© 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 2202 evening apparition. It will be shining brightly at mag -4.3.

From Cambridge , this apparition will not be one of the most prominent but prominent, reaching a peak altitude of 34° above the horizon at sunset on 18 May 2202.

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2202 evening apparition of Venus

13 Nov 2201 – Venus at superior solar conjunction
18 May 2202 – Venus at highest altitude in evening sky
24 Jun 2202 – Venus at dichotomy
25 Jun 2202 – Venus at greatest elongation east
31 Jul 2202 – Venus at greatest brightness

A graph of the phase of Venus is available here.

Apparitions of Venus

03 Sep 2199 – Morning apparition
20 Nov 2200 – Evening apparition
11 Apr 2201 – Morning apparition
25 Jun 2202 – Evening apparition
13 Nov 2202 – Morning apparition
31 Jan 2204 – Evening apparition
21 Jun 2204 – 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 09h12m00s 17°59'N Cancer 23.4"
Sun 05h58m 23°24'N Taurus 31'28"

The coordinates above are given in J2000.0.

The sky on 25 Nov 2024

The sky on 25 November 2024
Sunrise
06:45
Sunset
16:14
Twilight ends
17:54
Twilight begins
05:05

24-day old moon
Waning Crescent

20%

24 days old

Planets
Rise Culm. Set
Mercury 08:26 12:49 17:13
Venus 10:11 14:34 18:58
Moon 01:14 07:25 13:26
Mars 20:30 03:57 11:23
Jupiter 17:01 00:31 08:02
Saturn 12:50 18:21 23:51
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

18 May 2202  –  Venus at highest altitude in evening sky
25 Jun 2202  –  Venus at greatest elongation east
05 Nov 2202  –  Venus at highest altitude in morning sky
13 Nov 2202  –  Venus at greatest elongation west

Image credit

© NASA/Ricardo Nunes

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Cambridge

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42.38°N
71.11°W
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