© 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 2181–2182 morning apparition. It will be shining brightly at mag -4.4.

From Fairfield , this apparition will not be one of the most prominent but prominent, reaching a peak altitude of 29° above the horizon at sunrise on 3 Jan 2182.

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2181–2182 morning apparition of Venus

21 Nov 2181 – Venus at inferior solar conjunction
24 Dec 2181 – Venus at greatest brightness
03 Jan 2182 – Venus at highest altitude in morning sky
31 Jan 2182 – Venus at dichotomy
31 Jan 2182 – Venus at greatest elongation west
06 Sep 2182 – Venus at superior solar conjunction

A graph of the phase of Venus is available here.

Apparitions of Venus

07 Feb 2180 – Evening apparition
27 Jun 2180 – Morning apparition
11 Sep 2181 – Evening apparition
31 Jan 2182 – Morning apparition
18 Apr 2183 – Evening apparition
07 Sep 2183 – Morning apparition
24 Nov 2184 – Evening 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 17h27m40s 19°35'S Ophiuchus 24.8"
Sun 20h46m 17°56'S Capricornus 32'28"

The coordinates above are given in J2000.0.

The sky on 25 Nov 2024

The sky on 25 November 2024
Sunrise
06:50
Sunset
16:26
Twilight ends
18:04
Twilight begins
05:13

24-day old moon
Waning Crescent

25%

24 days old

Planets
Rise Culm. Set
Mercury 08:30 12:58 17:26
Venus 10:15 14:43 19:11
Moon 01:23 07:34 13:35
Mars 20:42 04:05 11:28
Jupiter 17:13 00:40 08:07
Saturn 12:57 18:29 00:01
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 Jan 2182  –  Venus at highest altitude in morning sky
31 Jan 2182  –  Venus at greatest elongation west
14 Apr 2183  –  Venus at highest altitude in evening sky
18 Apr 2183  –  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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