.

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2067–2068 evening apparition of Venus

31 Jul 2067 – Venus at superior solar conjunction
09 Mar 2068 – Venus at greatest elongation east
12 Mar 2068 – Venus at dichotomy
15 Mar 2068 – Venus at highest altitude in evening sky
14 Apr 2068 – Venus at greatest brightness
20 May 2068 – Venus at inferior solar conjunction

A graph of the phase of Venus is available here.

Apparitions of Venus

19 May 2065 – Morning apparition
02 Aug 2066 – Evening apparition
22 Dec 2066 – Morning apparition
09 Mar 2068 – Evening apparition
30 Jul 2068 – Morning apparition
14 Oct 2069 – Evening apparition
06 Mar 2070 – 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 02h21m20s 17°03'N Aries 24.3"
Sun 23h32m 2°59'S Pisces 32'11"

The coordinates above are given in J2000.0.

The sky on 17 Apr 2024

The sky on 17 April 2024
Sunrise
06:07
Sunset
19:35
Twilight ends
21:15
Twilight begins
04:27

9-day old moon
Waxing Gibbous

76%

9 days old

Planets
Rise Culm. Set
Mercury 05:43 12:13 18:44
Venus 05:46 12:05 18:24
Moon 13:29 20:53 04:06
Mars 04:47 10:32 16:16
Jupiter 07:15 14:21 21:27
Saturn 04:39 10:15 15:52
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.

Related news

09 Mar 2068  –  Venus at greatest elongation east
15 Mar 2068  –  Venus at highest altitude in evening sky
30 Jul 2068  –  Venus at greatest elongation west
26 Aug 2068  –  Venus at highest altitude in morning sky

Image credit

© NASA/Ricardo Nunes

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Fairfield

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41.14°N
73.26°W
EDT

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