Venus at greatest brightness

Dominic Ford, Editor
From the Inner Planets feed


Objects: Venus

Venus will reach its greatest brightness in its 2030 morning apparition. It will be shining brightly at mag -4.7.

From Cambridge , this apparition will not be one of the most prominent but , reaching a peak altitude of 22° above the horizon at sunrise on 14 Feb 2030.

2030 morning apparition of Venus

06 Jan 2030 – Venus at inferior solar conjunction
06 Feb 2030 – Venus at greatest brightness
14 Feb 2030 – Venus at highest altitude in morning sky
18 Mar 2030 – Venus at greatest elongation west
18 Mar 2030 – Venus at dichotomy

The table below lists the altitude of Venus at sunrise over the course of the apparition. All times are given in Cambridge local time.

Date Sun
rises at
Venus
rises at
Altitude
at sunrise
Direction
at sunrise
Mag Phase
15 Jan 203007:0805:5012°south-east-4.33%
25 Jan 203007:0204:5818°south-east-4.611%
04 Feb 203006:5204:2521°south-east-4.620%
14 Feb 203006:4004:0622°south-east-4.629%
24 Feb 203006:2503:5621°south-east-4.636%
06 Mar 203006:0903:5020°south-east-4.543%
16 Mar 203006:5204:4519°south-east-4.449%
26 Mar 203006:3504:4018°south-east-4.354%
05 Apr 203006:1704:3217°south-east-4.258%
15 Apr 203006:0104:2316°south-east-4.262%
25 Apr 203005:4504:1216°east-4.166%
05 May 203005:3104:0116°east-4.170%

A graph of the brightness of Venus is available here.

Apparitions of Venus

21 Mar 2028 – Evening apparition
11 Aug 2028 – Morning apparition
27 Oct 2029 – Evening apparition
18 Mar 2030 – Morning apparition
02 Jun 2031 – Evening apparition
21 Oct 2031 – Morning apparition
07 Jan 2033 – 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 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 18h43m50s 16°51'S Sagittarius 42.7"
Sun 21h21m 15°26'S Capricornus 32'26"

The coordinates above are given in J2000.0.

The sky on 6 Feb 2030

The sky on 6 February 2030
Sunrise
06:50
Sunset
17:03
Twilight ends
18:39
Twilight begins
05:14


Waxing Crescent

24%

4 days old

Planets
Rise Culm. Set
Mercury 05:55 10:33 15:12
Venus 04:21 09:20 14:19
Moon 08:26 14:55 21:34
Mars 08:00 13:35 19:11
Jupiter 01:16 06:11 11:05
Saturn 10:40 17:40 00:40
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

03 Dec 2029  –  Venus at highest altitude in evening sky
14 Feb 2030  –  Venus at highest altitude in morning sky
18 Mar 2030  –  Venus at greatest elongation west
07 May 2031  –  Venus at highest altitude in evening sky

Image credit

© NASA/Ricardo Nunes

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