Venus at dichotomy

Dominic Ford, Editor
From the Inner Planets feed


Objects: Venus

Venus will reach half phase in its 2199 evening apparition. It will be shining brightly at mag -4.4.

From Cambridge , this apparition will be well placed and prominent, reaching a peak altitude of 42° above the horizon at sunset on 11 Apr 2199.

2199 evening apparition of Venus

02 Sep 2198 – Venus at superior solar conjunction
11 Apr 2199 – Venus at highest altitude in evening sky
14 Apr 2199 – Venus at greatest elongation east
16 Apr 2199 – Venus at dichotomy
18 May 2199 – Venus at greatest brightness
24 Jun 2199 – Venus at inferior solar conjunction

A graph of the phase of Venus is available here.

Apparitions of Venus

23 Jun 2196 – Morning apparition
06 Sep 2197 – Evening apparition
26 Jan 2198 – Morning apparition
14 Apr 2199 – Evening apparition
03 Sep 2199 – Morning apparition
20 Nov 2200 – Evening apparition
11 Apr 2201 – 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 04h29m00s 25°17'N Taurus 23.9"
Sun 01h28m 9°13'N Pisces 31'54"

The coordinates above are given in J2000.0.

The sky on 5 May 2024

The sky on 5 May 2024
Sunrise
05:31
Sunset
19:48
Twilight ends
21:41
Twilight begins
03:39


Waning Crescent

3%

27 days old

Planets
Rise Culm. Set
Mercury 04:43 11:05 17:26
Venus 05:18 12:09 19:00
Moon 04:07 10:27 17:01
Mars 03:59 10:03 16:07
Jupiter 06:05 13:18 20:32
Saturn 03:24 09:02 14:40
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

14 Apr 2199  –  Venus at greatest elongation east
03 Sep 2199  –  Venus at greatest elongation west
16 Sep 2199  –  Venus at highest altitude in morning sky
20 Nov 2200  –  Venus at greatest elongation east

Image credit

© NASA/Ricardo Nunes

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