© NASA/Ricardo Nunes

Venus at dichotomy

Dominic Ford, Editor
From the Inner Planets feed

Objects: Venus
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The sky at

Venus will reach half phase in its 2239 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 3 Apr 2239.

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2239 evening apparition of Venus

23 Aug 2238 – Venus at superior solar conjunction
03 Apr 2239 – Venus at highest altitude in evening sky
03 Apr 2239 – Venus at greatest elongation east
05 Apr 2239 – Venus at dichotomy
08 May 2239 – Venus at greatest brightness
13 Jun 2239 – Venus at inferior solar conjunction

A graph of the phase of Venus is available here.

Apparitions of Venus

12 Jun 2236 – Morning apparition
26 Aug 2237 – Evening apparition
15 Jan 2238 – Morning apparition
03 Apr 2239 – Evening apparition
23 Aug 2239 – Morning apparition
07 Nov 2240 – Evening apparition
29 Mar 2241 – 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 03h40m30s 23°00'N Taurus 24.0"
Sun 00h45m 4°51'N Pisces 32'00"

The coordinates above are given in J2000.0.

The sky on 22 Nov 2024

The sky on 22 November 2024
Sunrise
06:47
Sunset
16:28
Twilight ends
18:05
Twilight begins
05:10

21-day old moon
Waning Crescent

46%

21 days old

Planets
Rise Culm. Set
Mercury 08:40 13:06 17:32
Venus 10:13 14:39 19:06
Moon 22:16 05:32 12:36
Mars 20:52 04:15 11:38
Jupiter 17:26 00:53 08:20
Saturn 13:09 18:41 00:13
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

03 Apr 2239  –  Venus at greatest elongation east
23 Aug 2239  –  Venus at greatest elongation west
10 Sep 2239  –  Venus at highest altitude in morning sky
07 Nov 2240  –  Venus at greatest elongation east

Image credit

© NASA/Ricardo Nunes

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Fairfield

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41.14°N
73.26°W
EST

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