© 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 2125 evening apparition. It will be shining brightly at mag -4.4.

From Ashburn , this apparition will not be one of the most prominent but , reaching a peak altitude of 21° above the horizon at sunset on 4 Jul 2125.

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2125 evening apparition of Venus

22 Feb 2125 – Venus at superior solar conjunction
24 Jun 2125 – Venus at highest altitude in evening sky
26 Sep 2125 – Venus at dichotomy
28 Sep 2125 – Venus at greatest elongation east
06 Nov 2125 – Venus at greatest brightness
08 Dec 2125 – Venus at inferior solar conjunction

A graph of the phase of Venus is available here.

Apparitions of Venus

06 Dec 2122 – Morning apparition
23 Feb 2124 – Evening apparition
14 Jul 2124 – Morning apparition
28 Sep 2125 – Evening apparition
17 Feb 2126 – Morning apparition
05 May 2127 – Evening apparition
24 Sep 2127 – 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 15h00m40s 20°23'S Libra 24.2"
Sun 12h07m -00°49' Virgo 31'53"

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

60%

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

24 Jun 2125  –  Venus at highest altitude in evening sky
28 Sep 2125  –  Venus at greatest elongation east
08 Dec 2125  –  Transit of Venus
20 Jan 2126  –  Venus at highest altitude in morning sky

Image credit

© NASA/Ricardo Nunes

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