Venus at dichotomy

Dominic Ford, Editor
From the Inner Planets feed


Objects: Venus

Venus will reach half phase in its 1960–1961 evening apparition. It will be shining brightly at mag -4.4.

From Fairfield , this apparition will be well placed and prominent, reaching a peak altitude of 41° above the horizon at sunset on 14 Feb 1961.

1960–1961 evening apparition of Venus

22 Jun 1960 – Venus at superior solar conjunction
28 Jan 1961 – Venus at greatest elongation east
31 Jan 1961 – Venus at dichotomy
13 Feb 1961 – Venus at highest altitude in evening sky
06 Mar 1961 – Venus at greatest brightness

A graph of the phase of Venus is available here.

Apparitions of Venus

08 Apr 1958 – Morning apparition
23 Jun 1959 – Evening apparition
11 Nov 1959 – Morning apparition
28 Jan 1961 – Evening apparition
19 Jun 1961 – Morning apparition
03 Sep 1962 – Evening apparition
23 Jan 1963 – 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 23h55m10s 0°19'N Pisces 24.8"
Sun 20h58m 17°09'S Capricornus 32'27"

The coordinates above are given in J2000.0.

The sky on 23 Nov 2024

The sky on 23 November 2024
Sunrise
06:48
Sunset
16:27
Twilight ends
18:04
Twilight begins
05:11


Waning Crescent

40%

22 days old

Planets
Rise Culm. Set
Mercury 08:37 13:04 17:30
Venus 10:14 14:41 19:08
Moon 23:20 06:15 12:58
Mars 20:49 04:12 11:35
Jupiter 17:22 00:49 08:16
Saturn 13:05 18:37 00:09
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

28 Jan 1961  –  Venus at greatest elongation east
14 Feb 1961  –  Venus at highest altitude in evening sky
19 Jun 1961  –  Venus at greatest elongation west
08 Aug 1961  –  Venus at highest altitude in morning sky

Image credit

© NASA/Ricardo Nunes

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