Venus at greatest brightness

Dominic Ford, Editor
From the Inner Planets feed


Objects: Venus

Venus will reach its greatest brightness in its 2288 evening apparition. It will be shining brightly at mag -4.7.

From South El Monte , this apparition will not be one of the most prominent but , reaching a peak altitude of 22° above the horizon at sunset on 26 Nov 2288.

2288 evening apparition of Venus

22 Oct 2288 – Venus at dichotomy
23 Oct 2288 – Venus at greatest elongation east
25 Nov 2288 – Venus at highest altitude in evening sky
02 Dec 2288 – Venus at greatest brightness
03 Jan 2289 – Venus at inferior solar conjunction

A graph of the brightness of Venus is available here.

Apparitions of Venus

31 Dec 2285 – Morning apparition
20 Mar 2287 – Evening apparition
09 Aug 2287 – Morning apparition
23 Oct 2288 – Evening apparition
15 Mar 2289 – Morning apparition
30 May 2290 – Evening apparition
18 Oct 2290 – 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 brightness

Venus's brightness depends on two factors: its closeness to the Earth, and its phase. Its 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 reaches its brightest when it is still a crescent – with less than half of its disk illuminated. This is because it is much closer to the Earth during its crescent phases than at other times.

As a result, during evening apparitions, Venus reaches maximum brightness a few days after it is at greatest separation from the Sun, which always coincides with it showing half-phase (dichotomy).

Conversely, during morning apparitions, Venus reaches maximum brightness a few days before it is at greatest separation from the Sun.

Venus's position

The coordinates of Venus when it reaches its greatest brightness will be:

Object Right Ascension Declination Constellation Angular Size
Venus 19h04m20s 25°33'S Sagittarius 43.3"
Sun 16h19m 21°23'S Scorpius 32'25"

The coordinates above are given in J2000.0.

The sky on 25 May 2025

The sky on 25 May 2025
Sunrise
05:41
Sunset
19:53
Twilight ends
21:34
Twilight begins
04:01


Waning Crescent

1%

28 days old

Planets
Rise Culm. Set
Mercury 05:26 12:25 19:24
Venus 03:31 09:49 16:08
Moon 04:19 11:23 18:37
Mars 11:07 17:58 00:49
Jupiter 07:10 14:21 21:31
Saturn 02:43 08:40 14:37
All times shown in PDT.

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

26 Nov 2288  –  Venus at highest altitude in evening sky
14 Feb 2289  –  Venus at highest altitude in morning sky
15 Mar 2289  –  Venus at greatest elongation west
11 May 2290  –  Venus at highest altitude in evening sky

Image credit

© NASA/Ricardo Nunes

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