Venus at dichotomy

Dominic Ford, Editor
From the Inner Planets feed


Objects: Venus

Venus will reach half phase in its 1962–1963 morning apparition. It will be shining brightly at mag -4.4.

From Columbus , this apparition will not be one of the most prominent but prominent, reaching a peak altitude of 31° above the horizon at sunrise on 27 Dec 1962.

1962–1963 morning apparition of Venus

12 Nov 1962 – Venus at inferior solar conjunction
16 Dec 1962 – Venus at greatest brightness
27 Dec 1962 – Venus at highest altitude in morning sky
22 Jan 1963 – Venus at dichotomy
23 Jan 1963 – Venus at greatest elongation west
29 Aug 1963 – Venus at superior solar conjunction

A graph of the phase of Venus is available here.

Apparitions of Venus

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
29 Aug 1964 – Morning apparition
15 Nov 1965 – 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 17h00m50s 19°05'S Ophiuchus 24.8"
Sun 20h20m 19°31'S Capricornus 32'29"

The coordinates above are given in J2000.0.

The sky on 23 Nov 2024

The sky on 23 November 2024
Sunrise
07:24
Sunset
17:09
Twilight ends
18:45
Twilight begins
05:48


Waning Crescent

42%

22 days old

Planets
Rise Culm. Set
Mercury 09:12 13:43 18:13
Venus 10:48 15:19 19:50
Moon 00:03 06:55 13:36
Mars 21:31 04:51 12:10
Jupiter 18:04 01:28 08:51
Saturn 13:43 19:16 00:49
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

27 Dec 1962  –  Venus at highest altitude in morning sky
23 Jan 1963  –  Venus at greatest elongation west
07 Apr 1964  –  Venus at highest altitude in evening sky
09 Apr 1964  –  Venus at greatest elongation east

Image credit

© NASA/Ricardo Nunes

Share