© 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 1961 morning apparition. It will be shining brightly at mag -4.3.

From Fairfield , this apparition will not be one of the most prominent but prominent, reaching a peak altitude of 34° above the horizon at sunrise on 8 Aug 1961.

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1961 morning apparition of Venus

10 Apr 1961 – Venus at inferior solar conjunction
13 May 1961 – Venus at greatest brightness
19 Jun 1961 – Venus at greatest elongation west
20 Jun 1961 – Venus at dichotomy
08 Aug 1961 – Venus at highest altitude in morning sky
27 Jan 1962 – Venus at superior solar conjunction

A graph of the phase of Venus is available here.

Apparitions of Venus

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
09 Apr 1964 – 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 02h49m10s 13°13'N Aries 23.5"
Sun 05h58m 23°26'N Taurus 31'28"

The coordinates above are given in J2000.0.

The sky on 28 Jun 2024

The sky on 28 June 2024
Sunrise
05:20
Sunset
20:29
Twilight ends
22:37
Twilight begins
03:12

22-day old moon
Waning Crescent

42%

22 days old

Planets
Rise Culm. Set
Mercury 06:30 14:03 21:35
Venus 05:50 13:23 20:56
Moon 00:24 06:28 12:44
Mars 02:13 09:11 16:09
Jupiter 03:25 10:47 18:08
Saturn 00:06 05:48 11:29
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

19 Jun 1961  –  Venus at greatest elongation west
08 Aug 1961  –  Venus at highest altitude in morning sky
13 Jun 1962  –  Venus at highest altitude in evening sky
03 Sep 1962  –  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
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