© NASA/Ricardo Nunes

Venus at greatest brightness

Dominic Ford, Editor
From the Inner Planets feed

Objects: Venus
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Venus will reach its greatest brightness in its 2000–2001 evening apparition. It will be shining brightly at mag -4.6.

From Cambridge , this apparition will be well placed and prominent, reaching a peak altitude of 39° above the horizon at sunset on 6 Feb 2001.

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2000–2001 evening apparition of Venus

17 Jan 2001 – Venus at greatest elongation east
19 Jan 2001 – Venus at dichotomy
06 Feb 2001 – Venus at highest altitude in evening sky
23 Feb 2001 – Venus at greatest brightness

A graph of the brightness of Venus is available here.

Apparitions of Venus

27 Mar 1998 – Morning apparition
11 Jun 1999 – Evening apparition
30 Oct 1999 – Morning apparition
17 Jan 2001 – Evening apparition
07 Jun 2001 – Morning apparition
21 Aug 2002 – Evening apparition
11 Jan 2003 – 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 00h44m40s 10°03'N Pisces 39.7"
Sun 22h26m 9°46'S Aquarius 32'19"

The coordinates above are given in J2000.0.

The sky on 22 Nov 2024

The sky on 22 November 2024
Sunrise
06:41
Sunset
16:16
Twilight ends
17:55
Twilight begins
05:02

21-day old moon
Waning Gibbous

51%

21 days old

Planets
Rise Culm. Set
Mercury 08:36 12:57 17:19
Venus 10:09 14:31 18:53
Moon 22:03 05:23 12:29
Mars 20:40 04:06 11:33
Jupiter 17:14 00:45 08:16
Saturn 13:02 18:32 00:03
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

06 Feb 2001  –  Venus at highest altitude in evening sky
07 Jun 2001  –  Venus at greatest elongation west
04 Aug 2001  –  Venus at highest altitude in morning sky
08 Jun 2002  –  Venus at highest altitude in evening sky

Image credit

© NASA/Ricardo Nunes

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42.38°N
71.11°W
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